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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 968 (Automatic Transmission - 4L80-E/4L85-E, Diagnosis (P0218 To P2771)) >> Diagnosis >> DTC P0724 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  This step isolates the TCC/Stop lamp switch as a source for setting the DTC.
DTC P0724

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 - 4.8L, 5.3L, and 6.0L
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: Refer to SIR Caution in Cautions and Notices.
  5. Select TCC Brake Switch on the scan tool.
  6. Do not apply the brake pedal.
  7. With the brake pedal not applied, note the TCC brake switch status.
  8. Apply the brake pedal.
Did the TCC Brake Switch status change from CLOSED to OPEN?		 - Go to Intermittent Conditions in Engine Controls - 4.8L, 5.3L, and 6.0L Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the TCC/Stop lamp switch connector from the brake switch.
  3. Turn ON the ignition, with the engine OFF.
Did the TCC Brake Switch status change from CLOSED to OPEN?		 - Go to Step 4  Go to Step 5 
4 Replace the stop lamp switch.
Refer to Stop Lamp Switch Replacement in Lighting Systems.
Did you complete the replacement?		 - Go to Step 7  -
5
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 for a short to voltage.Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
6 Replace the PCM.
Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.
Did you complete the replacement?		 - Go to Step 7  -
7 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Apply the brake pedal several times. Ensure the scan tool Brake Switch displays OPEN when the pedal is applied and CLOSED when the pedal is released.

Does the scan tool TCC Brake Switch status change from CLOSED to OPEN?		 - Go to Step 8  Go to Step 2 
8 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 - 4.8L, 5.3L, and 6.0L System OK
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