| DTC P0089 | Fuel Pressure Regulator Performance |
|---|---|
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DETECTION CONDITION
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• PCM detects the fuel pressure at the common rail for the following while the engine is running, the PCM determines that the fuel system pressure is not controlled properly.
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POSSIBLE CAUSE
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• Erratic signal the from fuel pressure sensor to PCM
• Fuel metering control valve or related circuit malfunction
• Fuel leakage from the fuel injector
• Fuel leakage or clogging in fuel system
• Supply pump malfunction
• Fuel pressure limiter malfunction
• Improper operation of fuel injection control
• PCM malfunction
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Diagnostic procedure
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the 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 the FREEZE FRAME DATA on the repair order, then go to the next step.
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|
2
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VERIFY REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair 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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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is P0191, P0192, P0193, P0201, P0202, P0203 or P0204 on the FREEZE FRAME DATA?
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Yes
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Go to the applicable DTC inspection.
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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 LINE
• Turn the engine switch off.
• Inspect for leakage or clogs in the following fuel lines for each cylinder:
• Is there any malfunction?
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Yes
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Repair or replace the suspected fuel line, then go to Step 8.
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No
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Go to the next step.
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5
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INSPECT FUEL METERING CONTROL VALVE
• Inspect the fuel metering control valve.
• Is there any malfunction?
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Yes
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Replace the supply pump, then go to Step 8.
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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 PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is there any malfunction?
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Yes
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Replace the common rail, then go to Step 8.
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No
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Go to the next step.
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7
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INSPECT FUEL INJECTOR
• Inspect the fuel injector.
• Is there any malfunction?
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Yes
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Replace the fuel injector, then go to the next step.
|
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No
|
Inspect the following:
• Supply pump
• Fuel pressure limit
If there is a malfunction, repair or replace.
Then go to the next step.
If it is normal, go to the next step.
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8
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VERIFY THAT DTC P0089 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine and warm-up to normal operating temperature.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Retrieve DTCs using the M-MDS.
• Is the PENDING CODE same DTC present?
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Yes
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Replace 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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9
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VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
• Is there any DTC present?
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Yes
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Go to the applicable DTC inspection.
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No
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Troubleshooting completed.
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