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Drive Cycle Test

NOTE: This test will provide information on symptom evaluations, symptom repeatability, and repair verification.

  1. Low Speed ABS Stop

    If possible, drive on wet road condition and have assistant monitor wheels during ABS stop. Drive at 10 MPH, press brake pedal hard enough to lock all wheels. If one wheel locks consistently and if ABS warning light does not come on, see WHEELS LOCK UP  under INTERMITTENT FAILURES. If ABS warning light comes on, go to step  7. If one wheel does not lock up consistently and ABS warning light does not come on, go to next step.

  2. Check For Unwanted ABS Activity

    Drive vehicle at 20 mph. Perform light-to-medium stop. If pump motor turns on and brake pulsations are felt, and if ABS warning light comes on, see ABS MISFIRE, TOO SENSITIVE, ACTIVATES ON NORMAL STOPS  under INTERMITTENT FAILURES. If ABS warning light comes on and stays on, go to step  7. If preceding does not happen and other symptoms are present, go to step  6. If ABS warning light does not come on, go to next step.

  3. Check For Marginally High Sensor Gap At Idle

    Connect scan tester and clear any continuous DTCs. Turn ignition off, then start and idle vehicle. Allow vehicle to creep forward at idle for at least 45 seconds. If ABS warning light comes on, go to step  8. If light does not come on, go to next step.

  4. Check For Marginally High Sensor Gap

    Clear any continuous DTCs. Turn ignition off. Start vehicle and slowly accelerate to 25 MPH, making sure this takes at least 45 seconds. If ABS warning light comes on, go to step  8. If light does not come on, go to next step.

  5. Determine If Drive Test Is Complete

    If customer concern has been addressed and corrected by previous steps, test is complete. If concerns remain, go to INTERMITTENT FAILURES .

  6. Determine Next Diagnostic Step Based On Brake Symptom

    Test for lack of sufficient deceleration during braking or if vehicle pulls and pump motor does not come on. If either symptom occurs, go to INTERMITTENT FAILURES . If neither symptom occurs, problem is not in ABS system. Refer to appropriate DISC & DRUM article for diagnosis.

  7. Retrieve DTCs

    Connect scan tester and retrieve codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES . If DTC is same as before and proper test has been completed, go to INTERMITTENT FAILURES . If test is not complete, return to last step and complete test. If different DTC is retrieved, go to ABS DIAGNOSTIC TROUBLE CODE DEFINITIONS  Or TRACTION CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. If ABS control module does not respond, go to SYSTEM PRE-CHECK .

  8. Determine Which Sensor Signal Is Incorrect

    Retrieve and record continuous DTCs. Is sensor code is obtained, see ABS DIAGNOSTIC TROUBLE CODE DEFINITIONS  Or TRACTION CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. If no code or no SYSTEM PASS is obtained, see SYSTEM PRE-CHECK .
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