Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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1
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PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
(See DTC CONFIRMATION PROCEDURE.)
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
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2
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INSPECT GENERATOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the generator connector.
• Inspect for poor connection (such as damaged, pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace terminals, then go to Step 7.
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No
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Go to the next step.
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3
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CLASSIFY GENERATOR MALFUNCTION OR OTHER MALFUNCTION
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between generator terminal D (wiring harness-side) and body ground.
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Malfunction at generator.
Go to Step 6.
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4
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INSPECT PCM FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged, pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the pins, then go to Step 7.
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No
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Go to the next step.
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5
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INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the ON position (engine off).
• Measure the voltage between generator terminal D (wiring harness-side) and body ground.
• Is the voltage B+?
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Yes
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Repair or replace the wiring harness for short to power, then go to Step 7.
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No
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Go to Step 7.
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6
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INSPECT GENERATOR CONTROL TERMINAL FOR SHORT TO POWER
• Measure resistance between generator terminal D (part-side) and body ground.
• Is the voltage B+?
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Yes
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Repair or replace the generator, then go to Step 7.
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No
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Go to the next step.
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7
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VERIFY TROUBLESHOOTING OF DTC P2504 COMPLETED
• Make sure to reconnect all connectors.
• Clear the DTC from PCM memory using WDS or equivalent.
• Perform the KOER self-test.
(See KOEO/KOER SELF-TEST.)
• Is the same DTC present?
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Yes
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Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION.)
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No
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Go to the next step.
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8
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VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See AFTER REPAIR PROCEDURE.)
• Are any DTCs present?
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Yes
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Go to the applicable DTC troubleshooting.
(See DTC TABLE.)
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No
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Troubleshooting completed.
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