Inspection and Verification

Special Tool(s)

Inspection and Verification

WARNING: BRAKE FLUID CONTAINS POLYGLYCOLETHERS AND POLYGLYCOLS. AVOID CONTACT WITH EYES. WASH HANDS THOROUGHLY AFTER HANDLING. IF BRAKE FLUID CONTACTS EYES, FLUSH EYES WITH RUNNING WATER FOR 15 MINUTES. GET MEDICALATTENTIONIFUU11TATION PERSISTS. IF TAKEN INTERNALLY, DRINK WATER AND INDUCE VOMITING. GET MEDICAL ATTENTION IMMEDIATELY.

CAUTION: Do not spill brake fluid onto painted surfaces. If spilled, wipe it up immediately.

NOTE: The control module ground must be verified before any measurement involving those pins can be made.

NOTE: EEC-IV 60-Pin Breakout Box pin numbers may not match anti-lock brake control module pin numbers.

Anti-Lock Brake Control Module Ground

Anti-Lock Brake Control Module Ground:

Throughout the pinpoint tests, many of the values given depend on the presence of a good ground available at pins 18,19,21, and 60. Once the EEC-IV 60-Pin Breakout Box and 40/60-Pin ABS Adapter Cable are installed, check for continuity between pins 18, 19, 21, and 60 and ground.

NOTE: Always check the fluid level in the brake master cylinder before performing the test procedures. If the fluid level is not at the MAX line, add High Performance DOT 3 Motor Vehicle Brake Fluid C6AZ-19542-AB or DOT 3 equivalent meeting Ford specification ESA-M6C25-A, DOT 3.

NOTE: The only part of the HCU assembly that is replaceable is the coil assembly. The rest of the HCU assembly is not repairable nor can it be pressure checked. If any part other than the coil assembly fails, the HCU assembly must be replaced as a complete unit.

NOTE: Radio Frequency Interference (RFI) can cause false Diagnostic Trouble CDTC'S (DTC'S) to be generated if aftermarket electrical work has been done.

NOTE: Problems in other areas may affect the operation of the ABS system. Those areas include:
^ Steering and suspension.
^ Tire integrity and air pressure.
^ Wheel bearings.
^ Brake components that are common to all brake systems.

Road Test

NOTE: Do not alter the vehicle prior to the Road Test. Any change may affect the intensity of the driver concerns and prevent an accurate diagnosis.

NOTE: The test driver should have a thorough knowledge of brake system operation and accepted general performance guidelines in order to make valid comparisons and detect performance problems.

Perform a Road Test to compare the vehicle braking performance with the driver concerns.
The Road Test should be performed on a smooth and level road. For optimum traction and control during the road test, avoid gravel, crowned or uneven road surfaces. Begin the Road Test with a general brake performance check.
This includes:
^ Test the brakes at different speeds using light, moderate, and heavy pedal pressure.
^ Be alert to noises, vibrations, and pulling or drifting conditions.
^ Avoid locking the brakes and skidding the tires. Locked brakes do not indicate braking efficiency.

Drive Cycle Test
The Drive Cycle Test will serve three possible purposes:
^ Symptom Evaluation Drive. When a vehicle is brought to the dealer, the customer may only have a general concern about the way the vehicle is braking. In these situations, there may not be a clear system concern to troubleshoot. This drive test is designed to produce common system concern symptoms. Once a symptom is found, a symptom troubleshooting procedure can be followed to repair the vehicle.
^ Concern Repeatability Drive. This drive procedure is used to verify concern repeatability prior to continuing the diagnostic procedures detailed in the pinpoint tests. After clearing all retrieved DTC'S, the vehicle should be driven in an attempt to repeat the concern. Following this drive, retrieve all DTC'S and return to the pinpoint test.
^ Repair Verification Drive. This drive procedure can be used after all repairs. Because the anti-lock brake control module is unable to detect some system concerns until the vehicle is being driven in a certain way, this drive test can be helpful in developing further confidence in the ABS system operation before delivery to the customer.