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Home >> Toyota >> 1996 >> 4Runner Base, 4WD, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Circuit Testing >> Test 12, Cc Ecu Power Source
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Test 12, Cc Ecu Power Source

  1. Locate ECU-IG fuse in junction block No. 1. See Figure. Remove ECU-IG fuse and ensure fuse continuity. If fuse is okay, go to next step. If fuse is not okay, check for short between CC ECU connector terminal No. 14 (Yellow wire) and ECU-IG fuse.
  2. Remove CC ECU with connector connected. Turn ignition on. Using voltmeter positive lead, backprobe CC ECU connector terminal No. 14/B+ (Yellow wire). Ensure battery voltage exists between CC ECU connector terminal No. 14/B+ and CC ECU connector terminal No. 13/GND (White/Black wire). 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.
  3. Turn ignition off. Backprobe CC ECU connector terminal No. 13/GND (White/Black wire) and measure resistance between CC ECU connector terminal No. 13 and ground. If one ohm or less resistance is present, repair harness or connector between CC ECU connector and battery. If resistance measured is greater than one ohm, repair harness or connector between CC ECU connector terminal No. 13 and ground.
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