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Home >> Chevrolet >> 2004 >> Malibu Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Automatic Transaxle - 4T40-E/4T45-E Diagnosis (DTC P0218 To P0748 - 2.2L)) >> Diagnostic Information and Procedures >> DTC P0719 (3.4L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Am and 2004 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  Disconnecting the brake switch connector, jumping the circuit, and observing a status change, isolates the brake switch as the source of the DTC.
  2. 3:  If the ignition 3 voltage circuit shorts to ground, the CRUISE fuse opens.
  3. 5:  If the brake switch is properly adjusted, then the brake switch must be replaced.
  4. 8:  Replace the PCM only after you have completed the preceding diagnostic steps.
DTC P0719 (3.4L)

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls -3.4L
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 Failure Records. Using the Clear Info function erases the Failure Records from the PCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Select Brake Switch on the scan tool.
  6. Disconnect the brake switch connector.
  7. Using the J 35616  GM-approved terminal test kit, install a fused jumper wire between the ignition 3 voltage circuit and the TCC brake switch signal circuit of the brake switch connector.
Did the brake switch status change from Open to Closed?		 - Go to Step 5  Go to Step 3 
3 
  1. Remove the CRUISE fuse.
  2. Inspect the fuse for an open.
Refer to Circuit Protection - Fuses in Wiring Systems.Is the fuse open?		 - Go to Step 4  Go to Step 6 
4
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 of the brake switch for a short to ground.Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 9  -
5 
  1. Inspect the brake switch for proper adjustment.
  2. Adjust the brake switch as necessary.
Refer to Stop Lamp Switch Adjustment in Lighting Systems.Did the brake switch require adjustment?		 - Go to Step 9  Go to Step 7 
6
  1. Test the ignition 3 voltage circuit of the brake switch for an open.
  2. Test the signal circuit of the brake switch for an open.
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.Did you find and correct a condition?		 - Go to Step 9  Go to Step 8 
7 Replace the brake switch.
Refer to Stop Lamp Switch Replacement in Lighting Systems.
Did you complete the replacement?		 - Go to Step 9  -
8  Replace the PCM.
Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 3.4L.
Did you complete the replacement?		 - Go to Step 9  -
9 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:
    • Turn ON the ignition, with the engine OFF.
    • Apply and release the brake pedal.
    • The PCM must receive 12 volts, brake switch closed, on the circuit for 2 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0719.

Has the test run and passed?		 - Go to Step 10  Go to Step 2 
10 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 in Engine Controls - 3.4L System OK
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