| Mazda P2458 | Diesel particulate filter regeneration duration |
|---|---|
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DETECTION CONDITION
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• The PCM monitors the diesel particulate filter regeneration duration using the exhaust differential pressure sensor. If the exhaust differential pressure sensor signal high condition is longer than specified period. The PCM determines that the diesel particulate filter regeneration duration is too long.
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POSSIBLE CAUSE
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• EGR valve stuck
• Air bypass valve stuck
• Intake throttle valve stuck
• Exhaust gas leakage in exhaust system before diesel particulate filter
• Improper connection at exhaust differential pressure sensor upstream side pipe
• Diesel particulate filter malfunction
• Exhaust differential pressure sensor malfunction
• Fuel additive system malfunction
• Low engine compression
• No fuel additive in fuel additive tank
• Scheduled maintenance does not have followed
• MAF sensor malfunction
• FACM malfunction
• 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 P2458 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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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 17.
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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 17.
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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 17.
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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 17.
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No
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Go to the next step.
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8
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INSPECT MAF PID VALUE
• Access MAF PID.
• Start the engine.
• Monitor the MAF PID.
• Is the MAF PID value within the specified?
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Yes
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Go to the next step.
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No
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Inspect and replace the MAF sensor, then go to Step 15.
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9
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VERIFY AIR BYPASS VALVE POSITION
• Access CABVDC PID using the M-MDS.
• Start the engine and monitor the CABVDC PID.
• Is the CABVDC PID value specified?
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Yes
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Go to the next step.
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No
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Remove and inspect air bypass valve for stuck.
If stuck is found, repair or replace malfunctioning part.
If stuck is not found, go to the next step.
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10
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INSPECT AIR BYPASS VALVE OPERATION
• Perform the air bypass valve operation inspection.
• Does the air bypass valve operate properly?
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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 malfunctioning part according to inspection result, then go to Step 17.
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11
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VERIFY EGR VALVE POSITION
• Access EgrDc PID using the M-MDS.
• Start the engine and monitor the EgrDc PID.
• Is the EgrDc PID value specified?
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Yes
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Go to the next step.
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No
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Remove and inspect EGR valve for stuck.
If stuck is found, repair or replace malfunctioning part.
If stuck is not found, go to the next step.
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12
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INSPECT EGR VALVE OPERATION
• Perform the EGR valve operation inspection.
• Does the EGR valve operate properly?
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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 malfunctioning part according to inspection result, then go to Step 17.
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13
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INSPECT INTAKE THROTTLE VALVE OPERATION
• Remove the intake throttle valve with connector connected.
• Turn the engine switch to the ON position (Engine off).
• Access EGR_TV PID.
• Visually inspect the intake throttle valve operation using EGR_TV PID of simulation function.
• Does the intake throttle valve move smoothly?
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Yes
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Go to the next step.
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No
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Clean the intake throttle valve.
Retest the step 13.
If the intake throttle valve moves smoothly, go to Step 17.
If the intake throttle valve does not move smoothly, inspect the intake throttle valve.
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14
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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 17.
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15
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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 the Step 17.
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16
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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 additive 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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17
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VERIFY THAT DTC P2458 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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18
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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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