P0573

DTC P0573

CIRCUIT DESCRIPTION




The torque converter clutch (TCC)/Brake switch is a normally closed switch. When the TCC/Brake switch circuit is closed, brake pedal released, the engine control module (ECM) senses ignition voltage on the TCC Brake Switch/Cruise Control Release Signal circuit. If the ECM does not sense a voltage on the TCC Brake Switch/Cruise Control Release Signal circuit when the TCC/Brake switch should be closed, brake pedal released, this DTC sets.

CONDITIONS FOR RUNNING THE DTC
- Vehicle has cycled from 0-60 km/h (0-37 mph) 3 times in 1 ignition cycle.
- Continuous once the previous criteria have been met.

CONDITIONS FOR SETTING THE DTC
The ECM does not detect voltage on the TCC Brake Switch/Cruise Control Release Signal circuit when the switch should be closed, with the brake pedal released.

ACTION TAKEN WHEN THE DTC SETS
- The ECM stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.

CONDITIONS FOR CLEARING THE DTC
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC will clear 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

IMPORTANT:
- Verify that the TCC/Brake switch is adjusted properly. Refer to adjustment procedure.
- Test drive the vehicle if a switch or circuit condition cannot be located. An intermittent condition may be duplicated during a test drive.
- For an intermittent, Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1-7:

The number below refers to the step number on the diagnostic table.
2. This step determines if the fault is present.