Pinpoint Test B : P0504, P0572, P0573 Or P1703
WARNING: This page is about a different car, the 2018 Lincoln Navigator. 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.
- B1 CHECK THE OPERATION OF THE STOPLAMPS
- Ignition ON.
- Operate the stoplamps.
Do the stoplamps and high mounted stoplamp operate correctly?
Yes GO to B2 No REFER to: Stoplamps . - B2 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 B8 No For an incorrect BOO1 PID value, GO to B3For an incorrect BOO2 PID value, GO to B4 - B3 CHECK THE STOPLAMP SWITCH CIRCUIT
- Ignition OFF.
- Disconnect PCM C1951B .
- Ignition ON.
- While applying and releasing the brake pedal, measure:
Positive Lead Measurement / Action Negative Lead C1951B-48 Ground
Is the voltage greater than 11 volts with the brake pedal applied and no voltage with the brake pedal released?
Yes GO to B8 No REPAIR the circuit. - B4 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION
- Ignition OFF.
- Disconnect PCM C1951B .
- While firmly applying and releasing the brake pedal, measure:
Positive Lead Measurement / Action Negative Lead C1915B-28 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 B8 No GO to B5 - B5 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN
- Disconnect BPP switch C278 .
- Measure:
Positive Lead Measurement / Action Negative Lead C278-3 Ground
Is the resistance less than 3 ohms?
Yes GO to B6 No REPAIR the circuit. - B6 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Measure:
Positive Lead Measurement / Action Negative Lead C278-2 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to B7 No REPAIR the circuit. - Measure:
- B7 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN
- Measure:
Positive Lead Measurement / Action Negative Lead C1915B-28 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. - Measure:
- B8 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect all PCM 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. 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 service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to PCM GUIDED ROUTINE TESTING -- NAVIGATOR . 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.