P1575

CIRCUIT DESCRIPTION
This diagnostic test functions on the assumption that a sudden decrease in non-drive (rear) wheel speed must be caused by a brake application. The non-drive wheel speed and stop lamp switch status are supplied to the Powertrain Control Module (PCM) through serial data from the Electronic Brake And Traction Control Module (EBCM). If there is a 10 km/h (6 mph) or more decrease of the non-drive wheel speed in 0.4 second, and a transition of the Torque Converter Clutch (TCC) contacts at the TCC brake switch or 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 the antilock brake systems have not failed.
^ The traction control and the 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 the non-drive wheel speed in 0.4 second, and the TCC brake switch or the Stop/BTSI/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. Intermittent Conditions

TEST

Steps 1-7:

Steps 8-18: