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.
How to Substitute the PCM
2005 Honda Accord L4-2.4LSECTION How to Substitute the PCM
Substituting the PCM
Special Tools Required
^ Honda diagnostic system (HDS)
^ Honda interface module (HIM)
^ HDS pocket tester
NOTE: Use this procedure when you need to substitute a known-good PCM during troubleshooting procedures.
1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the PCM. If it doesn't, go to the DLC circuit troubleshooting.
'06-07 models: If you are returning from DLC circuit troubleshooting, skip steps 4 to 11, then clean the throttle body after substituting the PCM.
4. '06-07 models: Select the INSPECTION MENU with the HDS.
5. '06-07 models: Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts.
NOTE: If the TP POSITION CHECK indicates FAILED, continue this procedure.
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Remove the center lower covers (A).
9. Remove the duct (B).
10. Disconnect the PCM connectors (C).
11. Remove the bolts (D), then remove the PCM (E).
12. Install the known good PCM in the reverse order of removal.
13. Open the SCS line with the HDS.
14. Turn the ignition switch ON (II).
NOTE:
'05-07 models: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because VIN has not been programmed into the PCM; ignore it, and continue this procedure.
15. '05-07 models: Manually input the VIN to the PCM with the HDS.
16. Update the PCM if it does not have the latest software.
17. Select the IMMOBI SYSTEM with the HDS.
18. Enter the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
19. Reset the PCM with the HDS.
20. '06-07 models: If the TP POSITION CHECK failed in step 5, clean the throttle body.
21. Do the PCM idle learn procedure.
22. Do the CKP pattern learn procedure.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.