P1678

DTC P1678 EMS NO REQUEST (EMS DATA LINE OPEN. NO IMMO.)

DTC Detecting Condition:

DTC DETECTING CONDITION

INSPECTION PROCEDURE

1. PROBLEM VERIFICATION
1. Connect the hi-scan (pro) to data link connector.
2. Turn the ignition switch to ON and verify the DTC "P1678" is displayed.
3. Erase the DTC "P1678" with the hi-scan (pro) and then monitor again.

Is the same code displayed ?

NO - Problem is intermittent and ECM memory was not cleared

YES - Check harness and connector between and ECM.

2. CHECK HARNESS AND CONNECTOR BETWEEN ICM AND ECM
Check for continuity between ICM harness connector(M23-1) terminal 6 and ECM harness connector (C30-1) terminal 3.

Is there continuity ?

NO - Repair an open in the wire between the ICM and the ECM.

YES - If all the tests are OK, replace the ICM and recheck.