Inspection and Verification - Drive Cycle Test: Notes
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The drive cycle test can be used as a system evaluation test or repair verification test, or during diagnosis (for intermittent concerns).
For system evaluation, the customer may only have a general concern about the way the vehicle is braking. There may not be a clear system concern to troubleshoot. This test is designed to produce common system concern symptoms. Once a symptom is found, a symptom diagnostic procedure can be followed to repair the vehicle.
Always use this test after vehicle repairs because the anti-lock brake control module is unable to detect some system concerns unless the vehicle is driven under specific conditions. After completing the drive cycle test, carry out the self-test using the diagnostic tool.
NOTE:
Wetting down the area where the testing is to be carried out will aid in this test.
NOTE:
An assistant should be used to monitor the wheels during the ABS stop. Momentary lockup is permissible.
- While driving the vehicle approximately 16 km/h (10 mph), press the brake pedal hard enough to lock all four wheels.
- Does one wheel lock consistently?
- If yes and the yellow ABS warning indicator is not illuminated, GO to SYMPTOM CHART .
- If yes and the yellow ABS warning indicator is illuminated, retrieve and document the DTCs. Proceed to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- While driving the vehicle approximately 32 km/h (20 mph), perform a light-to-medium (normal traffic) stop.
- Does the pump motor turn on and are brake pedal pulsations felt at any time during the stop?
- If yes and the yellow ABS warning indicator is not illuminated, GO to SYMPTOM CHART .
- If yes and the yellow ABS indicator is illuminated, retrieve and document DTCs. Proceed to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- Clear continuous DTCs.
- Start the vehicle and shift the transmission into low gear.
- Allow the vehicle to creep forward at idle for at least 45 seconds.
- Does the yellow ABS indicator illuminate?
- If yes, retrieve and document theDTCs. Proceed to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- Slowly accelerate to 40 km/h (25 mph). Let at least 45 seconds elapse before reaching 40 km/h (25 mph).
- Does the yellow ABS warning indicator illuminate?
- If yes, retrieve and document the DTCs. Proceed to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- Has the customer concern been addressed and corrected by the previous actions?
- If yes, the system is OK.
- If no, GO to SYMPTOM CHART .