DTC P0724 2.2L (L61)
Circuit Description
The brake switch indicates brake pedal status to the PCM. The normally-open brake switch supplies ignition voltage to the PCM. Applying the brake pedal closes the switch, supplying voltage to the PCM. Releasing the brake pedal interrupts voltage to the PCM. When the PCM senses ignition voltage at the brake switch input, the PCM de-energizes the torque converter clutch (TCC) solenoid valve.
When the PCM detects an open brake switch, stuck OFF, during decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.
Conditions for Running the DTC
No VSS DTCs P0502 or P0503.
Conditions for Setting the DTC
DTC P0724 sets if the PCM detects an open switch or circuit, 0 volts, during vehicle deceleration and the following conditions occur eight times:
| • | The vehicle speed is greater than 32 km/h (20 mph) for 6 seconds; |
| • | then, the vehicle speed is 8-32 km/h (5-20 mph) for 3 seconds; |
| • | then, the vehicle speed is less than 8 km/h (5 mph). |
Action Taken When the DTC Sets
| • | The PCM does not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM illuminates the service vehicle soon (SVS) lamp. |
| • | 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 SVS Lamp/DTC
| • | The PCM turns OFF the SVS lamp when the condition no longer exists. |
| • | A scan tool can clear the SVS Lamp/DTC. |
| • | 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 DTC passes. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Disconnecting the brake switch connector, jumping the circuit, and observing a status change, isolates the brake switch as the source of the DTC.
-
If the ignition 1 voltage circuit shorts to ground, the BRAKE fuse opens.
-
If the brake switch is properly adjusted, then the brake switch must be replaced.
-
Replace the PCM only after you have completed the preceding diagnostic steps.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 2.2L (L61) | ||||||
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 brake switch status change from Released to Applied? | -- | Go to Step 5 | Go to Step 3 | |||||||
Refer to Circuit Protection - Fuses in Wiring Systems. Is the fuse open? | -- | Go to Step 4 | Go to Step 6 | |||||||
4 |
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 ignition 1 voltage circuit (CKT 540) of the brake switch for a short to a ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | -- | ||||||
Refer to Stop Lamp Switch Adjustment in Lighting Systems. Did the brake switch require adjustment? | -- | Go to Step 9 | Go to Step 7 | |||||||
6 |
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 9 | Go to Step 8 | ||||||
7 | Replace the brake switch. Refer to Stop Lamp Switch Replacement in Lighting Systems. Did you complete the replacement? | -- | Go to Step 9 | -- | ||||||
Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 2.2L (L61). Did you complete the replacement? | -- | Go to Step 9 | -- | |||||||
9 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 10 | Go to Step 2 | ||||||
10 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.2L (L61) | System OK |
DTC P0724 3.0L (L81)
Circuit Description
The brake switch indicates brake pedal status to the TCM. The normally-open brake switch supplies ignition voltage to the TCM. Applying the brake pedal closes the switch, supplying voltage to the TCM. Releasing the brake pedal interrupts voltage to the TCM. When the TCM senses ignition voltage at the brake switch input, the TCM de-energizes the torque converter clutch (TCC) solenoid valve.
When the TCM detects an open brake switch, stuck OFF, during decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.
Conditions for Running the DTC
No VSS DTCs P0502 or P0503.
Conditions for Setting the DTC
DTC P0724 sets if the TCM detects an open brake switch or circuit, 0 volts, for 15 minutes and the following conditions occur eight times:
| • | The vehicle speed is greater than 32 km/h (20 mph) for 4 seconds; |
| • | then, the vehicle speed is 8-32 km/h (5-20 mph) for 6 seconds; |
| • | then, the vehicle speed is less than 8 km/h (5 mph). |
Action Taken When the DTC Sets
| • | The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL). |
| • | The TCM requests the ECM to illuminate the service vehicle soon (SVS) lamp. |
| • | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records. |
| • | The TCM stores DTC P0724 in TCM history. |
Conditions for Clearing the SVS Lamp/DTC
| • | The TCM clears the SVS lamp request when the condition no longer exists. |
| • | A scan tool can clear the SVS Lamp/DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Disconnecting the brake switch connector, jumping the circuit, and observing a status change, isolates the brake switch as the source of the DTC.
-
If the ignition 1 voltage circuit shorts to ground, the BRAKE fuse opens.
-
If the brake switch is properly adjusted, then the brake switch must be replaced.
-
Replace the TCM only after you have completed the preceding diagnostic steps.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.0L (L81) | ||||||
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 TCM. Did the brake switch status change from Open to Closed? | -- | Go to Step 5 | Go to Step 3 | |||||||
Refer to Circuit Protection - Fuses in Wiring Systems. Is the fuse open? | -- | Go to Step 4 | Go to Step 6 | |||||||
4 |
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 ignition 1 voltage circuit (CKT 540) of the brake switch for a short to a ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | -- | ||||||
Refer to Stop Lamp Switch Adjustment in Lighting Systems. Did the brake switch require adjustment? | -- | Go to Step 9 | Go to Step 7 | |||||||
6 |
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 9 | Go to Step 8 | ||||||
7 | Replace the brake switch. Refer to Stop Lamp Switch Replacement in Lighting Systems. Did you complete the replacement? | -- | Go to Step 9 | -- | ||||||
Replace the TCM. Refer to Transmission Control Module Replacement Did you complete the replacement? | -- | Go to Step 9 | -- | |||||||
9 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 10 | Go to Step 2 | ||||||
10 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 3.0L (L81) | System OK |
