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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY STORED CAN COMMUNICATION DTC IN PCM AND INSTRUMENT CLUSTER
• Retrieve the PCM and instrument cluster DTC using the M-MDS.
• Is the CAN communication DTC present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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4
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INSPECT BRAKE SWITCH AND BRAKE PEDAL POSITION (BPP) SWITCH POOR INSTALLATION
• Inspect the brake switch and BPP switch for installation.
• Are there installed properly?
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Yes
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Go to the next step.
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No
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Install the brake switch properly, then go to Step 12.
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5
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INSPECT BRAKE SWITCH AND BRAKE PEDAL POSITION (BPP) SWITCH CONNECTORS CONDITION
• Switch the ignition to off.
• Disconnect the brake switch and BPP switch connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the connector and/or terminals, then go to Step 12.
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No
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Go to the next step.
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6
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VERIFY STOP LIGHT OPERATION
• Verify the stop light operation.
• Is the stop light turn on and off according to brake pedal conditions?
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Yes
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Go to Step 9.
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No
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Stop light is always on
• Repair or replace for a possible short to power supply between brake switch terminal B and PCM terminal 317, then go to Step 12.
Stop light is always off, go to the next step.
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7
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VERIFY STOP FUSE CONDITION
• Verify the STOP fuse condition.
• Is the STOP fuse normal?
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Yes
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Go to the next step.
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No
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If the fuse is blown:
• Repair for short to ground in following wiring harness:
-
― Between STOP fuse and brake switch
― Between brake switch terminal B and PCM terminal 317
• If the fuse is deterioration:
-
― Replace the fuse.
Then go to Step 12.
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8
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VERIFY WHETHER MALFUNCTION IS BRAKE SWITCH OR OPEN CIRCUIT
• Inspect the brake switch.
• Is there any malfunction?
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Yes
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Replace the brake switch, then go to Step 12.
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No
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Repair for a possible open circuit between brake switch terminal A and STOP fuse, then go to Step 12.
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9
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INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN
• Measure the voltage between PCM terminal 317 (wiring harness-side) and body ground.
• Is the voltage normal?
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Yes
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Go to the next step.
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No
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Repair for a possible open circuit between brake switch terminal B and PCM terminal 317, then go to Step 12.
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10
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INSPECT BRAKE PEDAL POSITION (BPP) SWITCH
• Inspect the BPP switch.
• Is there any malfunction?
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Yes
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Replace the BPP switch, then go to Step 12.
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No
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Go to the next step.
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11
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VERIFY WHETHER MALFUNCTION IS INSTRUMENT CLUSTER OR BPP SWITCH HARNESSES
• Measure the voltage between instrument cluster terminal 2N (wiring harness-side) and body ground.
• Is the voltage normal?
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Yes
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Replace the instrument cluster, then go to the next step.
(Instrument cluster can not transmit BPP signal to PCM)
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No
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Repair for a possible open or short circuit between following, then go to the next step.
• BPP switch terminal A and instrument cluster terminal 2N
• BPP switch terminal B and body ground
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12
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VERIFY THAT DTC P0504 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the PCM.
Go to the next step.
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No
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Go to the next step.
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13
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VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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