Pinpoint Test C : P0504, P0572, P0573 Or P1703

WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 CHECK THE OPERATION OF THE STOPLAMPS
- Ignition ON.
- Operate the stoplamps.
Do the stoplamps and high mounted stoplamp operate correctly?

Yes GO to C2

No REFER to: Stoplamps .

C2 CHECK THE STOPLAMP SWITCH (BOO1) AND CRUISE CONTROL DEACTIVATOR SWITCH (BOO2) PARAMETER IDENTIFICATIONS (PIDS)

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

Using the table, monitor the Parameter Identifications (PIDs) BOO1 (stoplamp switch) and BOO2 (cruise control deactivator switch) while applying and releasing the brake pedal.

Brake Pedal Position	BOO1 PID	BOO2 PID
Released	Off	Off
Applied lightly	On	Off
Applied firmly	On	On

Do the PID values agree with the brake pedal position?

Yes

GO to C8

No	For an incorrect BOO1 PID value, GO to C3 For an incorrect BOO2 PID value, GO to C4

C3 CHECK THE STOPLAMP SWITCH CIRCUIT

Ignition OFF.

Disconnect: PCM C1381B (2.0L GTDI), C1551B (2.7L GTDI) or C175B (3.5L TiVCT).

Ignition ON.

While applying and releasing the brake pedal, measure:

2.0L GTDI

Positive Lead	Measurement / Action	Negative Lead
C1381B-66	Courtesy of FORD MOTOR COMPANY	Ground

2.7L GTDI

Positive Lead	Measurement / Action	Negative Lead
C1551B-66	Courtesy of FORD MOTOR COMPANY	Ground

3.5L TiVCT

Positive Lead	Measurement / Action	Negative Lead
C175B-67	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts with the brake pedal applied and no voltage with the brake pedal released?

Yes

GO to C8

No	REPAIR the circuit.

C4 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION

Ignition OFF.

Disconnect: PCM C1381B (2.0L GTDI), C1551B (2.7L GTDI) or C175B (3.5L TiVCT).

While firmly applying and releasing the brake pedal, measure:

2.0L GTDI

Positive Lead	Measurement / Action	Negative Lead
C1381B-65	Courtesy of FORD MOTOR COMPANY	Ground

2.7L GTDI

Positive Lead	Measurement / Action	Negative Lead
C1551B-65	Courtesy of FORD MOTOR COMPANY	Ground

3.5L TiVCT

Positive Lead	Measurement / Action	Negative Lead
C175B-66	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms with the brake pedal released, and greater than 10, 000 ohms with the brake pedal firmly applied?

Yes

GO to C8

GO to C5

C5 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN

Disconnect: BPP switch C278.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C278-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to C6

No	REPAIR the circuit.

C6 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C278-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to C7

No	REPAIR the circuit.

C7 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
C278-2	Courtesy of FORD MOTOR COMPANY	C278-3

Measure:

2.0L GTDI

Positive Lead	Measurement / Action	Negative Lead
C1381B-65	Courtesy of FORD MOTOR COMPANY	Ground

2.7L GTDI

Positive Lead	Measurement / Action	Negative Lead
C1551B-65	Courtesy of FORD MOTOR COMPANY	Ground

3.5L TiVCT

Positive Lead	Measurement / Action	Negative Lead
C175B-66	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	INSTALL a new BPP switch. REFER to: Stoplamp Switch .

No	REPAIR the signal circuit for an open.

C8 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors and related in-line connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the PCM connectors and related in-line connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, Refer to PCM GUIDED ROUTINE TESTING

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.