DTC P0340 [MZ-CD 1.6 (Y6) (EURO4 emission level)]


id0102g6807000

DTC P0340

Camshaft position (CMP) sensor circuit malfunction

DETECTION CONDITION
•  The PCM monitors the CMP sensor signal. If there is no CMP sensor signal, the PCM determines that the CMP sensor circuit has a malfunction.
POSSIBLE CAUSE
•  CMP sensor connector or terminal malfunction
•  Short to power supply between CMP sensor terminal A and PCM terminal 237
•  Short to power supply between CMP sensor terminal B and PCM terminal 240
•  Short to power supply between CMP sensor terminal C and PCM terminal 206
•  Short to ground between CMP sensor terminal B and PCM terminal 240
•  Short to ground between CMP sensor terminal C and PCM terminal 206
•  CMP sensor pulse wheel malfunction
•  CMP sensor malfunction
•  PCM connector or terminal malfunction
•  Open circuit between CMP sensor terminal A and PCM terminal 237
•  Open circuit between CMP sensor terminal B and PCM terminal 240
•  Open circuit between CMP sensor terminal C and PCM terminal 206
•  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.
No
Go to the next step.
4
INSPECT CMP SENSOR CONNECTOR CONDITION
•  Switch the ignition to OFF.
•  Disconnect the CMP 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 11.
No
Go to the next step.
5
INSPECT CMP SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Disconnect the CMP sensor and PCM connectors.
•  Switch the ignition to ON (engine off).
•  Measure the voltage between the following terminals (wiring harness-side):
―  CMP sensor terminal A
―  CMP sensor terminal B
―  CMP sensor terminal C
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 11.
No
Go to the next step.
6
INSPECT CMP SENSOR CIRCUIT FOR SHORT TO GROUND
•  Switch the ignition to OFF.
•  Disconnect the CMP sensor connector.
•  Inspect for continuity between CMP sensor and body ground at following wiring harness-side connector:
―  CMP sensor terminal B
―  CMP sensor terminal C
•  Is there continuity?
Yes
If the short to ground circuit could be detected:
•  Repair or replace the wiring harness for a possible short to ground.
If the short to ground circuit could not be detected:
•  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 11.
No
Go to the next step.
7
INSPECT CMP SENSOR PULSE WHEEL
•  Visually inspect the CMP sensor pulse wheel (crankshaft pulley).
•  Is there any malfunction?
Yes
Replace the camshaft pulley, then go to Step 11.
No
Go to the next step.
8
INSPECT CMP SENSOR
•  Is there any malfunction?
Yes
Replace the CMP sensor, then go to Step 11.
No
Go to the next step.
9
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 Step 11.
No
Go to the next step.
10
INSPECT CMP SENSOR CIRCUIT FOR OPEN
•  Inspect for continuity between CMP sensor and PCM at following wiring harness-side connector:
―  CMP sensor terminal A and PCM terminal 237
―  CMP sensor terminal B and PCM terminal 240
―  CMP sensor terminal C and PCM terminal 206
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, go to the next step.
11
VERIFY THAT DTC P0340 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.
12
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.