GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Yukon XL - 2WD 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 DTC P0719

Object Number: 651684 Size: MF
Master Electrical Component List
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice

Circuit Description

The TCC/Stop lamp switch indicates the brake pedal status. The normally-closed TCC/Stop lamp switch supplies a B+ signal to the powertrain control module (PCM). The signal voltage circuit opens when the brakes are applied.

If the PCM detects an open TCC/Stop lamp switch circuit during accelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.

Conditions for Running the DTC
    • No AT VSS DTC P0502 or DTC P0503.
    • The following sequence of events occurs:
        1. The vehicle speed is less than 8 km/h (5 mph).
        2. Then the vehicle speed is 8-40 km/h (5-25 mph) for 1.7 seconds.
        3. Then the vehicle speed is greater than 40 km/h (25 mph) for 7 seconds.

Conditions for Setting the DTC
    • All conditions are met for 8 occurrences.
    • The PCM detects an open TCC/Stop lamp switch/circuit, 0 volts, for 15 minutes.

Action Taken When the DTC Sets
    • The PCM does not illuminate the malfunction indicator lamp (MIL).
    • For TCC scheduling, the PCM disregards the brake switch state if the throttle angle sensor is greater than 1.5 percent and the vehicle speed is greater than 32 km/h (20 mph).
    • 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 clears the DTC from PCM history.
    • 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 the stop lamp switch for proper mounting and operation.

Test Description

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

  1. This step tests for TCC/Stop lamp switch voltage to the PCM connector.

    2.

  2. This step isolates the TCC/Stop lamp switch as a source for setting the DTC.

    3.

  3. This step tests for a short to ground in the ignition 3 voltage circuit (CKT 441), ignition voltage, to the TCC/Stop lamp switch.

    4.

  4. This step tests for a short to ground in the TCC brake switch (CKT 420), from the TCC/Stop lamp switch to the PCM.

    5.

  5. This step isolates the PCM as a source for causing the fuse to open.

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Engine Controls in Engine Controls - 6.0L or Diagnostic System Check - Engine Controls in Engine Controls - 8.1L

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

    3. Important: Before clearing the DTCs, use the scan tool in order to record the Failure Records. Using the Clear Info Function erases the Failure Records from the PCM.

  3. Record the Failure Records.
  4. Clear the DTCs.

    5. Caution: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

  5. Select the TCC Brake Switch on the scan tool.
  6. Do not apply the brake pedal.

Does the scan tool TCC Brake Switch indicate CLOSED, when the brake pedal is not applied?

--

Go to Intermittent Conditions in Engine Controls - 6.0L or Intermittent Conditions in Engine Controls - 8.1L

Go to Step 3

3
  1. Remove the brake fuse.
  2. Inspect the brake fuse for an open.

    3. Refer to General Electrical Diagnosis in Wiring Systems.

Is the fuse open?

--

Go to Step 10

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the PCM connector C1 from the PCM.
  3. Connect a 12 volt test lamp to a good ground.
  4. Using the J 35616-A connector test adapter kit and the 12 volt test lamp, probe terminal C1-33.
  5. Re-install the fuse.
  6. Turn ON the ignition, with the engine OFF.
  7. Do not apply the brake pedal.

Does the test lamp illuminate?

--

Go to Step 15

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Remove the connector from the TCC/Stop lamp switch.
  3. Use the DMM to measure B+ voltage at terminal D of the brake switch connector.
  4. Turn ON the ignition, with the engine OFF.

Does the voltage measure within the specified value?

10-13 V

Go to Step 7

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 in Wiring Systems for complete circuit distribution.

Test the ignition 3 voltage circuit (CKT 441) for an open.

Did you find and correct the condition?

--

Go to Step 16

--

7

  1. Turn ON the ignition, with the engine OFF.
  2. Install a fused jumper wire from terminal C to terminal D of the TCC/Stop lamp switch connector.
  3. Probe the PCM connector terminal C1-33 with the test lamp.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 8

8

Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution.

Test the TCC brake switch signal circuit (CKT 420) for an open.

Did you find and correct the condition?

--

Go to Step 16

--

9

Replace the TCC/Stop lamp switch.

Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the replacement?

--

Go to Step 16

--

10

  1. Turn ON the ignition, with the engine OFF.
  2. Apply and hold the brake pedal.
  3. Install a new fuse while keeping the brake pedal applied.

Does the fuse open with the brake pedal applied?

--

Go to Step 11

Go to Step 12

11

Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution.

Test the ignition 3 voltage circuit (CKT 441) for a short to ground.

Did you find and correct the condition?

--

Go to Step 16

--

12

With the key in the RUN position, release the brake pedal.

Does the fuse open when the brake pedal is released?

--

Go to Step 13

Go to Intermittent Conditions in Engine Controls - 6.0L or Intermittent Conditions in Engine Controls - 8.1L

13

  1. Disconnect the PCM connector C1 from the PCM. Additional DTCs may set.
  2. Turn ON the ignition, with the engine OFF.
  3. Install a new fuse.
  4. Do not apply the brake pedal.

Does the fuse open?

--

Go to Step 14

Go to Step 15

14

Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution.

Test the TCC brake switch (CKT 420) for a short to ground.

Did you find and correct the condition?

--

Go to Step 16

--

15

Replace the PCM.

Refer to Powertrain Control Module Replacement in Engine Controls - 6.0L or Powertrain Control Module Replacement in Engine Controls - 8.1L.

Did you complete the replacement?

--

Go to Step 16

--

16

Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    4. • Turn ON the ignition, with the engine OFF.
    • The brake pedal is not applied.
    • Select TCC Brake Switch on the scan tool.

Does the TCC Brake Switch indicate CLOSED when the brake pedal is not applied, then indicate OPEN when the brake pedal is applied?

--

System OK

Go to Step 1