| Mazda P2455 | Diesel particulate filter differential pressure sensor circuit high input |
|---|---|
|
DETECTION CONDITION
|
• The PCM monitors the diesel particulate filter differential pressure sensor signal. If the voltage at PCM terminal 207, 246 and 119 remains high, the PCM determines that there is a diesel particulate filter differential pressure sensor circuit malfunction.
|
|
POSSIBLE CAUSE
|
• Diesel particulate filter differential pressure sensor malfunction
• Connector or terminal malfunction
• Short to power supply in the wiring harness between diesel particulate filter differential pressure sensor terminal C and PCM terminal 246
• Open circuit in the wiring harness between diesel particulate filter differential pressure sensor terminal B and PCM terminal 119
• PCM malfunction
|
 |
|
Diagnostic procedure
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
|
1
|
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
|
Yes
|
Go to the next step.
|
|
No
|
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
|
||
|
2
|
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
|
Yes
|
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
|
|
No
|
Go to the next step.
|
||
|
3
|
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the M-MDS to the DLC-2.
• 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?
|
Yes
|
Go to the next step.
|
|
No
|
Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
|
||
|
4
|
CLASSIFY MALFUNCTION AS DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO POWER SUPPLY OR OTHER MALFUNCTION
• Turn the engine switch off.
• Disconnect the diesel particulate filter differential pressure sensor connector.
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between diesel particulate filter differential pressure sensor terminal A (wiring harness-side) and body ground.
• Is the voltage more than 5.0 V?
|
Yes
|
Go to the next step.
|
|
No
|
Go to Step 7.
|
||
|
5
|
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the engine switch off.
• Disconnect the diesel particulate filter differential pressure sensor connector and the PCM connector.
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between PCM terminal 207 (wiring harness-side) and body ground.
• Is the voltage more than 5.0 V?
|
Yes
|
Repair or replace the wiring harness between diesel particulate filter differential pressure sensor terminal A (wiring harness-side) and PCM terminal 207 (wiring harness-side), then go to Step 15.
|
|
No
|
Go to the next step.
|
||
|
6
|
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
|
Yes
|
Repair or replace the terminal, then go to Step 15.
|
|
No
|
Go to Step 15.
|
||
|
7
|
CLASSIFY MALFUNCTION AS DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY OR OTHER MALFUNCTION
• Turn the engine switch off.
• Disconnect the diesel particulate filter differential pressure sensor connector.
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between diesel particulate filter differential pressure sensor terminal C (wiring harness-side) and body ground.
• Is the voltage more than 5.0 V?
|
Yes
|
Go to the next step.
|
|
No
|
Go to Step 10.
|
||
|
8
|
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the engine switch off.
• Disconnect the diesel particulate filter differential pressure sensor connector and the PCM connector.
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between PCM terminal 246 (wiring harness-side) and body ground.
• Is the voltage more than 5.0 V?
|
Yes
|
Repair or replace the wiring harness between diesel particulate filter differential pressure sensor terminal C (wiring harness-side) and PCM terminal 246 (wiring harness-side), then go to Step 15.
|
|
No
|
Go to the next step.
|
||
|
9
|
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
|
Yes
|
Repair or replace the terminal, then go to Step 15.
|
|
No
|
Go to Step 15.
|
||
|
10
|
CLASSIFY MALFUNCTION AS DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR GROUND CIRCUIT FOR OPEN OR DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR MALFUNCTION
• Turn the engine switch off.
• Inspect for continuity between diesel particulate filter differential pressure sensor terminal B (wiring harness-side) and body ground.
• Is there continuity?
|
Yes
|
Go to Step 13.
|
|
No
|
Go to the next step.
|
||
|
11
|
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR GROUND CIRCUIT FOR OPEN
• Turn the engine switch off.
• Inspect for continuity between PCM terminal 119 (wiring harness-side) and body ground.
• Is there continuity?
|
Yes
|
Repair or replace the wiring harness between diesel particulate filter differential pressure sensor terminal B (wiring harness-side) and PCM terminal 119 (wiring harness-side), then go to Step 15.
|
|
No
|
Go to the next step.
|
||
|
12
|
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
|
Yes
|
Repair or replace the terminal, then go to Step 15.
|
|
No
|
Go to Step 15.
|
||
|
13
|
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the diesel particulate filter differential pressure sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
|
Yes
|
Repair or replace the terminal, then go to Step 15.
|
|
No
|
Go to the next step.
|
||
|
14
|
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR
• Inspect the diesel particulate filter differential pressure sensor.
• Is there any malfunction?
|
Yes
|
Replace the diesel particulate filter differential pressure sensor, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
15
|
VERIFY THAT DTC P2455 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?
|
Yes
|
Replace the PCM, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
16
|
VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC inspection.
|
|
No
|
DTC troubleshooting completed.
|
||