P1575

Schematic:

CIRCUIT DESCRIPTION

This diagnostic test functions on the assumption that a brake application causes a sudden decrease in non-drive wheel speed. The extended travel brake switch is normally closed. When the extended travel brake switch is closed, the Powertrain Control Module (PCM) senses ignition voltage on the extended travel brake switch signal circuit. If the PCM senses a voltage on the extended travel brake switch signal circuit when the switch should be open, this DTC sets.

CONDITIONS FOR RUNNING THE DTC
^ The engine speed is more than 700 RPM.
^ The engine has been operating for more than 2 seconds.
^ The wheel speed must be more than 30 MPH in order to enable the diagnostic. The diagnostic will disable when the wheel speed is less than 10 MPH.
^ The vehicle speed is decreasing at a rate of more than 10.4 MPH over a one second period.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects voltage on the extended travel brake switch circuit when the switch should be open.
^ The above conditions are present for 1.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS

IMPORTANT: Remove any debris from the component module connector surfaces before servicing the component module. Inspect the component module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the components modules.

In order to adjust the extended travel brake switch perform the following procedure:
1. With the brake pedal depressed, insert the brake lamp switch into the retainer until the switch body seats in the retainer. You can hear clicks as you push the threaded portion of the switch through the retainer.
2. Slowly pull the brake pedal fully rearward against the stop until you can no longer hear the clicks.


TEST DESCRIPTION

Diagnostic Chart:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the fault is present.
4. This step checks for the CKT shorted to B+.
9. This DTC will not report a pass. The scan tool status for this DTC will never report a pass. The scan tool will only display when the diagnostic fails. The repair is not complete if the scan tool indicates that the diagnostic ran and failed.