2001 Chevrolet/Geo Camaro  

DTC P0724 5.7 L


Object Number: 702118 Size: MF
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Master Electrical Component ListAutomatic Transmission Controls SchematicsOBD II Symbol Description Notice
Circuit Description

The brake switch indicates brake pedal status to the powertrain control module (PCM). The brake switch is a normally-closed switch that supplies battery voltage on the input circuit to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. If the PCM receives a zero voltage signal at the brake switch input, and the torque converter clutch (TCC) is engaged, the PCM de-energizes the TCC solenoid valve.

When the PCM detects a closed brake switch circuit (12 volts, high input) during decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.

Conditions for Running the DTC
Conditions for Setting the DTC

The PCM detects a closed brake switch circuit (12 volts) without changing for 2 seconds and the following events occur eight times:

Action Taken When the DTC Sets
Conditions for Clearing the DTC
Diagnostic Aids
Test Description

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

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

DTC P0724 (5.7 L)

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Engine Controls in Engine Controls - 5.7 L

2
  1. Install a Scan Tool .
  2. Turn ON the ignition, with the engine OFF.

    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 .

    Caution

    When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

  6. Disconnect the brake switch connector from the brake switch.

Did the TCC 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 (CKT 420) of the brake switch for a short to power.

Refer to Circuit Testing 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 - 5.7 L.

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?

--

System OK

Go to Step 1