DTC P0504 [MZR-CD (RF Turbo)]

id0102f1832500

DTC P0504

Brake switch circuit problem

DETECTION CONDITION

• The PCM monitors changes in input voltage for brake switches No.1 and No.2. If the PCM detects that both brake switches No.1 and No.2 remain on or off for 3 s or there is a 0.5 s or more delay for each of the changes input voltage for brake switches No.1 and No.2, it determines that the brake switch circuit has a malfunction.

POSSIBLE CAUSE

• Brake switch malfunction
• Open circuit between brake switch terminal A and PCM terminal 101
• Open circuit between brake switch terminal B and battery
• Open circuit between brake switch terminal C and body ground
• Open circuit between brake switch terminal D and PCM terminal 100
• Short to power between brake switch terminal A and PCM terminal 101
• Short to ground circuit between brake switch terminal D and PCM terminal 100
• Short to ground circuit between brake switch terminal A and PCM terminal 101
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on the repair, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT BRAKE SWITCH CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the brake switch connector.
• Inspect for poor connection (such as damaged, pull-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 10.
No
Go to the next step.
4
INSPECT BRAKE SWITCH
• Inspect the brake switch.
• Is the brake switch normal?
Yes
Go to the next step.
No
Replace the brake switch, then go to Step 10.
5
INSPECT GROUND CIRCUIT OF BRAKE SWITCH FOR OPEN CIRCUIT
• Inspect for continuity between brake switch terminal C (wiring harness-side) and body ground.
• Measure the voltage between brake switch terminal B (wiring harness-side) and body ground.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to Step 10.
6
INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH FOR SHORT TO GROUND
• Inspect for continuity between the following terminals:
- Brake switch terminal D (wiring harness-side) and body ground.
- Brake switch terminal A (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground circuit, then go to Step 10.
No
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged, pull-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 10.
No
Go to the next step.
8
INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH FOR OPEN CIRCUIT
• Inspect for continuity between the following terminals:
- Brake switch terminal D (wiring harness-side) and PCM terminal 100 (wiring harness-side).
- Brake switch terminal A (wiring harness-side) and PCM terminal 101 (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to Step 10.
9
INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH FOR SHORT TO POWER
• Measure the voltage between brake switch terminal A (wiring harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for short to power circuit, then go to the next step.
No
Go to the next step.
10
VERIFY TROUBLESHOOTING OF P0504 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Turn the engine switch to the ON position (Engine off).
• Depress and release the brake pedal more than 5 times.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.