P0724

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The brake switch indicates the brake pedal status. The brake switch is normally-closed. The brake switch supplies a B+ signal on circuit 420 to the VCM. The signal voltage circuit is opened when you apply the brakes. The VCM uses this signal in order to de-energize the TCC Sol. Valve when you apply the brakes.
When the VCM detects a closed brake switch during decelerations, then DTC P0724 sets. DTC P0724 is a type D DTC.

CONDITIONS FOR SETTING THE DTC
^ No Vehicle Speed Sensor (VSS) Assy. DTC P0502.
^ The VCM detects a closed brake switch circuit (12 volts) without going on for 2 seconds and the following events occur seven consecutive times:
- The vehicle speed is greater than 32 km/h (20 mph) for 6 seconds;
- then the vehicle speed is between 832 km/h (520 mph) for 4 seconds;
- then the vehicle speed is less than 8 km/h (5 mph).

ACTION TAKEN WHEN THE DTC SETS
The VCM does not illuminate the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE DTC
^ A scan tool can clear the DTC from the VCM history. The VCM clears the DTC from the VCM history if the vehicle completes 40 warm-up cycles without a failure reported.
^ The VCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the VCM.

DIAGNOSTIC AIDS
^ Inspect the wiring for poor electrical connections at the VCM. Inspect the wiring for poor electrical connections at the brake switch. Look for the following conditions:
- A bent terminal.
- A backed out terminal.
- A damaged terminal.
- Poor terminal tension.
- A chafed wire.
- A broken wire inside the insulation.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step isolates the brake switch as a source for setting the DTC.