Signal Faulty - Intermittent Fault

ECM-720A IMMOBILIZER COMMUNICATION
SIGNAL FAULTY - INTERMITTENT FAULT

Checking the components and wires



The engine control module has detected a fault in the communication between the immobilizer and the engine control module on an earlier occasion.

Visually check the immobilizer connections and connector as described in [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the signal wire between engine control module B22 (B32) and immobilizer B5 (A35) for an intermittent open circuit as described in [1][2]Checking Wiring and Terminals. Intermittent Faults, for an intermittent short-circuit to ground as described in [1][2]Checking Wiring and Terminals. Intermittent Faults,and for an intermittent short circuit to voltage supply as described in [1][2]Checking Wiring and Terminals. Intermittent Faults

Do the necessary corrective action.

Additional information:
- To access/replace the immobilizer, Immobilizer Control Module, Replacing
- To access/replace the engine control module, Engine Control Module (ECM), Replacing
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T
- For immobilizer signal description, Signal Description, Immobilizer


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.