DTC P2502:00 [MZR 1.6]

id0102h3709500

DTC P2502:00

Charging system voltage problem

DETECTION CONDITION

•  The PCM determines that the generator output voltage is 17 V or more or the battery voltage is 11 V or less while the engine running.

Diagnostic support note

•  This is continuous monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

•  DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Battery malfunction

•  Generator terminal 1A installation nut looseness

•  Battery positive terminal looseness

•  Open circuit or short to ground in generator power supply 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

•  PCM malfunction

DTC P2502:00	Charging system voltage problem
DETECTION CONDITION	• The PCM determines that the generator output voltage is 17 V or more or the battery voltage is 11 V or less while the engine running. Diagnostic support note • This is continuous monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Battery malfunction • Generator terminal 1A installation nut looseness • Battery positive terminal looseness • Open circuit or short to ground in generator power supply 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 • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	INSPECT BATTERY • Switch the ignition off. • Inspect the battery. (See BATTERY INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 7. (See BATTERY RECHARGING [MZR 1.6].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.6].)
2		No	Go to the next step.
3	INSPECT POOR INSTALLATION NUT OF GENERATOR TERMINAL 1A • Switch the ignition off. • Inspect the generator terminal 1A installation nut for looseness. • Is the nut loose?	Yes	Retighten the generator terminal 1A installation nut, then go to Step 7.
3		No	Go to the next step.
4	INSPECT POOR INSTALLATION OF BATTERY POSITIVE TERMINAL • Inspect the battery positive terminal for looseness. • Is the terminal loose?	Yes	Connect the battery positive terminal correctly, then go to Step 7.
4		No	Go to the next step.
5	INSPECT BATTERY CHARGING CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Disconnect the generator terminal 1A. • Measure the voltage at the generator terminal 1A (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the STARTER 250 A fuse. • 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. • If the fuse is normal: ― 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 7.
6	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [MZR 1.6].) (See GENERATOR DISASSEMBLY/ASSEMBLY [MZR 1.6].)
6		No	Go to the next step.
7	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [MZR 1.6].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].) Go to the next step.
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.6].)
8		No	DTC troubleshooting completed.