P0724

Diagnostic Chart:

Diagnostic Chart (cont'd):

Wiring Diagram:

CIRCUIT DESCRIPTION

The TCC/Shift Interrupt switch indicates the brake pedal status. This normally-closed switch within the brake switch assembly supplies a B+ signal on circuit 583 to the PCM. The signal voltage circuit opens when you apply the brakes. The PCM uses this signal to de-energize the TCC Solenoid Valve.

When the PCM detects a closed brake switch during a deceleration, then DTC P0724 sets. DTC P0724 is a type D DTC.


CONDITIONS FOR SETTING THE DTC

- No Vehicle Speed Sensor (VSS) DTC P0502

- The PCM detects a closed TCC/Shift Interrupt switch/circuit (12 volts) for 2 seconds and the following sequence of events occurs seven consecutive times:

- The vehicle speed is greater than 32 km/h (20 mph) for 6 seconds;

- Then the vehicle speed is between 8 and 32 km/h (5 and 20 mph) for 4 seconds;

- Then the vehicle speed is less than 8 km/h (5 mph).

ACTION TAKEN WHEN THE DTC SETS

- The PCM freezes shift adapts from being updated.

- 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

- Inspect the wiring for any poor electrical connections at the PCM. Inspect the wiring at the brake switch assembly. 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 an open condition, massage the wiring harness while watching the test equipment for changes.

- Ask the customer about the customer's driving habits. Ask if the customer has any unusual driving conditions (e.g. stop-and-go, expressway, etc.).

- Check for the most current calibration ID. Check for the latest bulletin.

- Inspect the brake switch assembly for proper mounting and for proper adjustment.

TEST DESCRIPTION

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

3. Step 3 tests for voltage at the brake switch assembly.

6. Step 6 tests the TCC/Shift Interrupt switch.