Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
PCM Reset
2005 Honda Civic L4-1.7L CNGSECTION PCM Reset
How to Reset the PCM
You can reset the PCM in either of 2 ways:
- Use the HDS or a scan tool to reset the PCM's memory.
See the HDS or a scan tool user's manuals for specific instructions.
- Turn the ignition switch OFF, and remove the No.6 ECU (PCM) (15 A) fuse (A) from the under-hood fuse/relay box (B) for 10 seconds.
NOTE: If the low fuel indicator is blinking, the PCM cannot be reset with the HDS or a scan tool. To reset the PCM, do the low fuel indicator troubleshooting.
How to End a Troubleshooting Session (required after any troubleshooting)
1. Reset the PCM as described.
2. Do the PCM idle learn procedure.
3. Turn the ignition switch OFF.
4. Disconnect the HDS or a scan tool from the DLC.
NOTE: The PCM is part of the immobilizer system. If you replace the PCM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobilizer code with the HDS.
You can reset the PCM in either of 2 ways:
- Use the HDS or a scan tool to reset the PCM's memory.
See the HDS or a scan tool user's manuals for specific instructions.
- Turn the ignition switch OFF, and remove the No.6 ECU (PCM) (15 A) fuse (A) from the under-hood fuse/relay box (B) for 10 seconds.
NOTE: If the low fuel indicator is blinking, the PCM cannot be reset with the HDS or a scan tool. To reset the PCM, do the low fuel indicator troubleshooting.
How to End a Troubleshooting Session (required after any troubleshooting)
1. Reset the PCM as described.
2. Do the PCM idle learn procedure.
3. Turn the ignition switch OFF.
4. Disconnect the HDS or a scan tool from the DLC.
NOTE: The PCM is part of the immobilizer system. If you replace the PCM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobilizer code with the HDS.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.