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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1466 (Automatic Transmission, 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P0748 - 4.2L)) >> Diagnostic Information and Procedures >> DTC P0724 (4.2L) >> Test Description

Test Description

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

  1. 2:  This step isolates the brake switch as a source for setting the DTC.
DTC P0724 (4.2L)

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-4.2L
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 TCC Brake Switch on the scan tool.
    6. CAUTION: Refer to SIR Caution in Cautions and Notices.
  6. Disconnect the brake switch connector from the brake switch.
Did the TCC Brake Switch status on the scan tool change from Closed to Open?		 - Go to Step 3  Go to Step 4 
3 Replace the brake switch.
Refer to Stop Lamp Switch Replacement in Lighting Systems.
Did you complete the replacement?		 - 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 signal circuit of the brake switch for a short to power.Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 6  Go to Step 5 
5 Replace the PCM.
Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.2L.
Did you complete the replacement?		 - Go to Step 6  -
6 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 Open, 0 volts, for 2 seconds.
  6. Select Specific DTC.
  7. Enter DTC P0724.

Has the test run and passed?		 - Go to Step 7  Go to Step 2 
7 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 - 4.2L System OK
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