DTC P0724 V6
DTC Description
This diagnostic procedure supports DTC P0724 Brake Switch Circuit Low Voltage.
Circuit Description
The transmission control module receives a direct input from the stop lamp switch assembly. When the brake pedal is pressed, 12V is supplied to the TCM through connector A112-X1 pin 42.
When the TCM detects an open or short to ground on the stop lamp signal circuit during stopping then DTC P0724 sets. DTC P0724 is a type C DTC.
Refer to Automatic Transmission Controls Schematics , Automatic Transmission Inline 20-Way Connector End View , Automatic Transmission Internal Connector End Views , Automatic Transmission Control Module Connector End Views , and Automatic Transmission Related Connector End Views to aid in diagnosis. to aid in diagnosis.
Conditions for Running the DTC
| • | No DTCs P0719, P0722 or P0723. |
| • | The vehicle speed is greater than 40 km/h for 7 seconds, then 8-40 km/h for 5 seconds, then less than 8 km/h. |
| • | Continuously eight times once the previous criteria have been met. |
Conditions for Setting the DTC
The TCM detects an open or short to ground on the stop lamp switch signal circuit when the circuit should be high, battery voltage.
Action Taken When the DTC Sets
| • | The TCM does not request the engine control module (ECM) to illuminate the check powertrain icon. |
| • | The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM records this information as a Failure Record. |
| • | The TCM stores DTC P0724 in TCM history. |
Conditions for Clearing the DTC
| • | The TCM clears the DTC from TCM history if the vehicle complete 40 warm-up cycles without a non-emission related diagnostic fault occurring. |
| • | Tech 2 can clear the DTC. |
Diagnostic Aids
| • | Verify the brake pedal position sensor is adjusted properly, refer to Stop Lamp Switch Testing. |
| • | Test drive the vehicle if a switch or circuit condition cannot be located. An intermittent condition may be duplicated during a test drive. |
Test Description
The following numbers refer to the step numbers in the diagnostic table:
3 Checks if the stop lamp switch is serviceable.
4 Checks if there is a stop lamp switch signal to the TCM.
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
1 | Has the Diagnostic System Check been performed? | Go to Step 2 | |||||||
2 |
Does the Stop Lamp Pedal Switch parameter indicate Active? | Check for an intermittent fault in the circuit, refer to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||
3 | Test the stop lamp switch assembly, refer to Stop Lamp Switch Testing. Is the stop lamp switch assembly serviceable? | Go to Step 4 | Replace the stop lamp switch assembly. Refer to Stop Lamp Switch Replacement | ||||||
4 |
Does the multimeter display battery voltage? | Go to Step 5 | Repair or replace circuit 20 Go to Step 6 | ||||||
5 | Replace the TCM, refer to Transmission Control Module Replacement. Did you complete the replacement? | Go to Step 6 | -- | ||||||
6 | Perform the following procedure in order to verify the repair:
Has DTC P0724 set? | Go to Step 2 | Go to Step 7 | ||||||
7 | On Tech 2 select: Diagnostic Trouble Codes/Read DTC Information. Does Tech 2 display any DTCs you have not diagnosed? | System OK | |||||||
When all diagnosis and repairs are completed, check the system for correct operation. | |||||||||
