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DTC P2503:00 [PCM (SKYACTIV-X)]

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Note

•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

Description	Generator system: Voltage low input
Detection condition	Determination conditions	•  If any of the following conditions is met: Condition A ―  DC-DC converter (Mazda M Hybrid) input voltage (terminal 2A) is 6 V or less for a continuous specified time. Condition B ―  Voltage of integrated starter generator (ISG) terminal 2A is 6 V or less for a continuous specified time. Condition C ―  DC-DC converter (Mazda M Hybrid) output voltage (terminal 3A) is 6 V or less for a continuous specified time.
	Preconditions	•  Contactor for Mazda M Hybrid battery is on.
	Malfunction determination period	Condition A or B •  5 s period Condition C •  20 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	•  DTCs are stored in the following modules. ―  DC-DC converter (Mazda M Hybrid) ―  Mazda M Hybrid battery ―  Integrated starter generator (ISG) •  Poor connection of the following parts: ―  DC-DC converter (Mazda M Hybrid) ―  Mazda M Hybrid battery ―  Integrated starter generator (ISG) ―  Seat warmer control unit (with seat warmer system and without position memory system) ―  Position memory control module (with position memory system) •  Connector or terminal malfunction of the following parts: ―  DC-DC converter (Mazda M Hybrid) ―  Mazda M Hybrid battery ―  Integrated starter generator (ISG) ―  Seat warmer control unit (with seat warmer system and without position memory system) ―  Position memory control module (with position memory system) •  Short to ground in DC-DC converter (Mazda M Hybrid) charge/discharge circuit •  Open circuit in DC-DC converter (Mazda M Hybrid), Mazda M Hybrid battery, or integrated starter generator (ISG) charge/discharge circuit •  Integrated starter generator (ISG) malfunction •  Short to ground in seat warmer control unit power supply circuit (with seat warmer system and without position memory system) •  Short to ground in position memory control module power supply circuit (with position memory system) •  DC-DC converter (Mazda M Hybrid) malfunction •  Mazda M Hybrid battery malfunction •  Short to ground in DC-DC converter (Mazda M Hybrid), Mazda M Hybrid battery, or integrated starter generator (ISG) charge/discharge circuit •  PCM malfunction

Function Explanation (DTC Detection Outline)

Repeatability Verification Procedure

PID Item/Simulation Item Used In Diagnosis

Function Inspection Using M-MDS

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.

Troubleshooting Diagnostic Procedure

―  Perform an inspection of the DC-DC converter (Mazda M Hybrid) connector.

―  Perform an inspection of the DC-DC converter (Mazda M Hybrid) charge/discharge circuit.

―  Perform an inspection of the integrated starter generator (ISG).

―  Perform an inspection of the Mazda M Hybrid battery connector.

―  Perform an inspection of the integrated starter generator (ISG) connector.

―  Perform an inspection of the DC-DC converter (Mazda M Hybrid), Mazda M Hybrid battery, or integrated starter generator (ISG) charge/discharge circuit.

―  Perform an inspection of the integrated starter generator (ISG) connector.

―  Perform an inspection of the integrated starter generator (ISG).

―  Perform an inspection of the seat warmer control unit (without position memory system)/position memory control module (with position memory system) connector.

―  Perform an inspection of the seat warmer control unit (without position memory system)/position memory control module (with position memory system) power supply circuit.

―  Perform an inspection of the Mazda M Hybrid battery.

―  Perform an inspection of the Mazda M Hybrid battery connector.

―  Perform an inspection of the DC-DC converter (Mazda M Hybrid), Mazda M Hybrid battery, or integrated starter generator (ISG) charge/discharge circuit.

―  Verify that the primary malfunction is resolved and there are no other malfunctions.

Step	Inspection	Results	Action
1	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 23.
2	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 23.
3	PURPOSE: INSPECT DC-DC CONVERTER (Mazda M Hybrid) CHARGE/DISCHARGE CIRCUIT FOR SHORT TO GROUND •  Inspect the charge/discharge 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, then go to Step 23.
4	DETERMINE IF MALFUNCTION CAUSE IS SHORT TO GROUND CIRCUIT OR OTHER PART •  Inspect for continuity between the integrated starter generator (ISG) terminal 2A (wiring harness-side) and body ground without disconnecting the connector. •  Is there continuity?	Yes	Go to Step 10.
		No	Go to the next step.
5	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 23.
6	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 23.
7	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 23.
8	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 23.
9	PURPOSE: INSPECT DC-DC CONVERTER (Mazda M Hybrid), Mazda M Hybrid BATTERY, AND INTEGRATED STARTER GENERATOR (ISG) CHARGE/DISCHARGE CIRCUIT FOR OPEN CIRCUIT •  Inspect the charge/discharge circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location, then go to Step 23.
10	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 23.
11	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 23.
12	PURPOSE: INSPECT INTEGRATED STARTER GENERATOR (ISG) INTERNAL CIRCUIT FOR SHORT TO GROUND •  Inspect for continuity between the integrated starter generator (ISG) terminal 2A (parts-side) and body ground. •  Is there continuity?	Yes	Replace the integrated starter generator (ISG), then go to Step 23. (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
		No	Without seat warmer system: •  Go to Step 16. With seat warmer system: •  Go to the next step.
13	PURPOSE: VERIFY IF POOR CONNECTION OF SEAT WARMER CONTROL UNIT (WITHOUT POSITION MEMORY SYSTEM)/POSITION MEMORY CONTROL MODULE (WITH POSITION MEMORY SYSTEM) AFFECTS DIAGNOSTIC RESULTS •  Inspect the connection condition (part installation condition, connector connection condition) for the seat warmer control unit (without position memory system)/position memory control module (with position memory system). (See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION [(E)].) (See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION [(E)].) •  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 23.
14	PURPOSE: INSPECT SEAT WARMER CONTROL UNIT (WITHOUT POSITION MEMORY SYSTEM)/POSITION MEMORY CONTROL MODULE (WITH POSITION MEMORY SYSTEM) 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 23.
15	PURPOSE: INSPECT SEAT WARMER CONTROL UNIT (WITHOUT POSITION MEMORY SYSTEM)/POSITION MEMORY CONTROL MODULE (WITH POSITION MEMORY SYSTEM) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND •  Inspect the power supply 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, then go to Step 23.
16	PURPOSE: INSPECT DC-DC CONVERTER (Mazda M Hybrid) INTERNAL CIRCUIT FOR SHORT TO GROUND •  Inspect for continuity between the DC-DC converter (Mazda M Hybrid) terminal 2A (parts-side) and body ground. •  Is there continuity?	Yes	Replace the DC-DC converter (Mazda M Hybrid), then go to Step 23. (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
		No	Go to the next step.
17	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 23.
18	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 23.
19	PURPOSE: INSPECT DC-DC CONVERTER (Mazda M Hybrid), Mazda M Hybrid BATTERY, AND INTEGRATED STARTER GENERATOR (ISG) CHARGE/DISCHARGE CIRCUIT FOR SHORT TO GROUND •  Inspect the charge/discharge 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, then go to Step 23.
20	PURPOSE: VERIFY WHETHER MALFUNCTION IS PRESENT OR PAST •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Is DTC P2503:00 a present malfunction?	Yes	Go to the next step.
		No	Go to Step 22.
21	PURPOSE: INSPECT FOR OTHER RELATED DTCs •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Is the DTC P2502:00 displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P2502:00 [PCM (SKYACTIV-X)].)
		No	Perform the repair completion verification.
22	PURPOSE: INSPECT FOR OTHER RELATED DTCs •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].)
		No	Intermittent concern exists. •  Perform the repair completion verification.
23	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.