ENGINE (DIAGNOSTICS)(H4DOTC) > Malfunction Indicator Light

MALFUNCTION INDICATOR LIGHT DOES NOT BLINK

DIAGNOSIS:

• The malfunction indicator light circuit is open or shorted.

• The delivery (test) mode connector circuit is open.

TROUBLE SYMPTOM:

Malfunction indicator light does not blink during Inspection Mode.

WIRING DIAGRAM:

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1.CHECK STATUS OF MALFUNCTION INDICATOR LIGHT.

1) Turn the ignition switch to OFF.

2) Disconnect the delivery (test) mode connector.

3) Turn the ignition switch to ON. (engine OFF)

Does the malfunction indicator light illuminate?

Repair the malfunction indicator light circuit.

2.CHECK HARNESS BETWEEN ECM AND COMBINATION METER CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from the ECM.

3) Turn the ignition switch to ON.

Does the malfunction indicator light illuminate?

Repair the ground short circuit of harness between ECM and combination meter connector.

3.CHECK HARNESS BETWEEN ECM AND DELIVERY (TEST) MODE CONNECTOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance of harness between ECM and delivery (test) mode connector.

Connector & terminal

(B76) No. 1 — (B136) No. 6:

(B75) No. 1 — (B135) No. 27:

Is the resistance less than 1 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between ECM and delivery (test) mode connector

• Poor contact of joint connector

4.CHECK FOR POOR CONTACT.

Check for poor contact of the ECM connector.

Is there poor contact in ECM connector?

Repair the poor contact of the ECM connector.

Replace the ECM.