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Left Front Sensor Circuit Failure

  1. Using DRB-II, read and record all speed sensor fault messages. If DRB-II does not display LEFT FRONT SENSOR CIRCUIT FAILURE, perform TEST 8A. If DRB-II displays LEFT FRONT SENSOR CIRCUIT FAILURE, inspect left front wheel speed sensor for damage. If sensor is damaged, repair or replace sensor as necessary. Perform VERIFICATION TEST VER-1A. If sensor is okay, turn ignition off.
  2. Disconnect and inspect CAB 55-pin connector. Repair connector as necessary. Turn ignition on. With DRB-II in voltmeter mode, probe terminal No. 48 (Red wire) of CAB connector. If voltage is present, repair short to battery in Red wire. Perform VERIFICATION TEST VER-1A.
  3. If voltage is not present, turn ignition off. With DRB-II in ohmmeter mode, probe terminal No. 48 (Red wire) of CAB connector. If resistance is less than 5 ohms, repair short to ground in Red wire. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, go to next step.
  4. Using an external ohmmeter, check resistance between terminal No. 48 (Red wire) and No. 30 (Red/Dark Blue wire) of CAB connector. If resistance is 900-1300 ohms, replace CAB. Perform VERIFICATION TEST VER-1A. If resistance is not 900-1300 ohms, disconnect and inspect left front wheel speed sensor connector.
  5. Using an external ohmmeter, check resistance between left wheel speed sensor connector terminals. If resistance is not 900-1300 ohms, replace wheel speed sensor. Perform VERIFICATION TEST VER-1A. If resistance is 900-1300 ohms, check resistance of Red wire between terminal No. 48 of CAB connector and No. 1 of left front wheel speed sensor connector using an external ohmmeter.
  6. If resistance is more than 5 ohms, repair open Red wire. Perform VERIFICATION TEST VER-1A. If resistance is less than 5 ohms, repair open Red/Dark Blue wire. Perform VERIFICATION TEST VER-1A.
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