DTC P2504

Charging system voltage high

DETECTION CONDITION

• PCM judges generator output voltage is above 18.5 V or battery voltage is above 16.0 V during engine running.

Diagnostic support note

• This is a continuous monitor (Other).

• The MIL does not illuminate.

• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA is available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Short to power circuit between generator connector terminal D and PCM connector terminal 2AI

• Generator malfunction

• PCM and/or generator are poorly connected

STEP

INSPECTION

ACTION

1

• 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 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.

No

Go to the next step.

3

• Turn the ignition switch off.

• Disconnect the generator connector.

• Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.).

• Is there any malfunction?

Yes

Repair or replace the terminals, then go to Step 8.

No

Go to the next step.

4

• Turn the ignition switch to the ON (Engine off).

• Measure the voltage between generator terminal D (wiring harness-side) and body ground.

• Is the voltage B+?

Yes

Go to the next step.

No

There is a malfunction at the generator.

Go to Step 7.

5

• Turn the ignition switch off.

• Disconnect the PCM connector.

• Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.).

• Is there any malfunction?

Yes

Repair or replace pins, then go to Step 8.

No

Go to the next step.

6

• Turn the ignition switch to the ON (engine off).

• Measure the voltage between generator terminal D (wiring harness-side) and body ground.

• Is the voltage B+?

Yes

Repair or replace the wiring harness for short to power supply, then go to Step 8.

No

Go to Step 8.

7

• Measure the voltage between generator terminal D (part-side) and body ground.

• Is the voltage B+?

Yes

Repair or replace the generator, then go to the next step.

No

Go to the next step.

8

• Make sure to reconnect all connectors.

• Clear the DTC from the PCM memory using the M-MDS.

• Start the engine, or perform the KOER self-test with M-MDS.

  (See KOEO/KOER SELF TEST [LF].)

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

9

• Perform “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [LF].)

• Is any DTC present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.