| Mazda P2459 | Diesel particulate filter regeneration frequency |
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DETECTION CONDITION
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• The PCM monitors the diesel particulate filter regeneration frequency using the exhaust differential pressure sensor. If the diesel particulate filter regeneration interval is shorter than threshold, the PCM determines that the diesel particulate filter regeneration frequency is too short.
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POSSIBLE CAUSE
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• Fuel injection system malfunction
• Diesel particulate filter malfunction
• Exhaust gas leakage in exhaust system before diesel particulate filter
• Improper connection at exhaust differential pressure sensor upstream side pipe
• Low engine compression
• Scheduled maintenance does not have followed
• 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 P2459 on FREEZE FRAME DATA?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE[MZ-CD 1.6 (Y6)].)
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No
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Go to the next step.
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4
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CHECK PCL LAMP STATE
• Start the engine.
• Check the PCL lamp state.
• Does the PCL lamp illuminate?
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Yes
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Refill the fuel additive, then go to Step 11.
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No
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Go to the next step.
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5
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VERIFY VEHICLE SCHEDULED MAINTENANCE
• Verify vehicle has followed scheduled maintenance items below:
• Does the vehicle have followed these items?
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Yes
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Go to the next step.
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No
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Followed the scheduled maintenance, then go to Step 11.
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6
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INSPECT EXHAUST GAS LEAKAGE
• Inspect the exhaust system for leakage.
• Is there any leakage found around diesel particulate filter and exhaust manifold?
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Yes
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Repair or replace malfunctioning part, 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 EXHAUST DIFFERENTIAL PRESSURE SENSOR UPSTREAM SIDE PIPING
• Inspect for connection and condition at exhaust differential pressure sensor upstream side piping.
• Is there any clacked and/or damaged found?
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Yes
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Repair or replace for malfunctioning part, 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 EXHAUST DIFFERENTIAL PRESSURE SENSOR
• Inspect the exhaust differential pressure sensor.
• Is the differential pressure sensor 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 exhaust differential pressure sensor, then go to Step 11.
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9
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INSPECT FOR RESTRICTION OR CLOGGED IN DIESEL PARTICULATE FILTER
• Access DPF_DIF PID using the M-MDS.
• Start the engine.
• Monitor DPF_DIF PID.
• Is the DPF_DIF PID value below specified?
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Yes
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Go to the next step.
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No
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Replace diesel particulate filter, then go to Step 11.
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10
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INSPECT FOR ENGINE COMPRESSION
• Inspect the engine compression for all cylinders.
• Are the engine compression pressures within the specified?
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Yes
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Inspect and repair for the fuel system Then go to the next step.
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No
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Repair or overhaul engine according to inspection results, then go to the next step.
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11
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VERIFY THAT DTC P2459 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 the DTC 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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12
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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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