DTC P0340: Camshaft Position Sensor "A" Circuit Bank 1 Or Single Sensor: Notes

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Engine stall
Failure of engine to start
Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

IMPREZA MODEL

Courtesy of SUBARU OF AMERICA, INC.

CROSSTREK MODEL

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

CHECK POWER SUPPLY OF CAMSHAFT POSITION SENSOR RH .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from camshaft position sensor RH.
3. Turn the ignition switch to ON.
4. Measure the voltage between camshaft position sensor RH connector and engine ground.
  Connector and terminal
  
  (E36) No. 1 (+) - Engine ground (-):
Is the voltage 10 V or more?

Yes: Go to 2.

No: Repair the harness and connector.
NOTE:
In this case, repair the following item:
- Open circuit or short circuit to ground in harness between main relay connector and camshaft position sensor RH connector
- Poor contact of coupling connector
- Poor contact of J/C
CHECK HARNESS BETWEEN ECM AND CAMSHAFT POSITION SENSOR RH (OPEN) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance between ECM connector and camshaft position sensor RH connector.
  Connector and terminal
  
  (E158) No. 78 - (E36) No. 2:
  
  (E158) No. 51 - (E36) No. 3:
Is the resistance less than 1 Ω?

Yes: Go to 3.

No: Repair the harness and connector.
NOTE:
In this case, repair the following item:
- Open circuit in harness between ECM connector and camshaft position sensor RH connector
- Poor contact of J/C
CHECK HARNESS BETWEEN ECM AND CAMSHAFT POSITION SENSOR RH (SHORT TO GROUND) .
Measure the resistance between camshaft position sensor RH connector and engine ground.

Connector and terminal

(E36) No. 2 - Engine ground:

Is the resistance 1 MΩ or more?

Yes: Go to 4.

No: Repair short circuit to ground in harness between ECM connector and camshaft position sensor RH connector.
CHECK HARNESS BETWEEN ECM AND CAMSHAFT POSITION SENSOR RH (SHORT TO POWER SUPPLY) .
Measure the voltage between camshaft position sensor RH connector and engine ground.

Connector and terminal

(E36) No. 2 (+) - Engine ground (-):

Is the voltage 5 V or more?

Yes: Repair the short circuit to power in the harness between ECM connector and camshaft position sensor RH connector.

No: Go to 5.
CHECK CONDITION OF CAMSHAFT POSITION SENSOR RH .
1. Turn the ignition switch to OFF.
2. Check the installation condition of camshaft position sensor RH.
Is the camshaft position sensor RH installation bolt tightened securely?

Yes: Go to 6.

No: Tighten the camshaft position sensor RH installation bolt securely. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR>INSTALLATION .
CHECK CAMSHAFT POSITION SENSOR RH .
Check the waveform of the camshaft position sensor RH. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>CONTROL MODULE I/O SIGNAL .

Is there any abnormality in waveform?

Yes: Replace the camshaft position sensor RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR .

No: Repair the following item.
- Poor contact of ECM connector
- Poor contact of camshaft position sensor RH connector
- Poor contact of coupling connector
- Poor contact of J/C