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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Automatic Transmission - 4L80-E/4L85-E - DTC P0218 To DTC P0976) >> DTC P0719 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  This step isolates the brake switch as a source for setting the DTC.
DTC P0719

Step Action Yes No
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the ECM and TCM Failure Records. Using the Clear Info function erases the Failure Records from the ECM and TCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Select TCC Brake Switch on the scan tool.
    6. CAUTION: Refer to SIR Caution .
  6. Disconnect the brake switch connector from the brake switch.
  7. Connect a test lamp from the battery positive voltage supply circuit of the brake switch connector to ground.
Does the test lamp illuminate?		 Go to Step 3  Go to Step 4 
3  Connect a fused jumper wire between the battery positive voltage supply and stop lamp supply voltage signal circuits of the stop lamp switch connector.
Did the TCC Brake Switch status on the scan tool change from Open to Closed?		 Go to Step 9  Go to Step 7 
4 Inspect the MISC IGN fuse for an open. Refer to Circuit Protection - Fuses .
Is the fuse open?		 Go to Step 5  Go to Step 10 
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 distribution.
Test the battery positive voltage circuit of the brake switch for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs .Did you find and correct the condition?		 Go to Step 13  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 for complete circuit distribution.
Test the stop lamp supply voltage signal circuit of the brake switch for a short to ground between the stop lamp switch and the fuse block-body. Refer to Testing for Short to Ground and Wiring Repairs .Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
7 Inspect the STOP/CHMSL fuse for an open. Refer to Circuit Protection - Fuses .
Is the fuse open?		 Go to Step 8  Go to Step 11 
8
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the stop lamp supply voltage signal circuit for a short to ground between the fuse block-body and TCM.Did you find and correct the condition?		 Go to Step 13  -
9 Replace the brake switch. Refer to Stop Lamp Switch Replacement (Adjustable Pedal) or Stop Lamp Switch Replacement (Non-Adjustable Pedal) .
Did you complete the replacement?		 Go to Step 13  -
10
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the battery positive voltage circuit of the brake switch for an open. Refer to Testing for Continuity and Wiring Repairs .Did you find and correct the condition?		 Go to Step 13  -
11
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the stop lamp supply voltage signal circuit of the brake switch for an open between the stop lamp switch and the fuse block-body or between the fuse block-body and TCM. Refer to Testing for Continuity andWiring Repairs .Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
12 Replace the TCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 13  -
13 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Turn ON the ignition, with the engine OFF.
  4. Apply and release the brake pedal.
  5. Verify that the scan tool TCC Brake Switch status indicates Closed, 12 volts, for 5 seconds or greater.
  6. Select Specific DTC.
  7. Enter DTC P0719.

Has the test run and passed?		 Go to Step 14  Go to Step 2 
14 With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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