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Home >> Volvo >> 1987 >> 780 AW71L >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Testing >> Circuit Tests >> Ground Circuits

Ground Circuits

  1. Turn ignition switch to the "OFF" position. Connect ohmmeter across ground and terminals No. 10, 20, 32 and 34 of ECU connector. Resistance should be zero in all cases.
  2. If resistance is not correct, check wiring harness to and from ECU for damage and correct connections. Circuits No. 10, 20 and 34 are grounded at right side taillight. If a fault is found at terminal No. 32, test with a new solenoid valve relay.
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