P0724

Diagnostic Chart:

Schematic:

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 C DTC.

CONDITIONS FOR RUNNING THE DTC
^ No OSS sensor DTCs P0722 or P0723
^ The PCM detects a closed TCC/Stoplamp switch or circuit, and the following sequence of events occur:
1. The vehicle speed is less than 8 km/h (5 mph).
2. The vehicle speed is 8-32 km/h (5-20 mph) for 3.1 seconds.
3. The vehicle speed is greater than 32 km/h (20 mph) for 7 seconds.
^ DTC P0724 has not passed.

CONDITIONS FOR SETTING THE DTC
^ The TCC Stoplamp switch is closed for 900 seconds (15 minutes).
^ All conditions are met for eight occurrences.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
^ For TCC scheduling, the PCM disregards the TCC/Stoplamp switch state if the APP sensor is greater than 0.5% and the vehicle speed is greater than 40 Km/h (25 mph).
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
^ The PCM stores DTC P0724 in PCM history.

CONDITIONS FOR CLEARING THE DTC
^ A scan tool clears the DTC from PCM history.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 consecutive warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS
^ First diagnose and clear any engine DTCs that are present. Then inspect for any transmission DTCs that may have reset.
^ 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.
^ Inspect the connectors at the PCM, the TCC/Stoplamp switch and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Diagrams.

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