Upgrading your 1G DSM (Diamond Star Motors) to OBD2 compatibility using a 2G ECU can unlock enhanced diagnostic capabilities and tuning options. This conversion, while intricate, is achievable with careful planning and execution. This guide provides a detailed walkthrough of the 2g Dsm Obd2 Pinout and the steps necessary to integrate a 2G ECU into your 1G DSM.
Tools and Materials You’ll Need
Before starting, gather these essential tools and materials:
- Soldering Gun (with solder sucker or wick)
- Shrink Wrap Tubing
- Wire Strippers
- Assortment of Wiring
- Spare 1G ECU (a non-working or fried ECU is ideal for practice)
- 2G Interior Harness and Engine Harness
- OBD2 Port (if not included in the harness)
- Patience and attention to detail
Step-by-Step Guide to 2G ECU Conversion
Preparation and Pinout Review
Crucially, before you begin any physical modifications, thoroughly review the 1G and 2G DSM ECU pinouts. Understanding the differences and similarities is paramount to a successful conversion. Incorrect wiring can lead to ECU damage or vehicle malfunction. Familiarize yourself with the 2g DSM OBD2 pinout diagrams and how they correspond to the 1G pinout.
ECU Plug Modification
-
Desolder the 1G ECU Plug: Take your spare 1G ECU and carefully desolder the connector plug from the circuit board. Aim to preserve as much of the connector pins as possible for better soldering contact later. Patience is key during this step to avoid damaging the connector.
-
Prepare the 2G Harness Plugs: Obtain your 2G engine harness and carefully cut off the ECU plugs, leaving approximately 6-8 inches of wire attached to the plugs. Next, from your 2G interior harness, cut off the OBD2 port, again leaving a workable length of wire.
Wiring the 2G Harness to the 1G Pinout
This is the most critical step, requiring meticulous attention to the 2g DSM OBD2 pinout.
-
Consult the Pinout Diagrams: Refer to the provided 2G pinout diagrams, which highlight the 1G pinout equivalents in red. Always double-check the orientation of the pinouts in the diagrams to avoid mirroring the connections.
This image displays the first part of the 2G DSM ECU pinouts diagram, with corresponding 1G pin assignments marked in red for clear comparison during the wiring process.
This image continues the 2G DSM ECU pinout diagram, completing the pin assignments and their 1G counterparts, essential for accurate wiring.
-
Solder Wire by Wire: Begin stripping wires one at a time from the 2G plugs and solder them to the corresponding pins on the 1G connector you desoldered earlier. Crucially, slide shrink wrap tubing onto each wire before soldering the connection. This will allow you to insulate each connection afterward, preventing shorts. Note that wire colors may not match between harnesses, so focus strictly on the pinout locations, not wire color codes.
Tip: Employ the tinning method for soldering. Tin both the wire and the 1G connector pin with solder separately, let them cool slightly, and then solder them together. Prolonged heat on the 1G connector pins can melt the plastic housing and loosen the pins.
-
Insulate Connections: After soldering each wire, slide the shrink wrap tubing over the soldered connection and heat it to insulate.
This image shows a close-up of the wiring process, illustrating the 2G wires being soldered to the 1G connector, with shrink wrap tubing ready for insulation, highlighting the meticulous nature of the conversion.
OBD2 Port Wiring
You’ll need to wire four specific wires from your harness to the OBD2 port connector. Consult resources like the ECMlink wiki for the precise OBD2 pinouts required for DSM applications. Decide on the OBD2 port’s location in your 1G DSM and extend the wires from the harness accordingly to reach the port.
ECU Installation and Testing
-
Install the Modified ECU: With the wiring complete, carefully plug your modified 2G ECU into your 1G DSM.
-
2G Ignition Firing Order: It is imperative to use a 2G ignition firing order after this conversion. Ensure your engine management system is configured accordingly.
-
Initial Testing: Turn the ignition to the ‘on’ position and attempt to connect to the ECU using ECMlink or a compatible diagnostic tool. If connection is successful, initiate a live data capture and check if throttle inputs are being read correctly. If you encounter connection issues, meticulously re-examine your wiring against the 2g DSM OBD2 pinout diagrams to identify any errors.
This image showcases the final step of the conversion, with the 2G ECU successfully installed in the 1G DSM, ready for testing and enjoying the benefits of OBD2 diagnostics.
Conclusion
Successfully wiring a 2G ECU into a 1G DSM for OBD2 functionality requires precision and a solid understanding of the 2g DSM OBD2 pinout. By following these steps and double-checking your connections, you can bring modern diagnostic capabilities to your 1G DSM. Remember to proceed with caution and consult professional resources and experienced individuals within the DSM community if you encounter challenges. Enjoy the enhanced functionality of your upgraded DSM!
