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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1327 (Automatic Transmission - Mu4 (Introduction, Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P0724 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. 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:  This step isolates the brake switch as a source for setting the DTC.
DTC P0724

Step Action Value(s) Yes No
Schematic Reference:  Automatic Transmission Controls Schematics  
1 Did you perform the Powertrain Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls - 1.8L (LV6)
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. CAUTION: Refer to SIR Caution in Cautions and Notices.
  6. Disconnect the brake switch connector from the brake switch.
Did the Brake Switch status 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 Hydraulic Brakes.
Did you complete the replacement?		 - Go to Step 6  -
4 Test the signal circuit of the brake switch for a short to power.
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 - 1.8L (LV6).
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?		 0 volts System OK Go to Step 1 
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