DTC P0231 [MZI-3.7]
id0102d2819800
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DTC P0231 |
FP secondary circuit low |
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DETECTION CONDITION
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• The PCM monitors the fuel pump monitor circuit. The test fails if the PCM commands the fuel pump ON and B+ voltage is not detected on the FPM circuit.
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POSSIBLE CAUSE
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• Fuel pump relay malfunction
• Connector or terminal malfunction
• Open circuit between battery and fuel pump relay terminal C
• Open circuit between fuel pump relay terminal D and PCM terminal 1Q
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTC
• Verify the related PENDING CODE or stored DTCs.
• Are other DTCs present?
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Yes
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Go to appropriate DTC inspection.
(See DTC TABLE [MZI-3.7].)
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No
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Go to the next step.
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4
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INSPECT FUEL PUMP RELAY CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the fuel pump relay.
• Inspect for poor connection (such as damaged/ pulled-out pins, corrosion).
• Are there malfunction?
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Yes
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Repair or replace suspected part, then go to Step 9.
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No
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Go to the next step.
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5
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect PCM connector.
• Inspect for poor connection (such as damaged/ pulled-out pins, corrosion).
• Are there malfunction?
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Yes
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Repair or replace suspected part, then go to Step 9.
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No
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Go to the next step.
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6
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INSPECT FUEL PUMP RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch to the ON position (Engine off).
• Measure voltage between fuel pump relay connector terminal C (wiring harness-side) and body ground.
• Is 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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Repair or replace suspected part, then go to Step 9.
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7
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INSPECT FUEL PUMP MONITOR CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect continuity between fuel pump relay terminal D (wiring harness-side) and PCM terminal 1Q (wiring harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace suspected part, then go to Step 9.
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8
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INSPECT FUEL PUMP RELAY
• Inspect the fuel pump relay.
(See RELAY INSPECTION.)
• Is there any malfunction?
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Yes
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Replace the fuel pump relay, then go to the next step.
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No
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Go to the next step.
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9
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VERIFY TROUBLESHOOTING OF DTC P0231 HAS BEEN COMPLETED
• Verify that all disconnected connectors reconnected.
• Clear DTC from memory using the M-MDS.
• Start the engine.
• Perform the “KOEO/KOER self-test”
• Is same DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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10
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7].)
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No
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Troubleshooting completed.
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