DTC P2502:00 [PCM (SKYACTIV-D 2.2)]

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Note

•  To determine the malfunctioning part, proceed with the diagnostics from [Function inspection using M-MDS].

Details on DTCs

System malfunction location	Generator system: Malfunction in voltage generated by generator
Detection condition	Determination condition	•  The voltage generated by the generator is 17 V or more and the battery voltage is 11 V or less for a continuous specified time.
	Preconditions	•  Engine is running
	Determination period	•  5 s
	Drive cycle	•  1
	Self-test type	•  CMDTC self test
	Sensor/unit used	•  PCM •  Generator
Fail-safe	•  Inhibits engine-stop by i-stop control. •  Generator output control inhibited.
Vehicle status when DTCs are output	•  i-stop warning light (amber) flashes •  A warning message is displayed on the LCD in the 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 malfunction conditions. ―  A 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 •  STR 450 A fuse malfunction •  Short to ground in wiring harness between the following terminals: ―  Battery positive terminal and generator terminal 1A •  Open circuit in wiring harness between the following terminals: ―  Battery positive terminal and generator terminal 1A •  Battery malfunction •  Malfunction in generator •  PCM malfunction

System Wiring Diagram

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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 IF OTHER RELATED DTCs OCCURRED SIMULTANEOUSLY •  Perform the DTC inspection for the PCM using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) •  Has any DTC other than P2502:00 or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].) Go to the troubleshooting procedure to perform the procedure from Step 1.
		No	Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

―  Perform inspection of each signal transmission system.

―  Perform a unit inspection of the generator.

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

Step	Inspection	Results	Action
1	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.
		No	Connect each part or the connector correctly, then go to the next step.
2	PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS •  Disconnect the connectors of the following parts: ―  Battery ―  Generator ―  PCM •  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. •  Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to the next step.
3	PURPOSE: INSPECT FOR MALFUNCTION DUE TO BAD FUSE •  Remove the STR 450 A fuse. •  Inspect the STR 450 A fuse. •  Is the STR 450 A fuse normal?	Yes	After installing the STR 450 A fuse, go to the next step.
		No	If the fuse is blown: •  Refer to the wiring diagram and verify if there is a common connector between the battery positive terminal and generator terminal 1A. If there is a common connector: ―  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. ―  Repair or replace the malfunctioning location. If there is no common connector: ―  Repair or replace the wiring harness which is shorted to ground. ―  Replace the blown fuse. If the fuse is damaged: •  Replace the fuse. Go to Step 7.
4	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS •  Verify that the battery connector, generator connector, and the PCM connector are disconnected. •  Inspect for continuity between generator terminal 1A (vehicle wiring harness side) and ground. •  Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the battery positive terminal and generator terminal 1A. If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to ground. Go to the next step.
		No	Go to the next step.
5	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS •  Verify that the battery connector, generator connector, and the PCM connector are disconnected. •  Inspect wiring harness between positive battery terminal and generator terminal 1A (vehicle wiring harness side). •  Is there continuity?	Yes	Go to the next step.
		No	Inspect the STR 450 A fuse. If the fuse is blown: •  Repair or replace the wiring harness which is shorted to ground. •  Replace the fuse. If the fuse is damaged: •  Replace the fuse. If the fuse is normal: •  Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	PURPOSE: DETERMINE INTEGRITY OF GENERATOR •  Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-D 2.2].) •  Is the generator normal?	Yes	Go to the next step.
		No	Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
7	PURPOSE: VERIFY BATTERY CHARGE CONDITION •  Inspect the battery. (See BATTERY INSPECTION.)	—	Follow the inspection instructions, then go to the next step.
8	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION •  Reconnect all disconnected connectors and hoses. •  Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)].) •  Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) •  Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) •  Has DTC P2502:00 been recorded?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
		No	Go to the next step.
9	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION •  Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
		No	DTC troubleshooting completed.