Visual Inspection and Diagnostic Pre-checks

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Make sure the stoplamp switch electrical connector is connected and free of corrosion and other contaminants.
Make sure the stoplamp switch is installed correctly.
Make sure the stoplamp switch operates correctly.

Fig 1: Antilock Braking System (ABS) Module Connector - C135

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 2: Powertrain Control Module-B (PCM-B) Connector - C175B

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 3: Powertrain Control Module-E (PCM-E) Connector - C175E

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 4: Brake Pedal Position (BPP) Switch Connector - C278

Courtesy of FORD MOTOR CO.

Harness Side

AC1: CHECK FOR ABS MODULE DTCS

Ignition ON, engine OFF.
Carry out the ABS self-test.
Are any lost communication with PCM, invalid data from PCM, pressure sensor, wheel speed sensor or stability control sensor DTCs present in the ABS module?

Yes	No
DIAGNOSE all lost communication with PCM, invalid data from PCM, pressure sensor, wheel speed sensor or stability control sensor DTCs before diagnosing DTC C0040:xx or C0044:xx. REFER to the ABS Module DTC Chart.	Go to AC2.

AC2: CHECK THE PCM FOR DTCS

Carry out the PCM KOEO self-test.

Are any DTCs present?

Yes	No
DIAGNOSE all PCM DTCs before diagnosing DTC C0040:xx or C0044:xx. REFER to the appropriate Electronic Engine Controls article. If the scan tool cannot communication with the PCM, DIAGNOSE the no communication concern. REFER to the Module Communications Network article.	Go to AC3.

AC3: CHECK THE BPP SWITCH AND BRAKE PEDAL ASSEMBLY INSTALLATION

Inspect the BPP switch and brake pedal assembly. Verify there is no brake pedal pressure unintentionally applied due to incorrect BPP switch or brake pedal installation.
- For BPP (stoplamp) switch installation, refer to the Exterior Lighting article.
- For brake pedal installation, refer to the Hydraulic Brake Actuation article.
Is the stoplamp switch and brake pedal assembly installed correctly?

Yes	No
Go to AC4.	REINSTALL the brake pedal assembly or BPP switch correctly. REFER to the Hydraulic Brake Actuation article or the Exterior Lighting article

AC4: CHECK THE PCM BPP (BOO1) PID

Ignition ON, engine OFF.
Access the PCM and monitor the BOO1 (MODE) PID.
Apply and release the brake pedal.
Does the PID reflect the brake pedal movement?

Yes	No
Go to AC5.	DIAGNOSE the stoplamps. REFER to the Exterior Lighting article.

AC5: CHECK THE ABS MODULE BRAKE PRESSURE PID

Access the ABS and monitor the BRKHYDPRESS (PRESS) PID.
Apply and release the brake pedal.
Does the PID read approximately 0 PSI with the brake pedal released and then increase when the brake pedal is applied?

Yes	No
Go to AC6.	Go to PINPOINT TEST Y .

AC6: CHECK THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID

Access the ABS and monitor the BOO_ABS (MODE) PID.
Access the ABS and monitor the BRK_SWPED (MODE) PID.
Access the ABS and monitor the BRAKE_SW (MODE) PID.
Apply and release the brake pedal.
Does the PID reflect the brake pedal movement?

Yes	No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.	Go to AC7.

AC7: CHECK FOR CORRECT ABS MODULE TO HCU FASTENER TORQUE VALUES

Verify all ABS module-to-HCU fasteners are tightened to their correct torque specifications.
Are the ABS module-to-HCU fasteners tightened correctly?

Yes	No
Go to AC9.	TIGHTEN all ABS module-to-HCU fasteners to their specified torque value. Go to AC8.

AC8: CHECK FOR RETURNING ABS MODULE DTCS

Ignition ON, engine OFF.
Clear the ABS DTCs.
Ignition OFF.
Ignition ON, engine OFF.
Test drive the vehicle, carry out at least 3 stops.
Carry out the ABS self-test.
Are any of the DTCs in the DTC Fault Trigger Conditions table retrieved again?

Yes	No
Go to AC9.	The condition causing the concern has been repaired. RETURN the vehicle to the customer.

AC9: VERIFY ALL WIRING CONNECTIONS

Ignition OFF.
ABS Module connector disconnected. (C135)
PCM_B connector disconnected. (C175B)
PCM_E connector disconnected. (C175E)
BPP Switch connector disconnected. (C278)
Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals?

Yes	No
Go to AC10.	REPAIR the connector or terminals. Refer to OEM Connector Repair Procedures article for schematic and connector information.

AC10: CHECK FOR APPLICABLE SERVICE ARTICLES

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA.
Do any applicable service articles exist?

Yes	No
DISCONTINUE this test and FOLLOW the service article instructions.	Go to AC11.

AC11: CHECK FOR CORRECT ABS OPERATION

BPP Switch connector connected. (C278) Make sure the connector seats and latches correctly.
PCM_E connector connected. (C175E) Make sure the connector seats and latches correctly.
PCM_B connector connected. (C175B) Make sure the connector seats and latches correctly.
ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
Operate the system and determine if the concern is still present.
Is the concern still present?

Yes	No
INSTALL a new ABS module. INSTALL a new ABS module and HCU assembly. REFER to the Anti-Lock Brake System (ABS) and Stability Control article. ORDER a replacement ABS module and HCU assembly. INCLUDE the RVC on the form. If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.