Multiplex Integrated Control System MICU Input Test

Multiplex Integrated Control System MICU Input Test

NOTE: Before testing the MICU, troubleshoot the multiplex integrated control unit first using B-CAN System Diagnosis Test Mode A. Troubleshooting - B-CAN System Diagnosis Test Mode A

1. Turn the ignition switch to LOCK (0).

2. Disconnect under-dash fuse/relay box connectors E, F, G, K, R, and T.
NOTE: All connector views are wire side of female terminals.

3. Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.

- If the terminals look OK, go to step 4.

4. With the connectors still disconnected, do these input tests at the following connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 5.





5. Reconnect the connectors to the under-dash fuse/relay box, and do these input tests at the following connectors.
- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box. Under-dash Fuse/Relay Box Removal and Installation