DTC P0719 4.8L and 6.0L
Circuit Description
The torque converter clutch (TCC) brake switch indicates the brake pedal status. The normally closed TCC 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 an open TCC brake switch circuit during accelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0719 Brake Switch Circuit Low Voltage
Conditions for Running the DTC
| • | No VSS DTCs. |
| • | The ignition switch is in the ON position. |
| • | The system voltage is 8-18 volts. |
Conditions for Setting the DTC
DTC P0719 sets if the PCM detects an open brake switch or circuit, 0 volts, during vehicle acceleration and the following conditions occur eight times:
| • | The vehicle speed is less than 8 km/h (5 mph). |
| • | Then, the vehicle speed is 8-40 km/h (5-25 mph) for 1.7 seconds. |
| • | Then, the vehicle speed is greater than 40 km/h (25 mph) for 7 seconds. |
Action Taken When the DTC Sets
| • | The PCM does not illuminate the malfunction indicator lamp (MIL). |
| • | For TCC scheduling, the PCM disregards the brake switch state if the TP sensor is 1.5 percent or greater and the vehicle speed is 32 km/h (20 mph) or greater. |
| • | 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 P0719 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 DTC passes. |
Diagnostic Aids
Inspect the brake switch for proper mounting and operation.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for TCC brake switch voltage to the PCM connector.
-
This step isolates the TCC brake switch as a source for setting the DTC.
-
This step tests for a short to ground in the voltage circuit to the TCC brake switch.
-
This step tests for a short to ground in the TCC brake switch circuit, from the TCC brake switch to the PCM.
-
This step isolates the PCM as a source for causing the fuse to open.
Step | Action | Value | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
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: Refer to SIR Caution in the Preface section. Does the scan tool TCC Brake Switch indicate CLOSED, when the brake pedal is not applied? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||
3 |
Is the fuse open? | -- | Go to Step 10 | Go to Step 4 | ||||||
Does the test lamp illuminate? | -- | Go to Step 15 | Go to Step 5 | |||||||
5 |
Does the voltage measure within the specified value? | 10-13 V | Go to Step 7 | Go to Step 6 | ||||||
6 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the Ignition E voltage circuit for an open. Did you find and correct the condition? | -- | Go to Step 16 | -- | ||||||
Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 8 | |||||||
8 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the TCC brake switch circuit for an open. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | -- | ||||||
9 | Replace the TCC Brake switch. Refer to Stop Lamp Switch Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
Does the fuse open with the brake pedal applied? | -- | Go to Step 11 | Go to Step 12 | |||||||
11 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the Ignition E voltage circuit for a short to ground. Refer to Testing for a Short to Voltage and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | -- | ||||||
With the key in the RUN position, release the brake pedal. Does the fuse open when the brake pedal is released? | -- | Go to Step 13 | Go to Testing for Intermittent Conditions and Poor Connections | |||||||
Does the fuse open? | -- | Go to Step 14 | Go to Step 15 | |||||||
14 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the TCC brake switch circuit for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | -- | ||||||
15 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
16 | Perform the following procedure in order to verify the repair:
Does the TCC Brake Switch indicate CLOSED when the brake pedal is not applied, then indicate OPEN when the brake pedal is applied? | -- | Go to Step 17 | Go to Step 2 | ||||||
17 | 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? | -- | System OK |
DTC P0719 6.6L
Circuit Description
The stop lamp switch indicates the brake pedal status to the transmission control module (TCM). The brake switch is a normally-closed switch that supplies battery voltage on the stop lamp supply voltage circuit to the TCM. Applying the brake opens the stop lamp switch, interrupting voltage to the TCM. When the brake is released, the TCM receives a constant voltage signal input. If the TCM receives a 0 voltage signal input at the stop lamp supply voltage circuit, and the torque converter clutch (TCC) is engaged, the TCM de-energizes the TCC solenoid valve. The TCM disregards the brake switch input for TCC scheduling if there is a brake switch circuit fault.
When the TCM detects an open circuit in the brake switch or brake switch wiring during decelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0719 Brake Switch Circuit Low Voltage
Conditions for Running the DTC
| • | No Brake Switch DTC P0719. |
| • | No OSS DTCs P0722 or P0723. |
| • | The system voltage is 8-18 volts. |
| • | The TCM detects the brake switch is OFF. |
| • | The vehicle speed 32 km/h (20 mph) or greater for 6 seconds, then is between 40 km/h (25 mph) and 8 km/h (5 mph) for 4.75 seconds, then the vehicle speed is less than 8 km/h (5 mph) for 2 seconds, continuously 8 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 8 times during decelerations.
Action Taken When the DTC Sets
| • | The TCM does not request the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL). |
| • | 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 P0719 in TCM history. |
Conditions for Clearing the DTC
| • | A scan tool can clear the 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. |
Diagnostic Aids
| • | Inspect the brake switch for proper mounting and operation. |
| • | Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0719. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Important: Before clearing the DTC, use the scan tool in order to record the ECM and TCM Failure Records. Using the Clear Info function erases the Failure Records from the ECM and TCM. Caution: Refer to SIR Caution in the Preface section. Does the test lamp illuminate? | Go to Step 3 | Go to Step 4 |
Connect a fused jumper wire between the battery positive voltage supply and stop lamp supply voltage signal circuits of the stop lamp switch connector. Did the TCC Brake Switch status on the scan tool change from Open to Closed? | Go to Step 9 | Go to Step 7 | |
4 | Inspect the stop lamp fuse for an open. Refer to Circuit Protection - Fuses . Is the fuse open? | Go to Step 5 | Go to Step 10 |
5 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the battery positive voltage circuit of the brake switch for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 6 |
6 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the stop lamp supply voltage signal circuit of the brake switch for a short to ground between the stop lamp switch and the fuse block-body. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
7 | Inspect the STOP/CHMSL fuse for an open. Refer to Circuit Protection - Fuses . Is the fuse open? | Go to Step 8 | Go to Step 11 |
8 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the stop lamp supply voltage signal circuit for a short to ground between the fuse block-body and TCM. Did you find and correct the condition? | Go to Step 13 | -- |
9 | Replace the brake switch. Refer to Stop Lamp Switch Replacement . Did you complete the replacement? | Go to Step 13 | -- |
10 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the battery positive voltage circuit of the brake switch for an open. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | -- |
11 |
Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution. Test the stop lamp supply voltage signal circuit of the brake switch for an open between the stop lamp switch and the fuse block-body or between the fuse block-body and TCM. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
12 | Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | -- |
13 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | Go to Step 14 | Go to Step 2 |
14 | 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? | System OK |
