DTC P0504:00 [PCM (SKYACTIV-X)]

System malfunction location	Brake switch circuit problem
Detection condition	• The condition in which the brake switch No.1 and No.2 signals are both on or off continues for 3 s or more and the condition is repeated 5 times.
Fail-safe	• Not applicable
Possible cause	Caution • Inspect the brake switch with it installed to the brake pedal, otherwise the brake switch may not operate normally. If the brake switch is removed from the brake pedal, replace the brake switch with a new one. • Brake switch connector or terminals malfunction • Short to ground or open circuit in brake switch No.1 power supply circuit • Open circuit in brake switch No.2 ground circuit • Body control module (BCM) connector or terminals malfunction • Short to ground in brake switch signal circuit • PCM connector or terminals malfunction • Short to power supply in brake switch signal circuit • Open circuit in brake switch signal circuit • Short or open circuit in body control module (BCM) CAN communication line • Brake switch malfunction • Body control module (BCM) malfunction • PCM malfunction

System malfunction location

Brake switch circuit problem

Detection condition

• The condition in which the brake switch No.1 and No.2 signals are both on or off continues for 3 s or more and the condition is repeated 5 times.

Fail-safe

• Not applicable

Possible cause

Caution

• Inspect the brake switch with it installed to the brake pedal, otherwise the brake switch may not operate normally. If the brake switch is removed from the brake pedal, replace the brake switch with a new one.

• Brake switch connector or terminals malfunction

• Short to ground or open circuit in brake switch No.1 power supply circuit

• Open circuit in brake switch No.2 ground circuit

• Body control module (BCM) connector or terminals malfunction

• Short to ground in brake switch signal circuit

• PCM connector or terminals malfunction

• Short to power supply in brake switch signal circuit

• Open circuit in brake switch signal circuit

• Short or open circuit in body control module (BCM) CAN communication line

• Brake switch malfunction

• Body control module (BCM) malfunction

• PCM malfunction

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any of the following DTCs displayed? ― P0571:00	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P0571:00 [PCM (SKYACTIV-X)].)
No	Go to the next step.
4	VERIFY DTCs • Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ― PCM ― Mazda M Hybrid battery ― DC-DC converter (Mazda M Hybrid) ― Integrated starter generator (ISG) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].) (See DTC TABLE [Mazda M Hybrid BATTERY].) (See DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)].) (See DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)].)
No	Go to the next step.
5	INSPECT BRAKE SWITCH CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT BRAKE SWITCH No.1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT BRAKE SWITCH No.2 GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT BODY CONTROL MODULE (BCM) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
13	INSPECT BODY CONTROL MODULE (BCM) CAN COMMUNICATION LINE FOR SHORT OR OPEN CIRCUIT • Inspect the applicable circuit for short and open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
14	INSPECT BRAKE SWITCH FOR MALFUNCTION • Inspect the applicable part. (See BRAKE SWITCH INSPECTION.) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D. (E)].) (See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
15	INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Inspect the applicable part. (See BODY CONTROL MODULE (BCM) INSPECTION [(E)].) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Switch the ignition ON (engine off). ― After depressing the brake pedal for 3 s or more, perform the operation of depressing and releasing the brake pedal 5 times. • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

• Record the freeze frame data/snapshot data.

Note

• Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY

• Verify related Service Bulletins, on-line repair information, or Service Information availability.

• Is any related Information available?

Yes

Perform repair or diagnosis according to the available information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Are any of the following DTCs displayed?

― P0571:00

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC P0571:00 [PCM (SKYACTIV-X)].)

Go to the next step.

VERIFY DTCs

• Perform the DTC inspection for the following modules.

(See DTC INSPECTION.)

― PCM

― Mazda M Hybrid battery

― DC-DC converter (Mazda M Hybrid)

― Integrated starter generator (ISG)

• Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-X)].)

(See DTC TABLE [Mazda M Hybrid BATTERY].)

(See DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)].)

(See DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)].)

Go to the next step.

INSPECT BRAKE SWITCH CONNECTOR FOR MALFUNCTION

• Inspect the applicable connector and terminal.

(See CONNECTOR INSPECTION.)

• Are the connector and terminal normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BRAKE SWITCH No.1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

• Inspect the power supply circuit for an open circuit and short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BRAKE SWITCH No.2 GROUND CIRCUIT FOR OPEN CIRCUIT

• Inspect the applicable circuit for open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BODY CONTROL MODULE (BCM) CONNECTOR FOR MALFUNCTION

• Inspect the applicable connector and terminal.

(See CONNECTOR INSPECTION.)

• Are the connector and terminal normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND

• Inspect the applicable circuit for a short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT PCM CONNECTOR FOR MALFUNCTION

• Inspect the applicable connector and terminal.

(See CONNECTOR INSPECTION.)

• Are the connector and terminal normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

• Inspect the applicable circuit for a short to power supply.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT

• Inspect the applicable circuit for open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BODY CONTROL MODULE (BCM) CAN COMMUNICATION LINE FOR SHORT OR OPEN CIRCUIT

• Inspect the applicable circuit for short and open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT BRAKE SWITCH FOR MALFUNCTION

• Inspect the applicable part.

(See BRAKE SWITCH INSPECTION.)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D. (E)].)

(See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)

INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION

• Inspect the applicable part.

(See BODY CONTROL MODULE (BCM) INSPECTION [(E)].)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

• Install/connect the part removed/disconnected during the troubleshooting procedure.

• Clear the DTC recorded in the memory.

(See CLEARING DTC.)

• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

― Switch the ignition ON (engine off).

― After depressing the brake pedal for 3 s or more, perform the operation of depressing and releasing the brake pedal 5 times.

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

• If the malfunction recurs, replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

• Perform the DTC inspection.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

DTC troubleshooting completed.

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