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)
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Does the malfunction indicator light illuminate?
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Repair the malfunction indicator light circuit. 
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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.
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Does the malfunction indicator light illuminate?
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Repair the ground short circuit of harness between ECM and combination meter connector.
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3.CHECK HARNESS BETWEEN ECM AND DELIVERY (TEST) MODE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance of harness between delivery (test) mode connector and ECM.
Connector & terminal
(B76) No. 1 — (B135) No. 3:
(B76) No. 1 — (B135) No. 4:
(B75) No. 1 — (B136) No. 35:
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Is the resistance less than 1 Ω?
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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
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4.CHECK FOR POOR CONTACT.
Check for poor contact of the ECM connector.
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Is there poor contact in ECM connector?
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Repair the poor contact of the ECM connector.
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Replace the ECM.
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