Engine Control Module (ECM)
Notice: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.
Service of the ECM normally consists of either replacement or reprogramming. If the diagnosis indicates a replacement is needed, make sure that the replacement ECM is the correct part. If the new ECM is correct, remove the malfunctioning ECM and install the new service ECM. Reprogram the new ECM with the frequency code of the theft deterrent module currently on the vehicle. Before programming the new ECM, ensure that the following conditions exist:
| • | The battery is fully charged. |
| • | The ignition switch is in the RUN position. |
| • | The connection at the data link connector DLC is secure. |
Follow the instructions on the Tech Line terminal and the scan tool when programming the ECM. if the ECM fails to accept the program, check the following conditions:
| • | Inspect all of the ECM connections. |
| • | Verify that the scan tool has the latest version of the software. |
ECM Location
Notice: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.
Important: In order to prevent any internal ECM damage, the ignition must be turned OFF when disconnecting or reconnecting the power to the ECM. This includes disconnecting/reconnecting the battery cables, the ECM fuse, the jumper cables, etc.
Removal Procedure
- Turn OFF the ignition.
- Remove the Under Hood Fuse/Relay Cover.
- Grasp the ECM (2) and slide the unit straight up and out of the underhood relay center.
- Flip the release lever and disconnect the ECM connectors (1, 3) from the ECM (2).
- Loosen and remove the fastener retaining the ECM ground.
- Remove the fasteners and then remove the ECM (2) from the backing plate.
Installation Procedure
- The ignition must be OFF.
- Install the ECM (2) to the backing plate and tighten the fasteners.
- Install the ECM ground and tighten.
- Carefully align the harness connector with the ECM connector.
- Guide the connector into place while moving the release lever to the locked position.
- Align the backing plate of the ECM with the slots in the relay center and slide the unit into the underhood relay center.
- Program the frequency code of the new ECM with the frequency of the theft deterrent module that is currently on the vehicle.
- Perform the idle learn procedure by turning the key ON for 30 seconds while leaving the engine OFF.
- Install the Under Hood Fuse/Relay Cover.
