For 1990-2009 cars
Master Electrical Component List
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Control Module References

### Circuit Description

The brake switch indicates brake pedal status to the powertrain control module (PCM). The brake switch is a normally-closed switch that supplies battery voltage on the torque converter clutch (TCC) brake switch signal circuit to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. If the PCM receives a zero voltage signal at the brake switch input, and the TCC is engaged, the PCM de-energizes the TCC solenoid valve. The PCM disregards the brake switch input for TCC scheduling if there is a brake switch circuit fault.

When the PCM detects an open brake switch circuit, 0 volts, low input, during accelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0719 TCC Brake Switch Circuit Low Voltage

### Conditions for Running the DTC

• | No vehicle speed sensor (VSS) DTCs P0502 or P0503.

• | TCC Brake switch status is open and DTC P0719 has not passed.

• | Engine is running greater than 5 seconds.

### Conditions for Setting the DTC

The PCM detects an open TCC brake switch or circuit, 0 volts, for 15 minutes without changing for 2 seconds, and the following events occur 8 times:

• | The vehicle speed is less than 8 km/h (5 mph);

• | then the vehicle speed is 8-32 km/h (5-20 mph) for 3 seconds;

• | then the vehicle speed is greater than 32 km/h (20 mph) for 7 seconds.

### 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 P0719 in PCM history.

### Conditions for Clearing the DTC

• | A scan tool can clear the 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.

### Diagnostic Aids

• | Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0719.

• | It may be necessary to also clear this DTC from the engine control module (ECM).

### Test Description

The number below refers to the step number on the diagnostic table.

1. This step isolates the TCC brake switch as a source for setting the DTC.

#### DTC P0719

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.

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 powertrain control module (PCM).

3. Record the DTC Failure Records.
4. Clear the DTC.
5. Select TCC Brake Switch on the scan tool.

Caution: Refer to SIR Caution in the Preface section.

6. Disconnect the TCC brake switch connector from the TCC brake switch.
7. Connect a test lamp from ignition voltage circuit of the TCC brake/cruise release switch connector to ground.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 4

3 | Connect a fused jumper wire between the ignition voltage circuit and the TCC brake switch/cruise control release signal circuit of the TCC brake switch connector. Did the TCC Brake Switch parameter status on the scan tool change from Open to Closed? | -- | Go to Step 7 | Go to Step 9
4 | Inspect the CRUISE fuse for an open. Refer to Circuit Protection - Fuses . Is the fuse open? | -- | Go to Step 5 | Go to Step 8
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 ignition voltage circuit of the brake/cruise release 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 11

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 signal circuit of the TCC 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 11

Go to Step 10

7 | Replace the TCC brake/cruise release switch. Refer to Stop Lamp Switch Replacement . Did you complete the replacement? | -- | 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 ignition voltage circuit of the brake/cruise release switch for an open. Refer to Testing for Continuity and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 11

--

9 | 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 signal circuit of the brake/cruise release switch for an open. Refer to Testing for Continuity and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

10 | Replace the PCM. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 11 | --
11 | Perform the following procedure in order to verify the repair:

1. Select DTC.
2. Select Clear Info.
3. Turn ON the ignition, with the engine OFF.
4. Apply and release the brake pedal.
5. Verify that the scan tool TCC Brake Switch parameter status indicates Closed, 12 volts, for 5 seconds.
6. Select Specific DTC.
7. Enter DTC P0719.

Has the test run and passed?

--

Go to Step 12

Go to Step 2

12 | 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 - Vehicle | System OK