With 4 Speed Automatic

P0719 WITH 4 SPEED AUTOMATIC

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The brake switch indicates brake pedal status to the Powertrain Control Module (PCM). The normally-Closed brake switch supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. Releasing the brake pedal resumes voltage to the PCM. When the PCM senses 0 volts at the brake switch input, the PCM de-energizes the Torque Converter Clutch Solenoid Valve.

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

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 seven consecutive 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 4 seconds;

^ then, the vehicle speed is greater than 32 km/h (20 mph) for 4 seconds.

ACTION TAKEN WHEN THE DTC SETS

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

^ DTC P0719 is stored in the PCM history.

^ The PCM inhibits TCC engagement.

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

^ Ask about the customer's driving habits. Ask about unusual traffic conditions, and stop-and-go driving.

^ Inspect the brake switch for proper adjustment.

^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the brake switch 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. Disconnecting the brake switch connector, and observing a status change, isolates the brake switch as the source of the DTC.

3. If circuit 439 shorts to ground, the ERLS fuse opens.

4. If the brake switch is properly adjusted, then the brake switch must be replaced.

5. Replace the PCM only after you have completed the preceding diagnostic steps.