DTC P2503 [ZJ, Z6]

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DTC P2503 [ZJ, Z6]

B3E010202500W02

DTC P2503 | Charging system voltage low
--- | ---
DETECTION CONDITION | • The PCM needs more than 20 A from the generator, and determines that the generator output voltage is less than 8.5 V while the engine running.

POSSIBLE CAUSE

• Generator malfunction
• Drive belt misadjustment
• Connector or terminal malfunction
• Open circuit in wiring harness between generator terminal D and PCM terminal 2AN
• Short to GND in wiring harness between generator terminal D and PCM terminal 2AN
• Open circuit in wiring harness between generator terminal P and PCM terminal 2AR
• Short to GND in wiring harness between generator terminal P and PCM terminal 2AR
• PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service 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.
No | Go to the next step.
3 | INSPECT DRIVE BELT CONDITION • Verify that the drive belt auto tensioner indicator mark does not exceed the limit. (See DRIVE BELT INSPECTION [ZJ, Z6].) • Is the drive belt normal? | Yes | Go to the next step.
No | Replace and/or adjust the drive belt, then go to Step 8. (See DRIVE BELT REPLACEMENT [ZJ, Z6].)
4 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 8.
No | Go to the next step.
5 | INSPECT GENERATOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch 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 terminal, then go to Step 8.
No | Go to the next step.

6

INSPECT GENERAOR CIRCUIT FOR SHORT TO GND
• Turn the ignition switch to the ON position (Engine off).
• Inspect for continuity between the following terminals:

  - Generator terminal D (wiring harness-side) and body GND
  - Generator terminal P (wiring harness-side) and body GND

• Is there continuity?

Yes

Repair or replace the wiring harness for a possible short to GND, then go to Step 8.

No | Go to the next step.

7

INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the following terminals:

  - Generator terminal D (wiring harness-side) and PCM terminal 2AN (wiring harness-side)
  - Generator terminal P (wiring harness-side) and PCM terminal 2AR (wiring harness-side)

• Is there continuity?

Yes

Go to the next step.

No | Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8 | VERIFY TROUBLESHOOTING OF DTC P2503 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [ZJ, Z6].)
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [ZJ, Z6].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [ZJ, Z6].)
No | DTC troubleshooting completed.