P1575
CIRCUIT DESCRIPTIONThis diagnostic test functions on the assumption that a sudden decrease in non-drive 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 in 0.4 seconds and a transition of the TCC contacts at the TCC/Brake switch or stop lamp switch without a transition of the extended travel contacts of the TCC/Brake switch, DTC P1575 is set.
CONDITIONS FOR RUNNING THE DTC
^ P1574 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 6 mph or more decrease in non-drive wheel speed in 0.4 seconds and the TCC/Brake switch or stop lamp 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.
^ 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 forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ Use a scan tool to clear DTCs.
DIAGNOSTIC AIDS
This DTC is difficult to set. The most probable cause of setting this DTC is a "panic" stop situation. If the condition is intermittent, refer to Testing for Intermittent and Poor Connections in Diagrams.
TEST
Steps 1-4:
Steps 5-13:
