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MALFUNCTION INDICATOR LIGHT DOES NOT COME ON

MALFUNCTION INDICATOR LIGHT DOES NOT COME ON

DIAGNOSIS:

The malfunction indicator light circuit is open or shorted.

TROUBLE SYMPTOM:

When the ignition switch is turned ON (engine OFF), malfunction indicator light does not come on.

WIRING DIAGRAM:


CHECK OUTPUT SIGNAL FROM ECM.

Turn the ignition switch to ON.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B134) No. 17 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Yes


No


CHECK POOR CONTACT.

Check poor contact by shaking or pulling ECM connector and harness.

Does the malfunction indicator light illuminate?

Yes

Repair poor contact in ECM connector.


No


CHECK ECM CONNECTOR.

Check the ECM connector connection.

Is the ECM connector correctly connected?

Yes

Replace the ECM.


No

Repair connection of ECM connector.


CHECK HARNESS BETWEEN COMBINATION METER AND ECM CONNECTOR.

Turn the ignition switch to OFF.

Remove the combination meter.

Disconnect the connector from ECM and combination meter.

Measure the resistance of harness between ECM and combination meter connector.

Connector & terminal

(B134) No. 17 — (i10) No. 6:

Is the resistance less than 1 Ω?

Yes


No

• Repair harness and connector.

•
Note

In this case, repair the following:

• Open circuit in harness between ECM and combination meter connector

• Poor contact in coupling connector



CHECK POOR CONTACT.

Check poor contact in combination meter connector.

Is there poor contact in combination meter connector?

Yes

Repair poor contact in combination meter connector.


No


CHECK HARNESS BETWEEN COMBINATION METER AND IGNITION SWITCH CONNECTOR.

Turn the ignition switch to ON.

Measure the voltage between combination meter connector and chassis ground.

Connector & terminal

(i12) No. 7 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes

Replace the combination meter circuit board.


No

• Check the following and repair if necessary.

•
Note
• Blown out fuse (No. 13)

• Open or short circuit in harness between fuse (No. 13) and battery terminal

• Poor contact in ignition switch connector