DTC P2503:00 [MZR 1.6]

id0102h3709600

DTC P2503:00

Charging system voltage low input
DETECTION CONDITION
•  If 5 s or more have elapsed with the generator output voltage 8.49 V or lower and the battery output voltage 10 V or more even though the generator target output current while the engine is running is 19.5 A or more.
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
•  Drive belt exceed limit
•  Generator connector or terminals malfunction
•  PCM connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  Generator terminal 2B—PCM terminal 2AS
―  Generator terminal 2A—PCM terminal 2M
•  Open circuit in wiring harness between the following terminals:
―  Generator terminal 2B—PCM terminal 2AS
―  Generator terminal 2A—PCM terminal 2M
•  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.
No
Go to the next step.
2
INSPECT DRIVE BELT CONDITION
•  Verify that the drive belt auto tensioner indicator mark does not exceed limit.
•  Is the drive belt normal?
Yes
Go to the next step.
No
Replace the drive belt, then go to Step 8.
(See DRIVE BELT REMOVAL/INSTALLATION [MZR 1.6].)
3
INSPECT GENERATOR CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the generator connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 8.
No
Go to the next step.
4
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 8.
No
Go to the next step.
5
INSPECT GENERATOR CIRCUIT FOR SHORT TO GROUND
•  Verify that the generator and PCM connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  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:
•  Generator terminal 2B—PCM terminal 2AS
•  Generator terminal 2A—PCM terminal 2M
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.
No
Go to the next step.
6
INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT
•  Verify that the generator and PCM connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Generator terminal 2B—PCM terminal 2AS
―  Generator terminal 2A—PCM terminal 2M
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Generator terminal 2B—PCM terminal 2AS
•  Generator terminal 2A—PCM terminal 2M
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
INSPECT GENERATOR
•  Inspect the generator.
•  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].)
No
Go to the next step.
8
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the KOER self test.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.6].)
No
DTC troubleshooting completed.