DTC P2178:00 [MZ-CD 1.6]
id0102g8709000
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DTC P2178:00 |
System too rich off idle |
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DETECTION CONDITION
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• The PCM monitors the oxygen concentration using the A/F sensor. If the measured value or calculated value of the oxygen concentration when driving under a load is lower than the threshold value, the PCM determines that the system is too rich.
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POSSIBLE CAUSE
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• Engine oil deterioration (High amount of fuel mixed in engine oil)
• Fuel injector malfunction
• Air restriction or leakage at intake-air system
• A/F sensor malfunction
• Fuel injection pump learned values reset improper
• Supply pump malfunction
• PCM malfunction
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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 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 RELATED PENDING CODE AND/OR DTC
• Switch the ignition to off, then to ON (engine off).
• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
• Is the other PENDING CODE/DTC also present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
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No
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Go to the next step.
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4
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VERIFY ENGINE OIL CONDITION
• Verify the engine oil condition (amount, color, smell)
• Is the engine oil condition normal?
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Yes
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Go to the next step.
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No
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Replace the engine oil, then go to Step 9.
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5
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INSPECT FUEL INJECTOR
• Inspect the fuel injectors.
• Is there any malfunction?
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Yes
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Replace the fuel injector, 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 AIR RESTRICTION OR LEAKAGE AT INTAKE-AIR SYSTEM
• Inspect the intake-air system for air restriction or leakage.
• Is there any air restriction or leakage?
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Yes
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Repair or replace malfunctioning part, then go to Step 9.
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No
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Go to the next step.
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7
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INSPECT A/F SENSOR
• Inspect the A/F sensor.
• Is there any malfunction?
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Yes
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Replace the A/F sensor, then go to Step 9.
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No
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Go to the next step.
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8
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PERFORM FUEL INJECTION PUMP LEARNED VALUES RESET
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the FUEL INJECTION PUMP LEARNED VALUES RESET.
• 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 supply pump.
(Fuel metering valve malfunction)
Then go to the next step.
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No
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Go to Step 10.
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9
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VERIFY THAT DTC P2178:00 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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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the PCM.
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 [MZ-CD 1.6].)
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No
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DTC troubleshooting completed.
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