Experiencing a check engine light in your 1995 Honda Civic can be concerning. Understanding what this light means and how to diagnose the issue yourself can save you time and money. While the 1995 Honda Civic is technically OBD1, this guide will walk you through a simple, DIY method to retrieve diagnostic trouble codes (DTCs) without needing a scan tool, often referred to in searches as “OBD2” related queries for this model year range. This process allows you to read the codes directly from your car’s computer, helping you pinpoint potential problems.
Step-by-Step Guide to Reading Check Engine Codes on a 95 Honda Civic
Diagnosing your 1995 Honda Civic’s check engine light is straightforward. You’ll be using the vehicle’s built-in system to flash codes, which you can then interpret using a code list. Here’s how to do it:
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Locate the ECU and Service Connector:
- Head to the passenger side of your Civic.
- Find the kick panel, which is the plastic trim piece on the side of the passenger footwell.
- Gently pull back the carpet in this area.
- You should now see the Engine Control Unit (ECU).
- Above the ECU, you’ll find a small, grey 2-pin connector. This is your service check connector.
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Prepare Your Jumper Wire:
- You’ll need a short piece of thin speaker wire or any similar wire.
- Strip both ends of the wire to expose the bare copper.
- Twist the exposed copper strands at each end to create a stiff point for easy insertion.
-
Connect the Jumper Wire:
- Carefully insert one end of your jumper wire into one of the sockets in the grey 2-pin service connector.
- Insert the other end of the jumper wire into the other socket of the same connector. It doesn’t matter which wire goes into which socket.
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Turn the Ignition ON (Do Not Start the Engine):
- Insert your key into the ignition and turn it to the “ON” position. This is the position just before you would start the engine.
- Do not start the car.
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Observe the Check Engine Light Flashes:
- Watch the check engine light (CEL) on your instrument cluster. It will begin to flash in a pattern.
- Count the flashes. Long flashes represent ’10’, and short, quick flashes represent ‘1’.
For example:
Long flash, short flash, short flash, short flash(!….!!!) is code 13.Long flash, short flash, long flash, short flash, short flash, short flash, short flash(!….!….!!!!!) is code 25.
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Record and Interpret the Codes:
- Write down the codes you observe.
- Use the code list provided below to identify the meaning of each code and the potential issue in your 1995 Honda Civic.
Understanding the Flash Codes
The flashing check engine light communicates diagnostic codes through a simple pattern:
- Long Flash: Equals 10
- Short Flash: Equals 1
To decipher a code, you simply add up the values of the flashes. For instance, if you see two long flashes followed by five short flashes, the code is 25 (10 + 10 + 1 + 1 + 1 + 1 + 1 = 25). Your check engine light might flash multiple codes if there are several issues. It will typically repeat each code sequence a few times before moving to the next code, or repeating the cycle from the beginning if there is only one code.
Honda Civic OBD1 & OBD2 Error Codes
Once you have your flash codes, you can use the following lists to understand what they mean. The first list is for the OBD1 codes read using the flashing method detailed above. The second list provides common OBD2 P-codes, which, while not directly read through the flash method on a ’95 Civic, are helpful for understanding potential issues related to the descriptions provided by the OBD1 codes and for general automotive diagnostic knowledge.
Honda Civic OBD1 Codes (1992-1995):
- 1: O2A – Oxygen sensor #1
- 2: O2B – Oxygen sensor #2
- 3: MAP – Manifold Absolute Pressure Sensor
- 4: CKP – Crank Position Sensor
- 5: MAP – Manifold Absolute Pressure Sensor
- 6: ECT – Water Temperature Sensor (Engine Coolant Temperature)
- 7: TPS – Throttle Position Sensor
- 8: TDC – Top Dead Center Sensor
- 9: CYP – Cylinder Sensor
- 10: IAT – Intake Air Temperature Sensor
- 12: EGR – Exhaust Gas Recirculation Lift Valve
- 13: BARO – Atmospheric Pressure Sensor
- 14: IAC (EACV) – Idle Air Control Valve
- 15: Ignition Output Signal
- 16: Fuel Injectors
- 17: VSS – Vehicle Speed Sensor
- 19: Automatic Transmission Lockup Control Valve
- 20: Electrical Load Detector
- 21: VTEC Spool Solenoid Valve
- 22: VTEC Pressure Valve
- 23: Knock Sensor
- 30: Automatic Transmission A Signal
- 31: Automatic Transmission B Signal
- 36: Traction Control (JDM ECUs)
- 41: Primary Oxygen Sensor Heater
- 43: Fuel Supply System
- 45: Fuel System Too Rich or Lean
- 48: LAF – Lean Air Fuel Sensor
- 54: CKF – Crank Fluctuation Sensor
- 58: TDC Sensor #2
- 61: Primary Oxygen Sensor
- 63: Secondary Oxygen Sensor
- 65: Secondary Oxygen Sensor Heater
- 71: Random Misfire Cylinder 1
- 72: Random Misfire Cylinder 2
- 73: Random Misfire Cylinder 3
- 74: Random Misfire Cylinder 4
Common OBD2 P-Codes (For reference and broader understanding):
- P0010: Variable Valve Timing Control (VTC) Oil Control Solenoid Valve Malfunction
- P0011: Variable Valve Timing Control (VTC) System Malfunction
- P0101: Mass Airflow (MAF) Sensor Range/Performance Problem
- P0102: Mass Airflow (MAF) Sensor Circuit Low Voltage
- P0103: Mass Airflow (MAF) Sensor Circuit High Voltage
- P0106: Manifold Absolute Pressure (MAP) Sensor Range/Performance Problem
- P0107: Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
- P0108: Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
- P0111: Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem
- P0112: Intake Air Temperature (IAT) Sensor Circuit Low Voltage
- P0113: Intake Air Temperature (IAT) Sensor Circuit High Voltage
- P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem
- P0117: Engine Coolant Temperature (ECT) Sensor Circuit Low Input
- P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Input
- P0122: Throttle Position (TP) Sensor Circuit Low Input
- P0123: Throttle Position (TP) Sensor Circuit High Input
- P0125: Engine Coolant Temperature (ECT) Sensor Slow Response
- P0128: Cooling System Malfunction
- P0131: Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage
- P0132: Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit High Voltage
- P0133: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Circuit Slow Response
- P0134: Air/Fuel Ratio (A/F) Sensor (Sensor 1) No Activity Detected
- P0135: Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction
- P0137: Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Low Voltage
- P0138: Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit High Voltage
- P0139: Secondary Heated Oxygen Sensor (Secondary HO2S) Slow Response
- P0141: Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction
- P0143: Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Low Voltage
- P0144: Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit High Voltage
- P0145: Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Slow Response
- P0147: Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Heater Circuit Malfunction
- P0153: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Circuit Slow Response
- P0154: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction
- P0155: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction
- P0157: Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Low Voltage
- P0158: Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit High Voltage
- P0159: Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Slow Response
- P0161: Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Heater Circuit Malfunction
- P0171: Fuel System Too Lean
- P0172: Fuel System Too Rich
- P0174: Front Bank (Bank 2) Fuel System Too Lean
- P0175: Front Bank (Bank 2) Fuel System Too Rich
- P0191: Fuel Pressure Sensor Range/Performance Problem
- P0192: Fuel Pressure Sensor Circuit Low Voltage
- P0193: Fuel Pressure Sensor Circuit High Voltage
- P0196: EOT Sensor/Range Performance Problem
- P0197: EOT Sensor Circuit Low Voltage
- P0198: EOT Sensor Circuit High Voltage
- P0222: Throttle Position (TP) Sensor 2 Circuit Low Voltage
- P0223: Throttle Position (TP) Sensor 2 Circuit High Voltage
- P0300: Random Misfire
- P0301: No. 1 Cylinder Misfire
- P0302: No. 2 Cylinder Misfire
- P0303: No. 3 Cylinder Misfire
- P0304: No. 4 Cylinder Misfire
- P0305: No. 5 Cylinder Misfire
- P0306: No. 6 Cylinder Misfire
- P0325: Knock Sensor Circuit Malfunction
- P0335: Crankshaft Position (CKP) Sensor Circuit No Signal
- P0336 P0339: Crankshaft Position (CKP) Sensor Circuit Intermittent Interruption
- P0340: Camshaft Position (CMP) Sensor No Signal
- P0341: Camshaft Position (CMP) Sensor A Intermittent Interruption
- P0341: Variable Valve Timing Control (VTC) Phase Gap
- P0344: Camshaft Position (CMP) Sensor Intermittent Interruption
- P0365: Camshaft Position (CMP) Sensor B No Signal
- P0366 P0369: Camshaft Position (CMP) Sensor B Intermittent Interruption
- P0385: Crankshaft Position (CKP) Sensor B No Signal
- P0389: Crankshaft Position (CKP) Sensor B Intermittent Interruption
- P0401: Exhaust Gas Recirculation (EGR) Insufficient Flow
- P0404: Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Problem
- P0406: Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage
- P0410: Air Pump Circuit Malfunction
- P0411: Secondary Air Injection System Incorrect Flow
- P0420: Catalyst System Efficiency Below Threshold
- P0430: Front Bank Catalyst System Efficiency Below Threshold (Bank 2)
- P0441: Evaporative Emission (EVAP) Control System Incorrect Purge Flow
- P0442: Evaporative Emission (EVAP) System Small Leak Detected
- P0443: Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction
- P0451: Fuel Tank Pressure (FTP) Sensor Range/Performance Problem
- P0452: Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
- P0453: Fuel Tank Pressure (FTP) Sensor Circuit High Voltage
- P0456: Evaporative Emission (EVAP) System Very Small Leak Detected
- P0457: Evaporative Emission (EVAP) System Leak Detected Fuel Fill Cap Loose/Off
- P0461: Fuel Gauge Sending Unit Range/Performance Problem
- P0462: Fuel Gauge Sending Unit Circuit Low Voltage
- P0463: Fuel Gauge Sending Unit Circuit High Voltage
- P0496: Evaporative Emission (EVAP) System High Purge Flow
- P0497: Evaporative Emission (EVAP) System Low Purge Flow
- P0498: Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit Low Voltage
- P0499: Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit High Voltage
- P0500: Vehicle Speed Sensor (VSS) Circuit Malfunction
- P0501: Vehicle Speed Sensor (VSS) Range/Peformance Problem
- P0505: Idle Control System Malfunction
- P0506: Idle Control System RPM Lower Than Expected
- P0507: Idle Control System RPM Higher Than Expected
- P0511: Idle Air Control (IAC) Valve Circuit Malfunction
- P0521: EOP Sensor Range/Performance Problem
- P0522: EOP Sensor Circuit Low Voltage
- P0523: EOP Sensor Circuit High Voltage
- P0560: ECM Back-up Circuit Low Voltage
- P0563: Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage
- P0600: Multiplex Control System Troubleshooting
- P0603: ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error
- P0606: ECM/PCM Processor Malfunction
- P0661: Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit Low Voltage
- P0662: Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit High Voltage
- P0685: ECM/PCM Power Relay Control Circuit Malfunction
- P0700: Automatic Transmission Control System
- P0705: Short in Transmission Range Switch Circuit (Multiple Shift-position Input)
- P0706: Open in Transmission Range Switch Circuit
- P0710 P0711: Problem in ATF Temperature Sensor Circuit
- P0712: Short in ATF Temperature Sensor Circuit
- P0713: Open in ATF Temperature Sensor Circuit
- P0715 P0716: Problem in Mainshaft Speed Sensor Circuit
- P0717: Problem in Mainshaft Speed Sensor Circuit (No Signal Input)
- P0718: Mainshaft Speed Sensor Intermittent Failure
- P0720: Countershaft Speed Sensor Circuit Malfunction
- P0720 P0721: Problem in Countershaft Speed Sensor Circuit
- P0722: Problem in Countershaft Speed Sensor Circuit (No Signal Input)
- P0723: Countershaft Speed Sensor Intermittent Failure
- P0725: Engine Speed Input Circuit Malfunction
- P0730: Problem in Shift Control System
- P0731: Problem in 1st Clutch and 1st Clutch Hydraulic Circuit
- P0732: Problem in 2nd Clutch and 2nd Clutch Hydraulic Circuit
- P0733: Problem in 3rd Clutch and 3rd Clutch Hydraulic Circuit
- P0734: Problem in 4th Clutch and 4th Clutch Hydraulic Clutch
- P0735: Problem in 5th Clutch and 5th Clutch Hydraulic Circuit
- P0740: Problem in Lock-up Control System
- P0741: Torque Converter Clutch Hydraulic Clutch Stuck OFF
- P0743: Problem in Torque Converter Clutch Solenoid Valve Circuit
- P0745: Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0746: A/T Clutch Pressure Control Solenoid Valve A Stuck OFF
- P0747: A/T Clutch Pressure Control Solenoid Valve A Stuck ON
- P0748: Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0750: Problem in Hydraulic Control System of Shift Solenoid Valve A Circuit
- P0751: Shift Solenoid Valve A Stuck OFF
- P0752: Shift Solenoid Valve A Stuck ON
- P0753: Problem in Shift Solenoid Valve A Circuit
- P0756: Shift Solenoid Valve B Stuck OFF
- P0757: Shift Solenoid Valve B Stuck ON
- P0758: Problem in Shift Solenoid Valve B Circuit
- P0761: Shift Solenoid Valve C Stuck OFF
- P0762: Shift Solenoid Valve C Stuck ON
- P0763: Problem in Shift Solenoid Valve C Circuit
- P0771: Shift Solenoid Valve E Stuck OFF
- P0773: Problem in Shift Solenoid Valve E Circuit
- P0775: Problem in the Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0776: A/T Clutch Pressure Control Solenoid Valve B Stuck OFF
- P0777: A/T Clutch Pressure Control Solenoid Valve B Stuck ON
- P0778: Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0780: Problem in Shift Control System
- P0795: Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve C Circuit
- P0796: A/T Clutch Pressure Control Solenoid Valve C Stuck OFF
- P0797: A/T Clutch Pressure Control Solenoid Valve C Stuck ON
- P0798: Problem in A/T Clutch Pressure Control Solenoid Valve C Ciruit
- P0812: Open in Transmission Range Switch ATP RVS Switch Circuit
- P0842: Short in 2nd Clutch Transmission Fluid Pressure Switch Clutch, or 2nd Clutch Transmission Fluid Pressure Switch (Clutch) Stuck ON
- P0843: Open in 2nd Clutch Transmission Fluid Pressure Switch Circuit, or 2nd Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0845: Problem in 3rd Clutch Pressure Switch Circuit
- P0847: Short in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck ON
- P0848: Open in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0872: Short in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck ON
- P0873: Open in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0962: Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0963: Problem in A/T Clutch Pressure Control Solenoid Valve A
- P0966: Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0967: Problem in A/T Clutch Pressure Control Solenoid Valve B
- P0970: Problem in A/T Clutch Pressure Control Solenoid Valve C Circuit
- P0971: Problem in A/T Clutch Pressure Control Solenoid Valve C
- P0973: Short in Shift Solenoid Valve A Circuit
- P0974: Open in Shift Solenoid Valve A Circuit
- P0976: Short in Shift Solenoid Valve B Circuit
- P0977: Open in Shift Solenoid Valve B Circuit
- P0979: Short in Shift Solenoid Valve C Circuit
- P0980: Open in Shift Solenoid Valve C Circuit
- P0982: Short in Shift Solenoid Valve D Circuit
- P0983: Open in Shift Solenoid Valve D Circuit
- P0985: Short in Shift Solenoid Valve E Circuit
- P0986: Open in Shift Solenoid Valve E Circuit
- P1020: Valve Pause System Stuck Off
- P1021: Valve Pause System Stuck On
- P1025: Valve Pause System Sticking Off
- P1026: Valve Pause System Sticking On
- P1077: Intake Manifold Runner Control (IMRC) System Malfunction (Low rpm)
- P1078: Intake Mainfold Runner Control (IMRC) System Malfunction (High rpm)
- P1106: Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
- P1107: Barometric Pressure (BARO) Sensor Circuit Low Voltage
- P1108: Barometric Pressure (BARO) Sensor Circuit High Voltage
- P1121: Throttle Position (TP) Sensor Lower Than Expected
- P1122: Throttle Position (TP) Sensor Higher Than Expected
- P1128: Manifold Absolute Pressure (MAP) Sensor Circuit Lower Than Expected
- P1129: Manifold Absolute Pressure (MAP) Sensor Circuit Higher Than Expected
- P1130: Demand for Changing Both Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) and Third Heated Oxygen Sensor (Third HO2S) (Sensor 3)
- P1149: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1149: Air/Fuel Ratio Sensor (Sensor 1) Circuit Lean Range
- P1157: Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS Line High Voltage
- P1157: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Circuit High Voltage
- P1157: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1158: Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Terminal Low Voltage
- P1159: Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Terminal Low Voltage
- P1162: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response
- P1163: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response
- P1163: Air/Fuel Ratio Sensor (Sensor 1) Slow Response
- P1164: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1164: Air/Fuel Ratio (AF) Sensor (Sensor 1) Circuit Range/Performance
- P1165: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1165: Air/Fuel Ratio Sensor (Sensor 1) Circuit Range/Performance
- P1166: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical Problem
- P1166: Heated Oxgen Sensor Sensor1 (Primary HO2S) Heater Circuit Malfunction
- P1167: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Malfunction
- P1167: Heated Oxygen Sensor Sensor1 (Primary LAF HO2S) Heater System Malfunction
- P1168: Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL Low Voltage
- P1169: Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL High Voltage
- P1182: Fuel Temperature Sensor Circuit Low Voltage
- P1183: Fuel Temperature Sensor Circuit High Voltage
- P1253 P1259: VTEC System Malfunction
- P1297: Electric Load Detector (ELD) Circuit Low Voltage
- P1298: Electric Load Detector (ELD) Circuit High Voltage
- P1300: Random Misfire
- P1324: Knock Sensor Power Source Circuit Low Voltage
- P1336: Engine Speed (RPM) Fluctuation Sensor Intermittent Interruption
- P1337: Engine Speed (RPM) Fluctuation Sensor No Signal
- P1355: Front Ignition Coil Power Circuit Malfunction
- P1359: Crankshaft Position (CKP)/Top Dead Center (TDC) Sensor Circuit Malfunction
- P1361: Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) Intermittent Interruption
- P1361: Top Dead Center (TDC) Sensor Intermittent Interruption
- P1362: Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) No Signal
- P1362: Top Dead Center (TDC) Sensor No Signal
- P1366: Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) Intermittent Interruption
- P1366: Top Dead Center (TDC) Sensor 2 Intermittent Interruption
- P1367: Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) No Signal
- P1367: Top Dear Center (TDC) Sensor 2 No Signal
- P1381: Cylinder Position (CYP) Sensor Intermittent Interruption
- P1382: Cylinder Position (CYP) Sensor No Signal
- P1410: Air Pump Malfunction
- P1415: Air Pump Electric Current Sensor Circuit Low Voltage
- P1416: Air Pump Electric Current Sensor Circuit High Voltage
- P1420: Nox Adsorptive Catalyst System Efficiency Below Threshold
- P1438: Motor Drive Module (MDM) Overheating Signal Circuit
- P1438: Motor Drive Module (MDM) Overheating
- P1439: Motor Drive Module (MDM) Short Circuit Sensor Problem
- P1439: Motor Drive Module (MDM) Short Circuit
- P1440: IMA System Problem
- P1445: Bypass Control Problem
- P1448 P1449: Battery Module Overheating
- P1449: Battery Cell Overheating
- P1449: Battery Module Individual Voltage Input Deviation
- P1449: Battery Module Deterioration
- P1449: Battery Module Deviation
- P1454: Fuel Tank Pressure (FTP) Sensor Range/Performance Problem
- P1456: Evaporative Emissions (EVAP) Control System Leakage (Fuel Tank System)
- P1457: Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System)
- P1459: Evaporative Emission (EVAP) Purge Flow Switch Malfunction
- P1491: Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
- P1486: Cooling System Malfunction
- P1491: Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
- P1498: Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage
- P1505: Positive Crankcase Ventilation (PCV) Air Leakage
- P1508 P1519: Idle Air Control Valve (IACV) Circuit Malfunction
- P1509: Idle Air Control Valve (IACV) Circuit Failure
- P1522: Brake Booster Pressure Sensor Circuit Low Voltage
- P1523: Brake Booster Pressure Sensor Circuit High Voltage
- P1524: Brake Booster Pressure Sensor Range/Performance Problem
- P1541: Climate Control Unit Signal Circuit Low Voltage
- P1542: Climate Control Unit Signal Circuit High Voltage
- P1565: Motor Commutation Signal Problem
- P1568: Battery Module Individual Voltage Input Problem
- P1568: Battery Module Temperature Signal Circuit Problem
- P1568: Battery Cell Temperature Signal Circuit Problem
- P1572: Motor Drive Module (MDM) Temperature Signal Circuit Low Input
- P1572: Motor Drive Module (MDM) Temperature Signal Circuit High Input
- P1576: Motor Drive Module (MDM) Voltge Signal Circuit Low Input
- P1577: High Voltage Detection Signal Circuit Problem
- P1580: Battery Current Circuit Problem
- P1581: Motor Power Inverter (MPI) Module Current Signal Circuit Low Input
- P1581: Motor Power Inverter (MPI) Module Current Signal Circuit High Input
- P1581: Motor Power Inverter (MPI) Module Current Signal Circuit Problem
- P1582: Motor Current U Phase Signal Circuit Low Input
- P1582: Motor Current U Phase Signal Circuit High Input
- P1583: Motor Current V Phase Signal Circuit Low Input
- P1583: Motor Current V Phase Signal Circuit High Input
- P1584: Motor Current W Phase Signal Circuit Low Input
- P1584: Motor Current W Phase Signal Circuit High Input
- P1585: Motor Current Signal Circuit Problem
- P1586: Motor Power Inverter (MPI) Module Current Signal/Battery Current Signal Circuit Problem
- P1607: Engine Control Module (ECM)/Powertrain Control Module (PCM) Internal Circuit Malfunction
- P1630: Transmission Control Module
- P1635: Battery Condition Monitor (BCM) Module Proble
- P1639: MOTB Signal Circuit Malfunction
- P1640: ACTTRQ Motor Torque Signal Circuit Low Input
- P1641: ACTTRQ Motor Torque Signal Circuit High Input
- P1642: QBATT Battery Signal Circuit Low Input
- P1643: QBATT Battery Signal Circuit High Input
- P1644: MOTFSA Signal Malfunction
- P1645: MOTFSB Signal Malfunction
- P1646: MOTSTB Signal Malfunction
- P1647: Power Command Signal Circuit Low Input
- P1647: Power Command Signal Circuit High Input
- P1647: Engine Torque Signal Circuit Low Input
- P1647: Engine Torque Signal Circuit High Input
- P1647: Mode Signal Circuit 1 Low Input
- P1647: Mode Signal Circuit 1 High Input
- P1647: Mode Signal Circuit 2 Problem
- P1647: Engine Speed Signal Circuit Problem
- P1648: Battery Condition Monitor (BCM) Module Communication Signal Circuit Problem
- P1648: Motor Control Module (MCM) Communication Signal Circuit Problem
- P1655: CVT-FI TMA/TMB Signal Line Failure
- P1656: Problem in PCM-toVTM-4 Control Unit Communications Circuit
- P1660: A/T-FI Data Line Failure/TCM – ECM Halt
- P1676 P1678: FPTDR Signal Line Failure
- P1679: RSCD Signal Circuit Malfunction
- P1681: A/T FI Signal A Cicuit Low Voltage
- P1682: A/T FI Signal A Circuit High Voltage
- P1683: Throttle Valve Default Position Spring Performance Problem
- P1684: Throttle Valve Return Spring Performance Problem
- P1686: A/T FI Signal B Circuit Low Voltage
- P1687: A/T FI Signal B Circuit High Voltage
- P1705: Short in Transmission Range Switch Circuit (More than one range position is on at the same time)
- P1706: Open in Transmission Range Switch Circuit
- P1709: Problem Transmission Gear Selection Switch Circuit
- P1730: Problem in Shift Control System: Shift Solenoid Valve A and D Stuck OFF Shift Solenoid Valve B Stuck ON Shift Valves A, B, and D Stuck
- P1731: Problem in Shift Control System: Shift Solenoid Valve E Stuck ON Shift Valve E Stuck A/T Clutch Pressure Control Solenoid Valve A Stuck OFF
- P1732: Problem in Shift Control System: Shift Solenoid Valve B and C Stuck ON Shift Valves B and C Stuck
- P1733: Problem in Shift Control System: Shift Solenoid Valve D Stuck ON Shift Valve D Stuck A/T Clutch Pressure Control Solenoid Valve C Stuck OFF
- P1734: Problem in Shift Control System: Shift Solenoid Valves B and C Stuck ON Shift Valves B and C Stuck
- P1738: Problem in 2nd Clutch Pressure Switch Circuit
- P1739: Problem in 3rd Clutch Pressure Switch Circuit
- P1740: Problem in 4th Clutch Pressure Switch Circuit
- P1750: Mechanical Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve Assemblies A and B, or Problem in the Hydraulic Control System
- P1751: Mechanical Problem in Hydraulic Control System of Shift Solenoid Valve B and A/T Clutch Pressure Control Solenoid Valves A and B, or Problem in the Hydraulic Control System
- P1753: Problem in Torque Converter Clutch Solenoid Valve Circuit
- P1751 P1768: Problem in Torque Converter Clutch Solenoid Valve B Circuit
- P1773: Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P1790: Throttle Position (TP) Sensor Circuit Malfunction
- P1791: Vehicle Speed Sensor (VSS) Range/Performance Problem
- P1792: Problem in Engine Coolant Temperature (ECT) Sensor Circuit
- P1793: Manifold Absolute Pressure Sensor Circuit
- P1870: Problem in CVT Speed Change Control Valve Assembly Circuit
- P1873: Problem in CVT Pulley Pressure Control Valve Assembly Circuit
- P1879: Problem in CVT Start Clutch Pressure Control Valve Assembly Circuit
- P1882: Problem in Inhibitor Solenoid Circuit
- P1884: Secondary Gear Speed Sensor 2 Circuit Malfunction
- P1885: CVT Drive Pulley Speed Sensor Circuit
- P1886: CVT Driven Pulley Speed Sensor Circuit
- P1888: CVT Speed Sensor
- P1889: Problem in CVT Speed Sensor 2 Circuit
- P1890: Shift Control System
- P1891: Problem in Start Clutch System
- P1894: CVT Speed Change Control Valve Circuit
- P1895: CVT Pulley Pressure Control Valve Circuit
- P2101: Throttle Actuator System Malfunction
- P2108: Throttle Actuator Control Module Problem
- P2118: Throttle Actuator Current Range/Performance Problem
- P2122: Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit Low Voltage
- P2123: Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit High Voltage
- P2127: Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit Low Voltage
- P2128: Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit High Voltage
- P2135: Throttle Position (TP) Sensor 1/2 Incorrect Voltage Correlation
- P2138: Accelerator Pedal Position (APP) Sensor 1/2 (Throttle Position Sensor D/E) Incorrect Voltage Correlation
- P2176: Throttle Actuator Control System Idle Position Not Learned
- P2195: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Signal Stuck Lean
- P2197: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Signal Stuck Lean
- P2227: Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
- P2228: Barometric Pressure (BARO) Sensor Circuit Low Voltage
- P2229: Barometric Pressure (BARO) Sensor Circuit High Voltage
- P2237: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line High Voltage
- P2238: Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Line Low Voltage
- P2238: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line Low Voltage
- P2240: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line High Voltage
- P2241: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line Low Voltage
- P2243: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line High Voltage
- P2245: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line Low Voltage
- P2247: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line High Voltage
- P2249: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line Low Voltage
- P2251: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line High Voltage
- P2252: Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Line Low Voltage
- P2254: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line High Voltage
- P2255: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line Low Voltage
- P2279: Intake Air System Leak
- P2413: Exhaust Gas Recirculation (EGR) System Range/Performance Problem
- P2422: Evaporative Emission (EVAP) System Vent Shut Valve Close Malfunction
- P2552: Throttle Actuator Control Module Relay Malfunction
- P2627: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage
- P2628: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage
- P2630: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage
- P2631: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage
- P2646: VTEC Oil Pressure Switch Circuit Low Voltage
- P2647: VTEC Oil Pressure Switch Circuit High Voltage
- P2648: VTEC Solenoid Valve Circuit Low Voltage
- P2649: VTEC Solenoid Valve Circuit High Voltage
- P2769: Short in Torque Converter Clutch Solenoid Valve Circuit
- P2770: Open in Torque Converter Clutch Solenoid Valve Circuit
- P2A00: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P2A03: Front A/F Sensor Circuit (Bank 2, Sensor 1) Circuit Range/Performance Problem
- U0073: FCAN Malfunction (Bus-off)
- U0107: Lost Communication With Throttle Actuator Control Module
- U0121: FCAN Malfunction (TCS-PCM)
- U0155: FCAN Malfunction (Gauge Control Module-ECM/PCM)
For more in-depth electrical diagnostics, refer to these ECU wiring diagrams:
Diagram of 92-95 Honda Civic ECU Wiring for detailed electrical troubleshooting.
Illustration of OBD1 Shock Tower Plug for 1992-1995 Honda Civic models.
Image showing an OBD1 pin removal tool, useful for connector maintenance and repair.
Key for Wiring Diagram:
-
(Wire color), (Function/Description (if need be)), (Voltage Value (DC Volts Unless otherwise specified) V = Volts Wht = White Blk = Black Grn = Green Yel = Yellow Brn = Brown Blu = Blue Org = Orange
-
KOEO = Key on; Engine OFF
-
KOER = Key on; Engine Running
(Note: While the lists include both OBD1 and OBD2 codes for broader information, your 1995 Honda Civic, when using this flash code method, reads out OBD1 codes.)
Common Check Engine Codes and Troubleshooting for 95 Honda Civic
After retrieving your check engine codes, you might find some common culprits for a 1995 Honda Civic. Codes related to the Oxygen Sensor (O2 sensor – codes 1, 2, 41, 61, 63, 65, and related P-codes) are frequent due to sensor age or exhaust system issues. Similarly, codes for the MAP sensor (codes 3, 5, and related P-codes), ECT sensor (code 6 and related P-codes), and TPS sensor (code 7 and related P-codes) can indicate sensor malfunctions or wiring problems.
If you encounter codes related to misfires (codes 71-74, P0300-P0304), check spark plugs, wires, distributor cap, and rotor. Fuel system codes (codes 43, 45, and related P-codes) might point to fuel pump, fuel filter, or injector problems.
Important Considerations:
- Accuracy: Ensure you accurately count the flashes to get the correct code.
- Multiple Codes: Address codes in the order they appear, as one issue might trigger others.
- Resetting the Light: After repairs, the check engine light may need to be reset. Disconnecting the negative battery terminal for a few minutes can often clear the codes, but ensure you’ve properly fixed the underlying issue.
- Professional Help: If you are unsure about diagnosing or repairing the issue, always consult a qualified mechanic.
By following these steps, you can effectively diagnose the check engine light on your 1995 Honda Civic and take informed steps towards resolving any problems. This DIY method is a valuable tool for any Civic owner looking to understand their vehicle better and perform basic diagnostics.
