| DTC P0088 | Fuel rail pressure – too high |
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DETECTION CONDITION
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• The PCM monitors the fuel pressure in the common rail from the fuel pressure sensor while the engine is running. If the fuel pressure is more than threshold, the PCM determines that the fuel pressure is too high.
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POSSIBLE CAUSE
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• Fuel metering valve malfunction (built-in fuel pump)
• Fuel pump malfunction
• Fuel pressure sensor malfunction
• Fuel injector malfunction
• Fuel injector improper connection
• Leakage or clogging in fuel line
• Fuel pipe improper connection on the fuel tank
• 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 RELATED 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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VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the M-MDS to DLC-2.
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine.
• Retrieve the DTC.
• Is the same DTC retrieved?
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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.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is P0191, P0192, P0193, P0251, P0253 or P0254 on 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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5
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INSPECT FUEL PIPE CONNECTION ON FUEL TANK
• Inspect the fuel pipes for supply and return connection at fuel tank.
• Are fuel pipes connected properly?
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Yes
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Go to the next step.
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No
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Reconnect fuel pipes properly, then go to Step 11.
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6
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INSPECT FUEL LINE
• Turn the engine switch off.
• Inspect for fuel leakage or clogging in the following fuel lines for each cylinder:
• Is there any malfunction?
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Yes
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Repair or replace suspect fuel line, then go to Step 11.
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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 METERING VALVE
• Inspect the fuel metering valve.
• Is there any malfunction?
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Yes
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Replace the fuel pump, then go to Step 11.
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No
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Go to the next step.
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8
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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 11
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No
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Go to the next step.
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9
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INSPECT COMMON RAIL
• Inspect the common rail.
• Is there any malfunction?
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Yes
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Replace the common rail, then go to Step 11
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No
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Go to the next step.
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10
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INSPECT FUEL INJECTOR
• Inspect the fuel injector for each cylinder.
• Is there any malfunction?
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Yes
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Replace the suspect fuel injector, then go to the next step.
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No
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Go to the next step.
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11
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VERIFY THAT DTC P0088 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the 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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12
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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.
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No
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DTC troubleshooting completed.
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