P0724

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The normally open TCC stoplamp switch indicates brake pedal status to the Powertrain Control Module (PCM). Applying the brake pedal closes the switch, supplying voltage to the PCM. Releasing the brake pedal interrupts voltage to the PCM.
If the PCM detects a closed TCC Stoplamp switch (Stuck ON) during accelerations, then DTC P0724 sets. DTC P0724 is a type D DTC.

CONDITIONS FOR SETTING THE DTC
1. No Output Speed Shaft (OSS) Sensor DTCs P0722 or P0723.
2. The PCM detects a closed TCC stoplamp switch or circuit, and the following sequence of events occurs eight consecutive times:
- The vehicle speed is greater than 32 km/h (20 mph) for 6 seconds.
- The vehicle speed is 8-32 km/h (5-20 mph) for 3.1 seconds.
- The vehicle speed is less than 8 km/h (5 mph).
3. DTC P0724 has not passed.

ACTION TAKEN WHEN THE DTC SETS
^ For TCC scheduling, the PCM disregards the brake switch state it the APP Sensor is greater than 12% and the vehicle speed is greater than 30 mph.
^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).

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

DIAGNOSTIC AIDS
^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the TCC brake switch. Look for the following problems:
- A bent terminal.
- A backed out terminal.
- A damaged terminal.
- Poor terminal tension.
- A chafed wire.
- A broken wire inside the insulation.
^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ Ask about the customer's driving habits and any unusual driving conditions he or she might have, such as stop and go traffic or expressway driving.
^ Inspect the brake switch for proper mounting and adjustment.
^ First diagnose and clear any engine DTCs that are present. Then inspect for any transmission DTCs that may have reset.

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.