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Traction Control Valve #2

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAM.
  1. Using scan tool, read trouble codes. If scan tool displays MAIN RELAY/POWER CIRCUIT FAILURE, go to TEST 14A. If scan tool does not display MAIN RELAY/POWER CIRCUIT FAILURE, go to next step.
  2. If scan tool does not display TRACTION CONTROL VALVE #1, go to next step. If scan tool displays TRACTION CONTROL VALVE #1, verify vehicle is equipped with correct CAB. On models without LTCS, CAB has White part label. On models with LTCS, CAB has Blue part label. If vehicle is not equipped with correct CAB, replace CAB. Perform TEST VER-1A. If vehicle is equipped with correct CAB, go to next step.
  3. Turn ignition off. Disconnect CAB from HCU. See Figure . Inspect 14-pin connector. If connector is faulty, repair as necessary. Perform TEST VER-1A. If terminals are backed-out, replace HCU. Perform TEST VER-1A. If connector is okay, go to next step.
  4. Using an external ohmmeter, check resistance between valve block connector terminals No. 7 and 9. See Figure . If resistance is not 5-8 ohms, replace HCU. Perform TEST VER-1A. If resistance is 5-8 ohms, replace CAB. Perform TEST VER-1A.