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Cruise Control Ecu Power Source Circuit

  1. Locate ECU-IG fuse (10-amp) in instrument panel junction block. 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 cruise control ECU connector terminal No. 9 (Yellow/Red wire) and ECU-IG fuse.
  2. Remove cruise control ECU with connector attached. SeeFigure. Turn ignition switch to ON position. Measure voltage by backprobing between cruise control ECU connector terminals No. 9 (Yellow/Red wire) and No. 16 (White/Black wire). If battery voltage is not present, go to next step. If battery voltage is present, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test under appropriate symptom.
  3. Turn ignition switch to OFF position. Backprobing connector, measure resistance between body ground and terminal No. 16 (White/Black wire) at cruise control ECU connector. If resistance is less than one ohm, repair wiring harness or connector between cruise control ECU connector terminal No. 9 (Yellow/Red wire) and battery. Retest system. If resistance is one ohm or more, repair wiring harness or connector between cruise control ECU connector terminal No. 16 and ground. Retest system.
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