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Test 21A: Traction Control Valve Circuit

NOTE: Perform TEST VER-1A: VERIFICATION TEST  before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS  .
  1. DTC may be caused by loose connections between CAB and HCU, loose connections at solenoid valve circuits, defective CAB or solenoid. Go to next step.
  2. Using scan tool, read DTCs. If scan tool displays VALVE POWER FEED CIRCUIT, perform TEST 20A: VALVE POWER FEED CIRCUIT  . If scan tool does not display VALVE POWER FEED CIRCUIT, go to next step.
  3. Turn ignition off. Remove CAB from HCU. Inspect valve block connector on bottom of pump/motor and HCU for damaged or pushed-out terminals. See Figure . If terminals are okay, go to next step. If terminals are damaged or pushed-out, replace HCU. Perform TEST VER-1A: VERIFICATION TEST  .
  4. Using an external ohmmeter, check resistance between HCU terminal No. 7 and suspected HCU traction control valve terminal. See HCU TERMINAL IDENTIFICATION  table. If resistance is 5-8 ohms, replace CAB. Perform TEST VER-1A: VERIFICATION TEST  . If resistance is not as specified, replace HCU. Perform TEST VER-1A.
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