P1575

CIRCUIT DESCRIPTION
This diagnostic test functions on the assumption that a sudden decrease in rear wheel speed must be caused by a brake application. 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 non-drive wheel speed in 0.4 second and a transition of the torque converter clutch (TCC) contacts at the TCC brake switch or stop lamp switch without a transition of the extended travel contacts of the TCC brake, DTC P1575 is set.

CONDITIONS FOR RUNNING THE DTC
^ The traction control system and the antilock brake system have not failed
^ The traction control system and the antilock brake system are not active.
^ The non-drive wheel speed exceeds 32 km/h (20 mph) and then does not decrease to less than 6.5 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 TCC brake switch or 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 PCM disables cruise control.
^ The PCM will set the extended travel brake switch status to not applied.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The PCM will command a message to be displayed, if applicable.
^ The PCM may record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records.

CONDITIONS FOR CLEARING THE MESSAGE/DTC
^ The PCM will turn the message OFF after one run and pass of the diagnostic test.
^ A History DTC will clear after 40 consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ Use a scan tool in order to clear the DTCs.

TEST

Steps 1-15: