Installation

Make sure that the notch on the PROMs are in line with the notch on the PROM sockets. PROM notch will be oriented towards the red connector.

1. Carefully install new PROMs, noting that one PROM has 28 pins and the other 32 pins.

2. Check for bent pins before replacing PROM covers.

3. Position circuit board and fasten with screws.

4. Install outer cover. Fasten with screws removed earlier. Torque to 2.25-2.82 Nm (20-25 lb. in).

5. Apply the self-adhesive update label on the side of the ECM to signify that the update has been done.

6. Reconnect wire harnesses and install ECM.

7. Install ECM protective cover and washer reservoir.

VERIFICATION AND ROADTEST

A. Switch on ignition. The fuel pump should run for a short period. Listen for any unusual noises such as injectors operating or relays clicking which would indicate a problem.

B. Observe that the Check Engine light comes on and stays on during the bulb check. If not, check the multiple connection. If necessary, replace the ECM.

C. If the vehicle fails steps A or B, recheck the multiple connector pins and socket. If this does not resolve the problem, check that the PROM was installed correctly.

8. Perform quality check procedure below.

QUALITY CHECK PROCEDURE

Start engine and observe the following:

1. The Check Engine light remains out.
2. Idle speed smoothness is stabilized.
3. Switch on A/C, and note idle speed compensation.
4. Rev the engine; no misfire should be noted.
5. Select drive and note idle speed compensation - automatic only (brakes applied).

9. Roadtest the vehicle (drive cycle B per service bulletin W96-007).