ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Malfunction Indicator Light

MALFUNCTION INDICATOR LIGHT REMAINS BLINKING

DIAGNOSIS:

The delivery (test) mode connector circuit is shorted.

TROUBLE SYMPTOM:

Malfunction indicator light blinks when delivery (test) mode connector is not connected.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK DELIVERY (TEST) MODE CONNECTOR.

1) Disconnect the delivery (test) mode connector.

2) Turn the ignition switch to ON.

Does the malfunction indicator light blink?

System is normal.

NOTE:

Malfunction indicator light blinks at a cycle of 3 Hz when delivery (test) mode connector is connected.

2.CHECK HARNESS BETWEEN ECM AND CHASSIS GROUND TERMINAL.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Measure the resistance of harness between ECM connector and chassis ground.

Connector & terminal

(B135) No. 7 — Chassis ground:

Is the resistance less than 5 Ω?

Repair the short circuit to ground in harness between ECM connector and delivery (test) mode connector.

Replace the ECM.