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Test 9, Electronically Controlled Transmission (ECT) Circuit

  1. Start engine and bring to operating temperature. Drive vehicle and ensure overdrive operation is turned on and off when overdrive ON-OFF switch is operated. If overdrive switch is okay, go to next step.
  2. Remove CC ECU and disconnect connector. Turn ignition on. Using voltmeter positive lead, backprobe CC ECU harness connector terminal No. 9/OD (Red wire) with negative lead to ground. Ensure battery voltage exists. If voltage is as specified, go to next step. If voltage is not as specified, go to step 5).
  3. Turn ignition off and connect CC ECU connector. Using voltmeter positive lead, backprobe CC ECU harness connector terminal No. 22/ECT (Brown/Yellow wire) with negative lead to ground. Bring engine to operating temperature and test drive vehicle with overdrive switch moved from ON to OFF position. Ensure less than one volt exists in overdrive ON position and battery voltage exists in overdrive OFF (3rd gear) position. If voltage is as specified, go to test for next trouble code displayed or appropriate TROUBLE SHOOTING BY SYMPTOM . If voltage is not as specified, go to next step.
  4. Check harness and connectors between CC ECU harness connector terminal No. 22/ECT (Brown/Yellow wire) and electronic controlled transmission solenoid (Brown/Yellow wire). Repair or replace as necessary. If harness and connectors are okay, replace CC ECU and retest system.
  5. Check harness and connectors between CC ECU harness connector terminal No. 9/OD (Red wire) and Engine Control Module (ECM) connector terminal No. 20 (Red wire). Repair or replace as necessary. If harness and connectors are okay, replace ECM/PCM.
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