DTC P2504:00 [PCM (SKYACTIV-X)]

Description	Generator system: Voltage high input
Detection condition	Determination conditions	• If any of the following conditions is met: Condition A ― Battery voltage is 15.9 V or more for a continuous specified time. Condition B ― DC-DC converter (Mazda M Hybrid) input voltage (terminal 2A) is 35 V or more for a continuous specified time. Condition C ― Voltage of integrated starter generator (ISG) terminal 2A is 35 V or more for a continuous specified time. Condition D ― DC-DC converter (Mazda M Hybrid) output voltage (terminal 3A) is 16 V or more for a continuous specified time.
Preconditions	• Contactor for Mazda M Hybrid battery is on.
Malfunction determination period	• 5 s period
Drive cycle	• 1
Self test type	• CMDTC self test
Sensor used	• PCM • DC-DC converter (Mazda M Hybrid) • Mazda M Hybrid battery • Integrated starter generator (ISG)
Fail-safe function	• Stops power supply by step-down circuit in DC-DC converter (Mazda M Hybrid). • Stops power generation by integrated starter generator (ISG). • Turns off contactor for Mazda M Hybrid battery and supply power to vehicle electrical devices (12 V power supply) from battery.
Vehicle status when DTCs are output	• If the vehicle continues to be driven while the DTC is detected the battery will be depleted. ― A malfunction occurs with an electrical device and the vehicle stops. • The following vehicle conditions differ depending on the type of malfunction: ― Vehicle shock may occur due to generator load. ― Idling feel due to generator-stop may occur.
Possible cause	• Poor connection of the following parts: ― DC-DC converter (Mazda M Hybrid) ― Mazda M Hybrid battery ― Integrated starter generator (ISG) • Connector or terminal malfunction of the following parts: ― DC-DC converter (Mazda M Hybrid) ― Mazda M Hybrid battery ― Integrated starter generator (ISG) • Charge/discharge circuits are short to each other • PCM malfunction

Description

Generator system: Voltage high input

Detection condition

Determination conditions

• If any of the following conditions is met:

Condition A

― Battery voltage is 15.9 V or more for a continuous specified time.

Condition B

― DC-DC converter (Mazda M Hybrid) input voltage (terminal 2A) is 35 V or more for a continuous specified time.

Condition C

― Voltage of integrated starter generator (ISG) terminal 2A is 35 V or more for a continuous specified time.

Condition D

― DC-DC converter (Mazda M Hybrid) output voltage (terminal 3A) is 16 V or more for a continuous specified time.

Preconditions

• Contactor for Mazda M Hybrid battery is on.

Malfunction determination period

• 5 s period

Drive cycle

• 1

Self test type

• CMDTC self test

Sensor used

• PCM

• DC-DC converter (Mazda M Hybrid)

• Mazda M Hybrid battery

• Integrated starter generator (ISG)

Fail-safe function

• Stops power supply by step-down circuit in DC-DC converter (Mazda M Hybrid).

• Stops power generation by integrated starter generator (ISG).

• Turns off contactor for Mazda M Hybrid battery and supply power to vehicle electrical devices (12 V power supply) from battery.

Vehicle status when DTCs are output

• If the vehicle continues to be driven while the DTC is detected the battery will be depleted.

― A malfunction occurs with an electrical device and the vehicle stops.

• The following vehicle conditions differ depending on the type of malfunction:

― Vehicle shock may occur due to generator load.

― Idling feel due to generator-stop may occur.

Possible cause

• Poor connection of the following parts:

― DC-DC converter (Mazda M Hybrid)

― Mazda M Hybrid battery

― Integrated starter generator (ISG)

• Connector or terminal malfunction of the following parts:

― DC-DC converter (Mazda M Hybrid)

― Mazda M Hybrid battery

― Integrated starter generator (ISG)

• Charge/discharge circuits are short to each other

• PCM malfunction

Step	Inspection	Results	Action
1	PURPOSE: 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.
2	PURPOSE: 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.
3	PURPOSE: INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ― Integrated starter generator (ISG) ― Mazda M Hybrid battery ― DC-DC converter (Mazda M Hybrid) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)].) (See DTC TABLE [Mazda M Hybrid BATTERY].) (See DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)].)
No	Go to the next step.
4	PURPOSE: INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any other of the following DTCs displayed? ― P0AB9:00 ― P2502:00 ― P2503:00	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].)
No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

Step

Inspection

Results

Action

PURPOSE: 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.

PURPOSE: 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.

PURPOSE: INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the following modules.

(See DTC INSPECTION.)

― Integrated starter generator (ISG)

― Mazda M Hybrid battery

― DC-DC converter (Mazda M Hybrid)

• Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

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

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

Go to the next step.

PURPOSE: INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Are any other of the following DTCs displayed?

― P0AB9:00

― P2502:00

― P2503:00

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

Step	Inspection	Results	Action
1	DETERMINE IF MALFUNCTION CAUSE IS SHORT TO EACH OTHER IN CHARGE/DISCHARGE CIRCUITS OR OTHER PART • Measure the voltage between the DC-DC converter (Mazda M Hybrid) terminal 3A (wiring harness-side) and battery positive terminal. • Is the voltage 15.9 V or more?	Yes	Go to the next step.
No	Intermittent concern exists. • Perform the repair completion verification.
2	PURPOSE: VERIFY IF POOR CONNECTION OF DC-DC CONVERTER (Mazda M Hybrid) AFFECTS DIAGNOSTIC RESULTS • Inspect the connection condition (part installation condition, connector connection condition) for the DC-DC converter (Mazda M Hybrid). (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.) • Is the connection condition (part installation condition, connector connection condition) for each part normal?	Yes	Go to the next step.
No	Connect each part or the connector correctly, then go to Step 9.
3	PURPOSE: INSPECT DC-DC CONVERTER (Mazda M Hybrid) 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, then go to Step 9.
4	PURPOSE: VERIFY IF POOR CONNECTION OF Mazda M Hybrid BATTERY AFFECTS DIAGNOSTIC RESULTS • Inspect the connection condition (part installation condition, connector connection condition) for the Mazda M Hybrid battery. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.) • Is the connection condition (part installation condition, connector connection condition) for each part normal?	Yes	Go to the next step.
No	Connect each part or the connector correctly, then go to Step 9.
5	PURPOSE: INSPECT Mazda M Hybrid BATTERY 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, then go to Step 9.
6	PURPOSE: VERIFY IF POOR CONNECTION OF INTEGRATED STARTER GENERATOR (ISG) AFFECTS DIAGNOSTIC RESULTS • Inspect the connection condition (part installation condition, connector connection condition) for the integrated starter generator (ISG). (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) • Is the connection condition (part installation condition, connector connection condition) for each part normal?	Yes	Go to the next step.
No	Connect each part or the connector correctly, then go to Step 9.
7	PURPOSE: INSPECT INTEGRATED STARTER GENERATOR (ISG) 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, then go to Step 9.
8	PURPOSE: INSPECT CHARGE/DISCHARGE CIRCUITS FOR SHORT TO EACH OTHER • Inspect the charge/discharge circuits for a short to each other. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, then go to the next step.
9	PURPOSE: VERIFY Mazda M Hybrid BATTERY DTCs • Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [Mazda M Hybrid BATTERY].)
No	Perform the repair completion verification.
Repair completion verification 1	PURPOSE: 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. ― Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • 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	PURPOSE: 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

DETERMINE IF MALFUNCTION CAUSE IS SHORT TO EACH OTHER IN CHARGE/DISCHARGE CIRCUITS OR OTHER PART

• Measure the voltage between the DC-DC converter (Mazda M Hybrid) terminal 3A (wiring harness-side) and battery positive terminal.

• Is the voltage 15.9 V or more?

Yes

Go to the next step.

Intermittent concern exists.

• Perform the repair completion verification.

PURPOSE: VERIFY IF POOR CONNECTION OF DC-DC CONVERTER (Mazda M Hybrid) AFFECTS DIAGNOSTIC RESULTS

• Inspect the connection condition (part installation condition, connector connection condition) for the DC-DC converter (Mazda M Hybrid).

(See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)

• Is the connection condition (part installation condition, connector connection condition) for each part normal?

Yes

Go to the next step.

Connect each part or the connector correctly, then go to Step 9.

PURPOSE: INSPECT DC-DC CONVERTER (Mazda M Hybrid) 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, then go to Step 9.

PURPOSE: VERIFY IF POOR CONNECTION OF Mazda M Hybrid BATTERY AFFECTS DIAGNOSTIC RESULTS

• Inspect the connection condition (part installation condition, connector connection condition) for the Mazda M Hybrid battery.

(See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)

• Is the connection condition (part installation condition, connector connection condition) for each part normal?

Yes

Go to the next step.

Connect each part or the connector correctly, then go to Step 9.

PURPOSE: INSPECT Mazda M Hybrid BATTERY 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, then go to Step 9.

PURPOSE: VERIFY IF POOR CONNECTION OF INTEGRATED STARTER GENERATOR (ISG) AFFECTS DIAGNOSTIC RESULTS

• Inspect the connection condition (part installation condition, connector connection condition) for the integrated starter generator (ISG).

(See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

• Is the connection condition (part installation condition, connector connection condition) for each part normal?

Yes

Go to the next step.

Connect each part or the connector correctly, then go to Step 9.

PURPOSE: INSPECT INTEGRATED STARTER GENERATOR (ISG) 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, then go to Step 9.

PURPOSE: INSPECT CHARGE/DISCHARGE CIRCUITS FOR SHORT TO EACH OTHER

• Inspect the charge/discharge circuits for a short to each other.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, then go to the next step.

PURPOSE: VERIFY Mazda M Hybrid BATTERY DTCs

• Perform the DTC inspection for the Mazda M Hybrid battery.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

Perform the repair completion verification.

Repair completion verification 1

PURPOSE: 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.

― Implement the repeatability verification procedure.

(See Repeatability Verification Procedure.)

• 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

PURPOSE: 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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