Workshop Manual

6E–493
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1571 Brake Switch No Operation
060R200067
Circuit Description
The brake switch has 3 functions.
B Brake pedal operation check
B Brake light operation (On and off)
B Cruise control (Cancel)
The PCM receives vehicle speed and switch position
signals from the brake switch. The PCM sets brake
operating conditions in response to these signals.
If the brake switch is on, the brake system is in normal
operation (cruise control cancelled).
Conditions for Setting the DTC
B Two break switch signals do not acknowledge after
signal changed.
B Switch does not change during accelerating vehicle or
decelerating.
B VSS is not fault.
B Engine is running.
Action Taken When the DTC Sets
B The PCM will not turn the malfunction indicator lamp
(MIL) “ON”.
B The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the DTC
B DTC P1571 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the PCM
battery feed.
Diagnostic Aids
B Damaged harness–Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
fuel level display on the scan tool while moving
connectors and wiring harnesses related to the sensor.
A change in the display will indicate the location of the
fault.