| Mazda P242F | Diesel particulate filter restriction-ash accumulation |
|---|---|
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DETECTION CONDITION
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• The PCM monitors the exhaust pressure before and after the diesel particulate filter, using the diesel particular filter differential pressure sensor. If the pressure difference is above calibrated value, the PCM determines that the diesel particulate filter is restricted by ash.
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POSSIBLE CAUSE
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• Particular filter differential pressure sensor malfunction
• Loose or poor installation particular filter differential pressure sensor downstream side pipe
• Exhaust gas leakage after diesel particular filter
• Diesel particulate filter restriction and/or damaged
• MAF sensor malfunction
• EGR system malfunction
• Air bypass valve malfunction
• Intake throttle malfunction
• Fuel additive system malfunction
• Base engine malfunction
• Scheduled maintenance does not have followed
• 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 P242F 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 15.
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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 15.
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6
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INSPECT EXHAUST GAS LEAKAGE
• Inspect the exhaust system for leakage at diesel particulate filter downstream side.
• Is there any leakage found diesel particulate filter downstream side?
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Yes
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Repair or replace malfunctioning part, then go to Step 15.
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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 PIPING DIESEL PARTICULATE FILTER DOWNSTREAM SIDE
• Inspect for connection and condition at exhaust differential pressure sensor downstream 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 15.
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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 the next step.
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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 the Step 15.
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10
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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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11
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INSPECT EGR VALVE OPERATION
• Remove the EGR valve with connector connected.
• Turn the engine switch to the ON position (Engine off).
• Access EgrDc PID.
• Visually inspect the EGR valve operation using EgrDc PID of simulation function.
• Does the EGR 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 EGR valve. Retest the step 11.
If the EGR valve moves smoothly, go to Step 15.
If the EGR valve does not move smoothly, inspect the EGR valve.
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12
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INSPECT INTAKE THROTTLE VALVE OPERATION
• Remove the EGR valve with connector connected.
• Turn the engine switch to the ON position (Engine off).
• Access EgrDc PID.
• Visually inspect the EGR valve operation using EgrDc PID of simulation function.
• Does the EGR 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 12.
If the intake throttle valve moves smoothly, go to Step 15.
If the intake throttle valve does not move smoothly, inspect the intake throttle valve.
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13
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INSPECT AIR BYPASS VALVE OPERATION
• Remove the air bypass valve with connector connected.
• Turn the engine switch to the ON position (Engine off).
• Access CABVP PID.
• Visually inspect the air bypass valve operation using CABVP PID of simulation function.
• Visually inspect the air bypass valve operation using CABVP PID of simulation function.
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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 air bypass valve. Retest the step 13.
If the air bypass valve moves smoothly, go to Step 15.
If the air bypass valve does not move smoothly, inspect the air bypass valve.
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14
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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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15
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VERIFY THAT DTC P242F 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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16
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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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