DTC P06A7:00 [MZ-CD 1.6]

id0102g8361400

DTC P06A7:00

Sensor reference circuit range/performance
DETECTION CONDITION
•  The PCM monitors the sensor reference voltage from the diesel particulate filter differential pressure sensor, refrigerant pressure sensor and EGR cooler bypass valve position sensor. If the power supply voltages for the differential pressure sensor, A/C pressure sensor, and EGR cooler bypass valve position sensor are not within 4.7-5.3 V, the PCM determines that there is a malfunction in the sensor reference circuit.
POSSIBLE CAUSE
•  Diesel particulate filter differential pressure sensor connector or terminal malfunction
•  Refrigerant pressure sensor connector or terminal malfunction
•  EGR cooler bypass valve position sensor connector or terminal malfunction
•  Short to power supply in wiring harness between diesel particulate filter differential pressure sensor terminal C and PCM terminal 221
•  Short to power supply in wiring harness between refrigerant pressure sensor terminal D and PCM terminal 333
•  Short to power supply in wiring harness between EGR cooler bypass valve position sensor terminal A and PCM terminal 239
•  Short to ground in wiring harness between diesel particulate filter differential pressure sensor terminal C and PCM terminal 221
•  Short to ground in wiring harness between refrigerant pressure sensor terminal D and PCM terminal 333
•  Short to ground in wiring harness between EGR cooler bypass valve position sensor terminal A and PCM terminal 239
•  Diesel particulate filter differential pressure sensor malfunction
•  Refrigerant pressure sensor malfunction
•  EGR cooler bypass valve position sensor malfunction
•  PCM connector or terminal malfunction
•  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 RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the other PENDING CODE/DTC also present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
Go to the next step.
4
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR CONNECTOR CONDITION
•  Switch the ignition to 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 connector and/or terminals, then go to Step 17.
No
Go to the next step.
5
INSPECT REFRIGERANT PRESSURE SENSOR CONNECTOR CONDITION
•  Disconnect the refrigerant pressure sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 17.
No
Go to the next step.
6
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR CONNECTOR CONDITION
•  Disconnect the EGR cooler bypass valve position sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 17.
No
Go to the next step.
7
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON (engine off).
•  Disconnect the diesel particulate filter differential pressure sensor connector.
•  Measure the voltage at the diesel particulate filter differential pressure sensor terminal B (wiring harness-side).
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 17.
No
Go to the next step.
8
INSPECT REFRIGERANT PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON (engine off).
•  Disconnect the refrigerant pressure sensor connector.
•  Measure the voltage at the refrigerant pressure sensor terminal A (wiring harness-side).
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 17.
No
Go to the next step.
9
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR POWER CIRCUIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON (engine off).
•  Disconnect the EGR cooler bypass valve position sensor connector.
•  Measure the voltage at the refrigerant pressure sensor terminal A (wiring harness-side).
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 17.
No
Go to the next step.
10
INSPECT DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO GROUND
•  Disconnect the diesel particulate filter differential pressure sensor connector.
•  Inspect for continuity between diesel particulate filter differential pressure sensor terminal B (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 17.
No
Go to the next step.
11
INSPECT REFRIGERANT PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO GROUND
•  Disconnect the refrigerant pressure sensor connector.
•  Inspect for continuity between refrigerant pressure sensor terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 17.
No
Go to the next step.
12
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR POWER CIRCUIT FOR SHORT TO GROUND
•  Disconnect the EGR cooler bypass valve position sensor connector.
•  Inspect for continuity between EGR cooler bypass valve position sensor terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 17.
No
Go to the next step.
13
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 Step 17.
No
Go to the next step.
14
INSPECT REFRIGERANT PRESSURE SENSOR
•  Inspect the refrigerant pressure sensor.
•  Is there any malfunction?
Yes
Replace the refrigerant pressure sensor, then go to Step 17.
No
Go to the next step.
15
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR
•  Inspect the EGR cooler bypass valve position sensor.
•  Is there any malfunction?
Yes
Replace the EGR cooler bypass valve position sensor, then go to Step 17.
No
Go to the next step.
16
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to the next step.
No
Go to the next step.
17
VERIFY THAT DTC P06A7:00 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?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
18
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
DTC troubleshooting completed.