Honda Civic Service Manual: ECM Removal and Installation (K24Z7)

1.

Make sure the ignition switch is in LOCK (0).

2.

Disconnect and isolate the negative cable and battery sensor (A) from the battery.

NOTE: Always disconnect the negative side first.

3.

Disconnect the positive cable (B) from the battery.

1.

Remove the cover (A).

2.

Disconnect ECM connectors A, B, and C.

NOTE: ECM connectors A, B, and C have symbols (A=□, B=△, C=○) embossed on them for identification.

3.

Remove the ECM (D).

1.

Connect ECM connectors A, B, and C.

NOTE: ECM connectors A, B, and C have symbols (A=□, B=△, C=○) embossed on them for identification.

2.

Install the ECM (D).

3.

Install the cover (A).

NOTE: If the battery performs abnormally, test the battery.

1.

Clean the battery terminals.

2.

Connect the positive cable (A) to the battery.

NOTE: Always connect the positive side first.

3.

Connect the negative cable and battery sensor (B) to the battery.

4.

Apply multipurpose grease to the terminals to prevent corrosion.

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 to ON (II).

3.

Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting.

1.

Turn the ignition switch to ON (II).

2.

Manually input the VIN to the ECM/PCM with the HDS.

NOTE: DTC P0630 VIN Not Programmed or Mismatch may be stored because the VIN has not been programmed into the ECM/PCM; ignore it, and continue this procedure.

1.

Select the IMMOBI SYSTEM with the HDS.

2.

Enter the immobilizer code using the ECM/PCM replacement procedure in the HDS; it allows you to start the engine.

1.

Select the INSPECTION MENU with the HDS.

2.

Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts.

NOTE: If the TP POSITION CHECK indicates FAILED, continue this procedure.

3.

Exit the HDS diagnostic system, then select the update mode, and follow the screen prompts to update the ECM/PCM.

4.

If the software in the ECM/PCM is the latest, disconnect the updating tool from the DLC, then go back to the procedure that you were doing. If the software in the ECM/PCM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system or the A/T system, make sure you update both.

NOTE: If the ECM/PCM update system requires you to cool the ECM/PCM, follow the instructions on screen. If you have a problem during the update procedure (programming takes over 15 minutes, status bar goes over 100 %, D or immobilizer indicator flashes, HDS tablet freezes, etc.), follow these steps to minimize the chance of damaging the ECM/PCM.

5.

If the TP POSITION CHECK failed in step 2, clean the throttle body.

1.

Reset the ECM/PCM with the HDS while the engine is stopped.

2.

Turn the ignition switch to LOCK (0).

3.

Turn the ignition switch to ON (II) and wait 30 seconds.

Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

1.

Let the engine idle for about 5 minutes with the throttle fully closed.

NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.