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Drive Test

  1. Perform Low Speed ABS Stop

    Before performing test, wet down stopping surface to aid test procedure. Drive vehicle at about 10 MPH. Press brake pedal enough to lock all 4 wheels. Momentary lock-up is permissible. If ABS does not cycle and ABS warning light is not on, go to next step. If ABS does not cycle and other symptoms exist, go to step 6). If ABS cycles and ABS warning light is not on, go to SYMPTOM B  under SYMPTOM TESTS. If ABS cycles and ABS warning light is on and stays on, go to step 7).

  2. Check For Unwarranted ABS Activity

    1) Drive vehicle at approximately 20 MPH. If windshield wipers are on, turn wipers off. Perform light to medium normal stop. Check for brake pedal pulsation. If ABS pump motor runs, brake pedal pulsation is felt at any time during stop and ABS warning light is not on, go to SYMPTOM A  under SYMPTOM TESTS. If pump motor runs, brake pedal pulsation is felt at any time during stop and ABS warning light comes on and stays on, go to step 7). If pump motor does not run and brake pedal pulsation is not felt at any time during stop, but other symptoms exist, go to step 6). If pump motor does not run, brake pedal pulsation is not felt at any time during stop and ABS light is not on, go to next step. If vehicle pulls immediately upon braking and pump motor does not run, go to SYMPTOM E  under SYMPTOM TESTS. If vehicle pulls as soon as pump motor runs, check front sensor opposite pull. Go to SYMPTOM A  under SYMPTOM TESTS. If pump motor runs and no pull is felt, check rear sensor. Go to SYMPTOM A  under SYMPTOM TESTS.

  3. High Sensor Gap (Creep) Test

    Clear codes. Turn ignition off. Start vehicle and shift into Drive Low (automatic) or 1st gear (manual). Allow vehicle to creep forward at idle for at least 45 seconds. If ABS warning light does not come, go to next step. If ABS warning light comes, go to step 8).

  4. High Sensor Gap On Acceleration Test

    Clear codes. Turn ignition off. Start vehicle and shift into Drive (automatic) or 1st gear (manual). In a time period of at least 45 seconds, accelerate vehicle slowly to 25 MPH. If ABS warning light comes on, go to step 8). If ABS warning light does not come on, go to next step.

  5. Drive Test Complete

    If all symptoms have been corrected, drive test procedure is complete. ABS system is functioning properly. If symptoms still exist, go to SYMPTOM TESTS  to identify current symptom diagnosis.

  6. Check Brake Symptoms

    Check brake system for following symptoms: hard or soft brake pedal, lack of sufficient vehicle deceleration upon brake application or vehicle pulls during braking, and ABS pump motor does not run. If any of these symptoms exist, go to SYMPTOM DIAGNOSTIC CHART  under SYMPTOM TESTS. If none of these symptoms exist, problem is not in ABS. Check brake mechanical or hydraulic system.

  7. Check For Trouble Codes

    Check for ABS diagnostic codes. If previous code still is present and pinpoint test for specified code has been completed, perform INTERMITTENT DIAGNOSIS PROCEDURE  . If pinpoint test was not completed, return to specified pinpoint test and complete test. If code is not previous code, go to appropriate pinpoint test for specified code. See the TROUBLE CODE DIRECTORY  . If no code or SYSTEM PASS is present, go to SYSTEM PRECHECKS  .

  8. Incorrect Sensor Signal Test

    Check for ABS diagnostic codes. If any codes are present, perform appropriate pinpoint test. See the TROUBLE CODE DIRECTORY  . If no codes are present or SYSTEM PASS is present, perform procedures in SYSTEM PRECHECKS  .
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