DTC P2502:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P2502:00 [SKYACTIV-G 2.5]

NOTE:

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

Details On DTCs (Without i-ELOOP)


DESCRIPTION	Generator system: Malfunction in voltage generated by generator
DETECTION CONDITION	Determination conditions	The voltage generated by the generator is 17 V or higher and the battery voltage is 11 V or less for a continuous specified time.
	Preconditions	While engine is running
	Malfunction determination period	5 s period
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	PCM
FAIL-SAFE FUNCTION	Generator control is inhibited.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	A warning message is displayed on the LCD. (Type A instrument cluster) Illuminates charging system warning light. (Type B instrument cluster) 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.
POSSIBLE CAUSE	Poor connection of the following parts: Battery Generator PCM Connector or terminal malfunction of the following parts: Battery Generator PCM Short to ground or open circuit in generator charge/discharge circuit Short to ground in wiring harness between battery positive terminal and generator terminal 1A STARTER 250 A fuse malfunction Open circuit in wiring harness between battery positive terminal and generator terminal 1A Generator malfunction Battery malfunction PCM malfunction

System Wiring Diagram (Without i-ELOOP)

Function Explanation (DTC Detection Outline) (Without i-ELOOP)

When the charge/discharge circuit for the power supplying the vehicle is normal, the vehicle will operate normally. In this diagnostic, a low vehicle supply voltage is detected even though the generator is generating power, a malfunction in the charge/discharge circuit is detected, and verification of vehicle malfunctions/safety assurance is performed.

Repeatability Verification Procedure (Without i-ELOOP)

Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].)

Start the engine.

Leave for 180 s while idling with no electrical load.

Leave for 30 s while idling with high electrical load.

PID Item/Simulation Item Used In Diagnosis (Without i-ELOOP)

Not applicable

Troubleshooting Diagnostic Procedure (Without i-ELOOP)

Intention of troubleshooting procedure

Step 1—6

Perform an inspection of each signal transmission system.

Step 7

Perform a unit inspection of the generator.

Step 8—10

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


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: VERIFY IF POOR CONNECTION OF EACH PART AFFECTS DIAGNOSTIC RESULTS Switch the ignition off. Inspect the connection condition (part installation condition, connector connection condition) for the following parts: Battery Generator PCM Is the connection condition (part installation condition, connector connection condition) for each part normal?	Yes	Go to the next step.
2		No	Connect each part or the connector correctly, then go to Step 8.
3	PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS Disconnect the connector of the following parts. Battery Generator PCM Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 8.
3		No	Go to the next step.
4	PURPOSE: INSPECT FUSE Remove the STARTER 250 A fuse. Inspect the STARTER 250 A fuse. Is there any malfunction?	Yes	If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and generator terminal 1A. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Replace the malfunctioning fuse. If the fuse is damaged: Replace the fuse. Go to Step 8.
4		No	Reinstall the STARTER 250 A fuse, then go to the next step.
5	PURPOSE: VERIFY IF SHORT TO GROUND IN GENERATOR CHARGE/DISCHARGE CIRCUIT AFFECTS DIAGNOSTIC RESULTS Verify that the battery, generator and PCM connectors are disconnected. Inspect for continuity between generator terminal 1A (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and generator terminal 1A. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to Step 8.
5		No	Go to the next step.
6	PURPOSE: VERIFY IF OPEN CIRCUIT IN GENERATOR CHARGE/DISCHARGE CIRCUIT AFFECTS DIAGNOSTIC RESULTS Verify that the battery, generator and PCM connectors are disconnected. Inspect for continuity between battery positive terminal (wiring harness-side) and generator terminal 1A (wiring harness-side). Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and generator terminal 1A. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 8.
7	PURPOSE: DETERMINE INTEGRITY OF GENERATOR Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].) Is there any malfunction?	Yes	Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].)
7		No	Go to the next step.
8	PURPOSE: VERIFY CONDITIONS OF BATTERY Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.5].)	—	Follow the inspection instructions, then go to the next step.
9	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Always reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].) Implement the repeatability verification procedure. (See Repeatability Verification Procedure (Without i-ELOOP).) Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
9		No	Go to the next step.
10	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
10		No	DTC troubleshooting completed.

Details On DTCs (With i-ELOOP)


DESCRIPTION	Generator system: Malfunction in voltage generated by generator
DETECTION CONDITION	Determination conditions	Any one of the following conditions is met: Battery voltage is 11 V or less and condition in which current sensor detects battery charging for specified period continues Pre-charge mode (capacitor (i-ELOOP) recharge) is implemented and pre-charge mode is not completed even though specified period has elapsed.
	Preconditions	All of the following conditions are met: While engine is running CAN communication condition related to current sensor is normal Pre-charge mode (capacitor (i-ELOOP) recharge) is not operating No transition to bypass mode (generator and battery directly connected)
	Malfunction determination period	Pre-charge mode (capacitor (i-ELOOP) recharge) condition: 3 min Other condition: 5 s
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	Current sensor Front body control module (FBCM) PCM Generator DC-DC converter
FAIL-SAFE FUNCTION	Generator switch to default mode requested (14.5 V constant voltage power generation).
VEHICLE STATUS WHEN DTCs ARE OUTPUT	A warning message is displayed on the LCD. 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. Pre-charge warning is displayed.
POSSIBLE CAUSE	Poor connection of the following parts: Battery Generator PCM Capacitor (i-ELOOP) DC-DC converter Connector or terminal malfunction of the following parts: Battery Generator PCM Capacitor (i-ELOOP) DC-DC converter STARTER 250 A fuse malfunction Short to ground in wiring harness between the following terminals: DC-DC converter terminal 4A—Battery positive terminal DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A DC-DC converter terminal 1I—PCM terminal 2L Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Open circuit in wiring harness between the following terminals: DC-DC converter terminal 4A—Battery positive terminal DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A DC-DC converter terminal 1I—PCM terminal 2L Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Battery malfunction Capacitor (i-ELOOP) malfunction Generator malfunction Current sensor malfunction Front body control module (FBCM) malfunction DC-DC converter malfunction PCM malfunction

System Wiring Diagram (With i-ELOOP)

Function Explanation (DTC Detection Outline) (With i-ELOOP)

When the charge/discharge circuit for the power supplying the vehicle is normal, the vehicle will operate normally. In this diagnostic, a low vehicle supply voltage is detected even though the generator is generating power, a malfunction in the charge/discharge circuit is detected, and verification of vehicle malfunctions/safety assurance is performed.

Repeatability Verification Procedure (With i-ELOOP)

Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].)

Start the engine.

Leave for 180 s while idling with no electrical load.

Leave for 30 s while idling with high electrical load.

PID Item/Simulation Item Used In Diagnosis (With i-ELOOP)

Not applicable.

Function Inspection Using M-MDS (With i-ELOOP)


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: VERIFY IF PRE-CHARGE WARNING IS DISPLAYED OR NOT Start the engine. Is the pre-charge warning displayed in the LCD?	Yes	Go to the next step.
2		No	Go to the troubleshooting procedure to perform the procedure from Step 1.
3	PURPOSE: VERIFY IF GENERATOR OUTPUT IS AFFECTED BY DTC OCCURRING FROM DC-DC CONVERTER RELATED PART Switch the ignition off, then ON (engine off). Perform the DC-DC converter DTC inspection using the M-MDS. (See DTC INSPECTION [i-ELOOP].) Are any DTCs present? NOTE: If DTC P1628:11 is stored, perform the on-board diagnostic function first from DTC P1628:11.	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [i-ELOOP].) Go to the next step.
3		No	Go to the next step.
4	PURPOSE: VERIFY DTC Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].) Go to the troubleshooting procedure to perform the procedure from Step 1.
4		No	Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure (With i-ELOOP)

Intention of troubleshooting procedure

Step 1

Perform inspection of generator voltage.

Step 2—6

Perform inspection of each signal transmission system.

Step 7

Perform a unit inspection of the generator.

Step 8—10

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


STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: DETERMINE THE MALFUNCTION CAUSE BY VERIFYING THE OUTPUT VOLTAGE OF GENERATOR TERMINAL 1A. Start the engine. Measure the voltage at the generator terminal 1A (wiring harness-side). Is the voltage approx. 0 V?	Yes	Perform the troubleshooting procedure for DTC P2503:00. (See DTC P2503:00 [SKYACTIV-G 2.5].) Go to the next step.
1		No	Go to the next step.
2	PURPOSE: VERIFY IF POOR CONNECTION OF EACH PART AFFECTS DIAGNOSTIC RESULTS Switch the ignition off. Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Inspect the connection condition (part installation condition, connector connection condition) for the following parts: Battery Generator PCM Capacitor (i-ELOOP) DC-DC converter Is the connection condition (part installation condition, connector connection condition) for each part normal?	Yes	Go to the next step.
2		No	Connect each part or the connector correctly, then go to the next step.
3	PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS Disconnect the connector of the following parts. Battery Generator PCM Capacitor (i-ELOOP) DC-DC converter Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to the next step.
3		No	Go to the next step.
4	PURPOSE: INSPECT FUSE Remove the STARTER 250 A fuse. Inspect the STARTER 250 A fuse. Is there any malfunction?	Yes	If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter terminal 4A and battery positive terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Replace the malfunctioning fuse. If the fuse is damaged: Replace the fuse. Go to the next step.
4		No	Reinstall the STARTER 250 A fuse, then go to the next step.
5	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the battery, generator, PCM, capacitor (i-ELOOP), and DC-DC converter connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: DC-DC converter terminal 4A DC-DC converter terminal 3A DC-DC converter terminal 1I Generator terminal 1A Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: DC-DC converter terminal 4A—Battery positive terminal DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A DC-DC converter terminal 1I—PCM terminal 2L Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to the next step.
5		No	Go to the next step.
6	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the battery, generator, PCM, capacitor (i-ELOOP), and DC-DC converter connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): DC-DC converter terminal 4A—Battery positive terminal DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A DC-DC converter terminal 1I—PCM terminal 2L Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: DC-DC converter terminal 4A—Battery positive terminal DC-DC converter terminal 3A—Capacitor (i-ELOOP) terminal 3A DC-DC converter terminal 1I—PCM terminal 2L Capacitor (i-ELOOP) terminal 2A—Generator terminal 1A If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to the next step.
7	PURPOSE: DETERMINE INTEGRITY OF GENERATOR Inspect the generator. (See GENERATOR INSPECTION [i-ELOOP].) Is there any malfunction?	Yes	Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [i-ELOOP].)
7		No	Go to the next step.
8	PURPOSE: VERIFY CONDITIONS OF BATTERY Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.5].)	—	Follow the inspection instructions, then go to the next step.
9	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Always reconnect all disconnected connectors. Reconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 2.5].) Implement the repeatability verification procedure. (See Repeatability Verification Procedure (With i-ELOOP).) Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
9		No	Go to the next step.
10	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
10		No	DTC troubleshooting completed.

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