Normal Operation and Fault Conditions

On vehicles equipped with a 3.5L or a 3.7L engine, the TCM in an internal part of the PCM. With the ignition ON, the PCM sends messages to the ABS module over the HS-CAN. If the ABS module does not receive these messages within the specified time frame, the ABS module sets DTCs. This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network. For information on the messages sent to the ABS module by the PCM, refer to the Description and Operation in ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .

The stoplamp switch (also known as the brake pedal switch, BPP switch and BOO switch) contains 2 sets of contacts, one set for a voltage signal and the other set for a ground signal.

For the voltage signal input, the stoplamp switch receives voltage at all times from the BCM. When the brake pedal is applied, the normally open switch closes and routes voltage to the BCM and the PCM.

For the ground signal input, the stoplamp switch receives a voltage signal from the PCM. The voltage signal is routed to ground through the normally closed switch. When the brake pedal is applied, the normally closed switch opens, interrupting the voltage signal from the PCM.

When the PCM receives these inputs it sends a message on the HS-CAN to the ABS module and other modules.

PPT I ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Condition
P1571:64	Brake Switch: Signal Plausibility Failure	Sets when the ABS module receives a brake pedal switch message and other module inputs disagree or the ABS module does not receive a brake pedal switch message and other module input indicates vehicle braking.
U0100:00	Lost Communication With ECM/PCM "A": No Sub Type Information	Sets when the ABS module does not receive any messages from the PCM.
U0100:87	Lost Communication With ECM/PCM "A": Missing Message	Sets when the ABS module detects any of the following messages is missing: accelerator pedal position, brake pedal position, brake on-off switch, cruise control status or engine RPM.
U0101:00	Lost Communication With TCM: No Sub Type Information	Sets when the ABS module does not receive any messages from the PCM.
U0101:87	Lost Communication With TCM: Missing Message	Sets when the ABS module detects the transmission gear position or transmission gear lever (PRNDL) position message is missing.
U0401:68	Invalid Data Received From ECM/PCM "A": Event Information	Sets when the ABS module detects any of the following message is "invalid" instead of the actual information: accelerator pedal position, brake pedal position, brake on-off switch, cruise control status or engine RPM.
U0401:82	Invalid Data Received From ECM/PCM "A": Alive/Sequence Counter Incorrect/Not Updated	Sets when the ABS module detects the cruise control status counter message does not increase following a cruise control event.
U0402:68	Invalid Data Received From TCM: Event Information	Sets when the ABS module detects the transmission gear position or transmission gear lever (PRNDL) position message is "invalid" instead of the actual gear or gear lever position.

Network communication concern
Stoplamp switch
PCM
ABS module

I1: CHECK THE COMMUNICATION NETWORK

Ignition ON, engine OFF.
Press the Read Vehicle Information button to view the results of the modules communicating on the network.
Retrieve the continuous memory DTCs.

Does the PCM pass the Network Test?

Yes	No
Go to I2.	DIAGNOSE the PCM does not communicate with the diagnostic scan tool. REFER to MODULE COMMUNICATIONS NETWORK .

I2: RECHECK FOR DTC P1571:64

Carry out the ABS self-test.
Clear the ABS DTCs.
Ignition OFF.
Ignition ON, engine OFF.
Carry out the ABS self-test.

Is DTC P1571:64 retrieved again?

Yes	No
Go to I3.	If no DTCs are present, the system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. If DTC U0100:00, U0100:87, U0101:00, U0101:87, U0401:68, U0401:82 or U0402:68 is present, Go to I5.

I3: INSPECT THE STOPLAMP SWITCH

Inspect the stoplamp switch for correct installation and obvious signs of damage.
Observe the stoplamp switch while pressing and releasing the brake pedal.

Is the stoplamp switch correctly installed, free from obvious signs of damage and does it operate correctly?

Yes	No
Go to I5.	If the switch is damaged, INSTALL a new stoplamp switch. REFER to EXTERIOR LIGHTING SYSTEM . If the switch is not installed correctly or does not operate correctly, Go to I4.

I4: VERIFY BRAKE PEDAL SWITCH INSTALLATION

NOTE: Follow all notes and cautions in the stoplamp switch removal and installation procedure.

Remove and install the stoplamp switch. Refer to the EXTERIOR LIGHTING SYSTEM .
Test drive the vehicle at speeds above 20 km/h (12 mph) and carry out at least 2 complete stops.
Carry out the ABS self-test.

Is DTC P1571:64 retrieved again?

Yes	No
Go to I5.	The system is operating correctly at this time. The DTC may have been set due to an incorrectly installed stoplamp switch.

I5: REVIEW THE RECORDED DTCS FROM THE ABS SELF-TEST

Review the recorded DTCs from the ABS self-test.

Is DTC U3003:16 or U3003:17 present?

Yes	No
For DTC U3003:16, Go to PINPOINT TEST A . For DTC U3003:17, Go to PINPOINT TEST F .	Go to I6.

I6: RETRIEVE THE DTCS) FROM THE PCM SELF-TEST

Carry out the PCM KOEO self-test.

Is DTC P0562 or P0563 present?

Yes	No
DIAGNOSE the PCM DTC. REFER to ELECTRONIC ENGINE CONTROLS SYSTEM - 3.5L ECOBOOST (235KW/320PS) , ELECTRONIC ENGINE CONTROLS SYSTEM - 3.7L DURATEC (199KW/270PS) or ELECTRONIC ENGINE CONTROLS SYSTEM - 3.2L DURATORQ-TDCI (148KW/200PS) - PUMA .	Go to I7.

I7: CHECK FOR LOST COMMUNICATION DTC SET IN OTHER MODULES

Retrieve the continuous memory DTCs.

Is DTC P1571:64, U0100:xx, U0101:xx, U401:xx or U402:xx set in other modules in addition to the ABS module?

Yes	No
CHECK OASIS for any applicable Technical Service Bulletins TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to the appropriate ELECTRONIC ENGINE CONTROLS SYSTEM - 3.5L ECOBOOST (235KW/320PS) , ELECTRONIC ENGINE CONTROLS SYSTEM - 3.7L DURATEC (199KW/270PS) or ELECTRONIC ENGINE CONTROLS SYSTEM - 3.2L DURATORQ-TDCI (148KW/200PS) - PUMA .	INSTALL a new ABS module. CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module. REFER to the ABS module Removal and Installation procedure in ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL . ORDER a replacement ABS module and INCLUDE the RVC form. If this is a Ford repair, INCLUDE the RVC on the warranty claim form. When complete, SELECT the "X" in the top right corner to CLOSE this procedure.

Yes

CHECK OASIS for any applicable Technical Service Bulletins TSBs.

If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.

If no TSBs address this concern, INSTALL a new PCM. REFER to the appropriate ELECTRONIC ENGINE CONTROLS SYSTEM - 3.5L ECOBOOST (235KW/320PS) , ELECTRONIC ENGINE CONTROLS SYSTEM - 3.7L DURATEC (199KW/270PS) or ELECTRONIC ENGINE CONTROLS SYSTEM - 3.2L DURATORQ-TDCI (148KW/200PS) - PUMA .

INSTALL a new ABS module.

CHECK OASIS for any applicable TSBs.

If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.

If no TSBs address this concern, INSTALL a new ABS module. REFER to the ABS module Removal and Installation procedure in ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .

ORDER a replacement ABS module and INCLUDE the RVC form.

If this is a Ford repair, INCLUDE the RVC on the warranty claim form.

When complete, SELECT the "X" in the top right corner to CLOSE this procedure.