Understanding the diagnostic trouble codes (DTCs) in your 1995 Jeep Wrangler is crucial for maintaining its performance and longevity. While 1995 was a transition year for many vehicles towards OBD2, it’s essential to know how to retrieve and interpret these codes specifically for your Wrangler. This guide provides a detailed breakdown of OBD codes applicable to 1995 Jeep Wranglers, helping you diagnose issues and keep your off-road legend running smoothly.
Retrieving OBD1 & OBD2 Codes on Your 1995 Jeep Wrangler
Even though the term “1995 Jeep Wrangler Obd2” is the target keyword, it’s important to clarify that 1995 Jeep Wranglers primarily used OBD1 systems. However, the procedure outlined below is often referenced for accessing diagnostic information on these models, sometimes incorrectly associated with OBD2 retrieval methods. This method allows you to read trouble codes using the Check Engine Light (MIL) flashes:
- Ignition Key Position: Insert your key into the ignition switch.
- On-Off Cycle: Turn the ignition from “Off” to “On,” then back to “Off,” and then “On” again, within a 5-second timeframe. The sequence is On-Off-On-Off-On.
- Observe MIL Flashes: Carefully watch the Malfunction Indicator Lamp (MIL), commonly known as the Check Engine Light. It will begin to flash a series of codes.
- Decoding the 2-Digit DTCs: The codes are two-digit numbers. For example, DTC 24 is indicated by two flashes, a short pause, followed by four flashes.
- Multiple Codes: If there are multiple stored trouble codes, you’ll notice a longer pause between each code sequence.
- Code 55 – End of Transmission: The code sequence will end with code 55, signaling the completion of the diagnostic code display.
1995 Jeep Wrangler OBD Code Definitions
Here’s a comprehensive list of OBD codes that may be displayed by your 1995 Jeep Wrangler. Understanding these codes is the first step in diagnosing and repairing issues. Remember to consult your Jeep Wrangler service manual for detailed troubleshooting steps and always prioritize safety when working on your vehicle.
| Code | Description |
|---|---|
| 11 | No crank reference signal detected during engine cranking. Intermittent loss of either camshaft or crankshaft position sensor. |
| 12 | Positive battery input to PCM was disconnected within the last 50 Key-on cycles. |
| 13 | No difference recognized between the engine MAP reading and the barometric (atmosphere) pressure reading from start-up. |
| 14 | MAP sensor input above or below acceptable voltage. 5 volt output to MAP sensor open. |
| 15 | No vehicle speed sensor signal detected during driving load conditions. |
| 17 | Engine did not reach operating temperature within acceptable limits. |
| 21 | Upstream oxygen sensor response slower than minimum required switching frequency. Upstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor input voltage maintained above the normal operating range. Oxygen sensor voltage too low, tested after cold start. (Upstream or Downstream) Left oxygen sensor input voltage maintained above the normal operating temperature. |
| 22 | Engine coolant temperature sensor above or below acceptable voltage. |
| 23 | Intake air temperature sensor input above or below acceptable voltage. |
| 24 | Throttle position sensor input above or below acceptable voltage. TPS signal does not correlate to MAP sensor. |
| 25 | A shorted or open condition detected in one or more of the idle air control motor circuits. Actual idle speed does not equal target idle speed. |
| 27 | Injector #1 thru 6, or any combination of individual injectors driver does not respond properly to the control signal. |
| 31 | An open or shorted condition detected in the A/C clutch relay circuit. Insufficient or excessive vapor flow detected during fuel evaporation emission system operation. |
| 33 | An open or shorted condition detected in the duty cycle purge solenoid circuit. (A/C clutch relay circuit) |
| 34 | An open or shorted condition detected in the Speed Control vacuum or vent solenoid circuits. Speed control switch input below the minimum acceptable voltage. |
| 37 | Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement. An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit. Incorrect input state detected for the Park/Neutral switch. Auto only. |
| 41 | An open or shorted condition in the generator field control circuit. |
| 42 | An open or shorted condition detected in the auto shutdown relay circuit. An open condition detected in the ASD relay output circuit. An open or shorted condition detected in the fuel pump relay control circuit. An open circuit between PCM and fuel gauge sending unit. Circuit shorted to voltage between PCM and fuel gauge sending unit. No movement of fuel level sender detected. |
| 43 | Peak primary circuit current not achieved with maximum dwell time. Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.) |
| 44 | Battery temperature sensor in voltage above or below acceptable range. |
| 46 | Battery voltage sense input above target charging voltage during engine operation. |
| 47 | Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit. |
| 51 | A lean air/fuel mixture has been indicated by an abnormally rich correction factor. |
| 52 | A rich air/fuel mixture has been indicated by an abnormally rich correction factor. |
| 53 | PCM Internal fault condition detected. |
| 54 | No camshaft signal detected during engine cranking. |
| 55 | Completion of fault code display on Check Engine lamp. |
| 62 | PCM Failure to update service reminder indicator. |
| 63 | Unsuccessful attempt to write to an EEPROM location by the PCM. |
| 64 | Catalyst efficiency below required level. (Same as code 72) |
| 65 | Power steering high pressure seen at high speed. (2.5L only) |
| 72 | Catalyst efficiency below required level. (Same as code 64) |
| 77 | Malfunction detected with power feed to speed control servo solenoids. |
Understanding OBD1 vs. OBD2 in 1995 Wranglers
It’s important to reiterate that while OBD2 became more prevalent in 1996, the 1995 Jeep Wrangler typically utilizes an OBD1 system. The method described to retrieve codes is characteristic of OBD1 systems, relying on flashing lights rather than a dedicated OBD2 scanner and port. Incorrectly searching for “1995 jeep wrangler obd2” information might lead to confusion. Always verify your vehicle’s specifications and consult repair manuals specific to the 1995 Jeep Wrangler for accurate diagnostic procedures.
Conclusion: Empowering Your 1995 Jeep Wrangler Diagnostics
This guide equips you with the knowledge to retrieve and understand the diagnostic trouble codes on your 1995 Jeep Wrangler. By using the key-cycling method and referencing the code list, you can gain valuable insights into potential issues. Remember that while these codes point you in the right direction, professional diagnosis and repair are always recommended for complex problems. Keeping your 1995 Jeep Wrangler running optimally requires understanding its systems, and decoding these diagnostic codes is a vital step in that process.
