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Test C: Unexpected Brake Pedal Action

  1. Depress brake pedal. If brake pedal stroke is excessively long, perform PRELIMINARY CHECKS  under TROUBLE SHOOTING. Repair as necessary and retest system. If brake pedal stroke is okay, go to next step.
  2. Disconnect ABS/TCS control unit 31 pin harness connector. See Figure . Road test vehicle and check if braking is effective. If braking is effective, reconnect harness connector and go to next step. If braking is not effective, perform PRELIMINARY CHECKS  under TROUBLE SHOOTING. If a problem is found, repair as necessary and retest system.
  3. Road test vehicle and observe ABS warning light. If warning light stays off, go to next step. If warning light is on, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM  .
  4. Check wheel sensors and circuits. See DIAGNOSTIC PROCEDURE NO. 1  under DIAGNOSTIC TESTS. If a problem is found, repair as necessary and retest system. If wheel sensors and circuits are okay, go to next step.
  5. Disconnect ABS/TCS control unit 31 pin harness connector. See Figure and Figure . Inspect ABS/TCS control unit pins for damage. Inspect harness connector terminals for damage or loose connections. Reconnect ABS/TCS control unit 31 pin harness connector and perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM  .
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