P1575

DTC P1575

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 a normally closed switch. When the extended travel brake switch is closed, the engine control module (ECM) detects ignition voltage on the extended travel brake switch signal circuit.

If the ECM detects voltage on the extended travel brake switch signal circuit when the extended travel brake switch should be open, this DTC sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P1575 Extended Travel Brake Switch Failure

CONDITIONS FOR RUNNING THE DTC
- The engine speed is greater than 700 RPM.
- The engine has been operating longer than 2 seconds.
- The wheel speed must be greater than 30 mph in order to enable the diagnostic. The diagnostic will disable when the wheel speed is below 10 mph.
- The vehicle speed is decreasing at a rate greater than 2.6 mph over a 250 millisecond period.

CONDITIONS FOR SETTING THE DTC
- The ECM detects voltage on the extended travel brake switch circuit when the extended travel brake switch should be open.
- The above condition is present for 1.5 seconds.

DIAGNOSTIC AIDS
An improperly adjusted extended travel brake switch may cause this DTC to set. In order to avoid misdiagnosis, verify that the extended travel brake switch is properly adjusted. Refer to Stop Lamp Switch Adjustment in Lighting Systems.

TEST

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