Workshop Manual

7A1–52
TRANSMISSION CONTROL SYSTEM (4L30–E)
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This step isolates the brake switch as a source for
setting the DTC.
DTC P0724 Brake Switch Circuit High (Stuck Off)
Step Action Yes No
1 Was the Powertrain On–Board Diagnostic (OBD) System Check
performed?
Go to Step 2
Go to Powertrain
OBD System
Check
2 1. Install the scan tool.
2. With the engine “off,” turn the ignition switch to the “on”
position.
NOTE: Before clearing the DTC(s), use the scan tool in order to
record the “Failure Records” for reference. Using the “Clear Info”
function will erase the stored “Failure Records” from the PCM.
3. Record the DTC Failure Records, then clear the DTC(s).
4. Select “Brake Switch” on the scan tool.
5. 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.
Is the replacement complete?
Go to Step 6 —
4 Inspect circuit BRN/RED for a short to B+ condition. Repair the
circuit if necessary.
Did you find a short to B+ condition?
Go to Step 6 Go to Step 5
5 Replace the PCM.
Is the replacement complete?
Go to Step 6 —
6 In order to verify your repair, perform the following procedure:
1. Select DTC.
2. Select “Clear Info”.
3. With the engine “off” turn the ignition switch to the “on” position.
4. Apply the brake pedal.
5. Verify that the brake switch status indicates “Open” (0 volts) for
2 seconds.
6. Select Specific DTC. Enter DTC P0724.
Has the test run and passed?
System OK
Begin the
diagnosis again.
Go to Step 1