DTC P0724 Gas
Circuit Description
The TCC Brake switch indicates the brake pedal status. The normally closed brake switch supplies a B+ signal to the powertrain control module (PCM). The signal voltage circuit opens when the brakes are applied.
If the PCM detects a closed TCC Brake switch during decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.
Conditions for Running the DTC
| • | No AT VSS DTC P0502 or P0503. |
| • | The following sequence of events occurs 10 consecutive times: |
| 1. | The vehicle speed is greater than 40 km/h (25 mph) for 7 seconds. |
| 2. | Then the vehicle speed is 8-40 km/h (5-25 mph) for 2.5 seconds. |
| 3. | Then the vehicle speed is less than 8 km/h (5 mph). |
Conditions for Setting the DTC
| • | All conditions are met for 10 occurrences. |
| • | The PCM detects a closed TCC Brake switch circuit, 12 volts, during decelerations. |
Action Taken When the DTC Sets
| • | The PCM does not illuminate the malfunction indicator lamp (MIL). |
| • | 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 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
Inspect the brake switch for proper mounting and operation.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 4.3L or Diagnostic System Check - Engine Controls in Engine Controls - 5.0/5.7L or Diagnostic System Check - Engine Controls in Engine Controls - 8.1L |
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM. Caution: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs. Did the TCC Brake switch status change from CLOSED to OPEN? | -- | Go to Intermittent Conditions in Engine Controls - 4.3L or Intermittent Conditions in Engine Controls - 5.0/5.7L or Intermittent Conditions in Engine Controls - 8.1L | Go to Step 3 |
Did the TCC Brake switch status change from CLOSED to OPEN? | -- | Go to Step 4 | Go to Step 5 | |
4 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement? | -- | Go to Step 7 | -- |
5 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution. Test the TCC brake switch signal circuit (CKT 420) for a short to voltage. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
6 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.3L or Powertrain Control Module Replacement in Engine Controls - 5.0/5.7L or Powertrain Control Module Replacement in Engine Controls - 8.1L. Did you complete the replacement? | -- | Go to Step 7 | -- |
7 | Perform the following procedure in order to verify the repair:
Does the scan tool TCC Brake switch status change from CLOSED to OPEN? | -- | System OK | Go to Step 1 |
DTC P0724 Diesel
Circuit Description
The normally open TCC Brake 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 AT VSS sensor DTCs P0722 or P0723 |
| • | The PCM detects a closed TCC Brake 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 Brake 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 Brake switch state if the APP sensor is greater than 0.5 percent 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 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
| • | Ask about the customer 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 operation. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 6.5L |
Important: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM. Did the scan tool TCC Brake Switch status change from Closed to Open? | -- | Go to Step 3 | Go to Step 4 | |
3 | Replace the TCC Brake switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement? | -- | Go to Step 6 | -- |
4 | Test the lamp switch signal circuit (CKT 17) of the TCC Brake switch for a short to voltage between the PCM connector C2-B10 and the TCC/Stoplamp switch connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 5 |
5 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 6.5L. Did you complete the replacement? | -- | Go to Step 6 | -- |
6 | Perform the following procedure to verify the repair:
Does the scan tool TCC Brake switch state change, when the pedal is depressed? | -- | System OK | Go to Step 1 |
