Operation CHARM: Car repair manuals for everyone.

P0719








CIRCUIT DESCRIPTION

The Torque Converter Clutch (TCC) brake switch reports brake pedal status to the Powertrain Control Module (PCM). The brake switch indicates that the brake pedal is either applied or released. The normally closed switch supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the brake switch, interrupting voltage to the PCM. When the PCM receives 0 volts at the brake switch input, the PCM turns OFF the TCC Solenoid Valve.

When the PCM detects an open brake switch (stuck ON) during acceleration, then DTC P0719 sets. DTC P0719 is a type D DTC.


CONDITION FOR SETTING THE DTC

^ No Vehicle Speed Sensor (VSS) DTC P0502.

^ The vehicle speed is less than 8 km/h (5 mph).

^ Accelerate the vehicle to 32 km/h (20 mph) taking 4 seconds.

^ The vehicle speed remains above 32 km/h (20 mph) for 6 seconds.

^ The above conditions must occur 7 times with the brake switch ON for more than 15 minutes, and the PCM receiving no voltage input for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM requires a throttle angle greater than 6% and a vehicle speed greater than 75 km/h (47 mph) in order to apply the TCC.

^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).


CONDITIONS FOR CLEARING THE DTC

^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.


DIAGNOSTIC AIDS

^ Ensure that the TCC brake switch is properly adjusted.

^ Check the PCM calibration for a current update.

^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring at the transmission 7-way connector. Look for the following conditions:

- A bent terminal

- A backed out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. If DTCs P1651 and P1652 are also set, then the FAN/ALT fuse is open.

5. This Step isolates the fault between the TCC Brake Switch and the harness.