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DTC P2503:00 [PCM (SKYACTIV-G 2.0)]

NOTE:

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

Details On DTCs

DESCRIPTION	Generator system: Voltage generated by generator is low
DETECTION CONDITION	Determination conditions	A condition continues for a specified period of time in which the target generator output current calculated by the PCM is 20 A or more and the generator output voltage is 8.5 V or less.
	Preconditions	While engine is running
	Malfunction determination period	5 s period
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	PCM Generator
FAIL-SAFE FUNCTION	Generator control is inhibited.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	A warning message is displayed in the display. (With center display) Illuminates charging system warning light. 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: Battery Generator PCM Connector or terminal malfunction of the following parts: Battery Generator PCM STR/ALT 200 A fuse malfunction Short to ground in wiring harness between the following terminals: Battery positive terminal—Generator terminal 1A Generator terminal 2B—PCM terminal 1BE Generator terminal 2A—PCM terminal 1AF Open circuit in wiring harness between the following terminals: Battery positive terminal—Generator terminal 1A Generator terminal 2B—PCM terminal 1BE Generator terminal 2A—PCM terminal 1AF Drive belt exceeds limit Generator malfunction Battery malfunction PCM malfunction

System Wiring Diagram

Function Explanation (DTC Detection Outline)

When the charge/discharge circuit for the power supplying the vehicle is normal, the vehicle will operate normally.

Although a power generation command is made to the generator, a malfunction is diagnosed indicating no output from the generator, and verification of vehicle malfunctions/safety assurance is performed.

Repeatability Verification Procedure

Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)

Start the engine.

Leave for 30 s while idling with high electrical load.

PID Item/Simulation Item Used In Diagnosis

Not applicable

Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION

PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION

NOTE:

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

Record the snapshot data on the repair order.

—

Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

Step 1—6

Perform an inspection of each signal transmission system.

Step 7

Perform a generator drive belt related inspection.

Step 8

Perform a unit inspection of the generator.

Step 9—11

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 9.
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 9.
3		No	Go to the next step.
4	PURPOSE: INSPECT FUSE Remove the STR/ALT 200 A fuse. Inspect the STR/ALT 200 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 fuse. If the fuse is damaged: Replace the fuse. Go to Step 9.
4		No	Reinstall the STR/ALT 200 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 and PCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Generator terminal 1A Generator terminal 2B Generator terminal 2A Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Battery positive terminal—Generator terminal 1A Generator terminal 2B—PCM terminal 1BE Generator terminal 2A—PCM terminal 1AF 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 9.
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 and PCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Battery positive terminal—Generator terminal 1A Generator terminal 2B—PCM terminal 1BE Generator terminal 2A—PCM terminal 1AF 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: Battery positive terminal—Generator terminal 1A Generator terminal 2B—PCM terminal 1BE Generator terminal 2A—PCM terminal 1AF 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 9.
7	PURPOSE: VERIFY IF MALFUNCTION RELATED TO GENERATOR DRIVE BELT AFFECTS DIAGNOSTIC RESULTS Inspect the generator drive belt. (See DRIVE BELT INSPECTION [SKYACTIV-G 2.0].) Is the indicator mark on the drive belt auto tensioner within the normal range?	Yes	Go to the next step.
7		No	Replace the generator drive belt, then go to the next step. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
8	PURPOSE: DETERMINE INTEGRITY OF GENERATOR Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.0].) Is there any malfunction?	Yes	Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
8		No	Go to the next step.
9	PURPOSE: VERIFY CONDITIONS OF BATTERY Inspect the battery. (See BATTERY INSPECTION.)	—	Follow the inspection instructions, then go to the next step.
10	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 [PCM (SKYACTIV-G 2.0)].) Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) 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 2.0].) Go to the next step.
10		No	Go to the next step.
11	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 [PCM (SKYACTIV-G 2.0)].)
11		No	DTC troubleshooting completed.

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