P1575
CIRCUIT DESCRIPTIONThis diagnostic test functions on the assumption that a sudden decrease in the non-drive (rear) wheel speed must be caused by a brake application. Non-drive wheel speed and stop lamp switch status are supplied to the PCM through serial data from the Electronic Brake And Traction Control Module (EBCM). If there is a 6 mph or more decrease of non-drive wheel speed during 0.4 second, and a transition of the Torque Converter Clutch (TCC) contacts at the TCC brake switch or at the stop lamp switch without a transition of the extended travel contacts of the TCC brake, DTC P1575 is set.
CONDITIONS FOR RUNNING THE DTC
^ DTC P1574 is not set.
^ The traction control and antilock brake systems have not failed.
^ The traction control and antilock brake systems are not active.
^ The non-drive wheel speed goes above 32 km/h ( 20 mph) and then does not go below 6 km/h ( 4 mph).
CONDITIONS FOR SETTING THE DTC
A 10 km/h (6 mph) or more decrease in non-drive wheel speed in 0.4 second and TCC brake switch or Stop/BTS I/Cruise brake switch indicating brakes applied and no transition is noticed in the extended travel contacts of the TCC brake switch indicating brakes applied.
ACTION TAKEN WHEN THE DTC SETS
^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
^ A current DTC Last Test Failed clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.
DIAGNOSTIC AIDS
If the condition is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions
TEST
