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 100
•  Open circuit between brake switch terminal B and instrument cluster terminal 2M
•  Open circuit between brake switch terminal C and body ground
•  Open circuit between brake switch terminal D and battery
•  Short to power between brake switch terminal B and instrument cluster terminal 2M
•  Short to ground circuit between brake switch terminal A and PCM terminal 100
•  Short to ground circuit between brake switch terminal B and instrument cluster terminal 2M
•  Communication error between PCM and instrument cluster
•  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.
(See BRAKE PEDAL REMOVAL/INSTALLATION [EXCEPT MZ-CD 1.6 (Y6)].)
(See BRAKE PEDAL REMOVAL/INSTALLATION [EXCEPT MZ-CD 1.6 (Y6)].)
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 D (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 A (wiring harness-side) and body ground.
―  Brake switch terminal B (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 INSTRUMENT CLUSTER CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the instrument cluster 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 A (wiring harness-side) and PCM terminal 100 (wiring harness-side).
―  Brake switch terminal B (wiring harness-side) and instrument cluster terminal 2M (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
•  Turn the engine switch to the ON position (Engine off).
•  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 M-MDS.
•  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.
(See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
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.
(See DTC TABLE [MZR-CD (RF Turbo)].)
No
Troubleshooting completed.