The TCC brake switch reports brake pedal status to the powertrain control module (PCM). The TCC brake switch indicates that the brake pedal is either applied or released. The normally-closed switch supplies battery voltage to the PCM. Applying the brake pedal opens the TCC brake switch, interrupting voltage to the PCM. When the PCM receives 0 volts at the TCC brake switch input, the PCM turns OFF the torque converter clutch pulse width modulation solenoid valve (TCC PWM Solenoid Valve).
If the PCM detects an open brake switch (indicating pedal applied) during acceleration, then DTC P0719 sets. DTC P0719 is a type D DTC.
• | No VSS DTCs P0502 or P0503. |
• | The vehicle speed is less than 8 km/h (5 mph); |
• | Then the vehicle speed is between 8 km/h (5 mph) and 32 km/h (20 mph) for at least 4 seconds; |
• | Finally, the vehicle speed remains above 32 km/h (20 mph) for 6 seconds. |
• | The above conditions must occur 7 times consecutively with the TCC brake switch continuously open for more than 15 minutes. |
• | The PCM does not illuminate the Malfunction Indicator Lamp (MIL). |
• | The PCM disregards the TCC brake switch for TCC scheduling when all of the following conditions are met: |
- | The throttle position angle is greater than 6%. |
- | The vehicle speed is greater than 70 km/h (44 mph). |
- | The throttle position angle was previously greater than 12% while the vehicle speed was greater than 75 km/h (47 mph). |
- | The TCC brake switch has not indicated OFF for more than 2 seconds this ignition cycle. |
• | The PCM stores DTC P0719 in PCM history. |
• | A scan tool clears the DTC from the PCM history. |
• | The PCM clears the DTC from the PCM history if the vehicle completes 40 consecutive warm-up cycles without an emission related diagnostic fault occurring. |
• | The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM. |
• | Inspect the wiring at the PCM, the brake switch connector and all other circuit connecting points 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 |
- | Moisture intrusion |
- | Corrosion |
• | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change. |
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls | |||||||
2 |
Important: Before clearing the DTCs, use the Scan Tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the PCM. Did you record the Failure Records? | -- | ||||||||
3 | Inspect the ENG EMIS fuse for an open. Was a condition found? | -- | -- | |||||||
4 |
Refer to General Electrical Diagnosis in Wiring Systems. Was a condition found and connected? | -- | ||||||||
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 description. Refer to General Electrical Diagnosis in Wiring Systems. Was a condition found and corrected? | -- | -- | |||||||
Does the TCC brake switch status change from Open to Closed? | -- | |||||||||
7 |
Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Is the repair complete? | -- | -- | |||||||
8 |
Refer to General Electrical Diagnosis in Wiring Systems. Was a condition found and corrected? | -- | ||||||||
9 |
Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Is the repair complete? | -- | -- | |||||||
10 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK |