P0340

P0340 CMP Sensor (PHASE)

Component Description

The camshaft position sensor (PHASE) senses the retraction with camshaft (intake) to identify a particular cylinder. The camshaft position sensor (PHASE) senses the piston position.





When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor (PHASE) provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

The sensor consists of a permanent magnet and Hall IC.

When engine is running, the high and low parts of the teeth cause the gap with the sensor to change.

The changing gap causes the magnetic field near the sensor to change.

Due to the changing magnetic field, the voltage from the sensor changes.

ECM receives the signals as shown in the figure.





On Board Diagnosis Logic

[Diagnosis and Repair Workflow] Service and Repair System Diagram [A/T]





DTC Confirmation Procedure

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10.5 V with ignition switch ON.

with SDT

1) Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
2) Check 1st trip DTC.
3) If 1st trip DTC is detected, go to "Diagnosis Procedure".

If 1st trip DTC is not detected, go to next step.
4) Maintaining engine speed at more than 800 rpm for at least 5 seconds.
5) Check 1st trip DTC.
6) If 1st trip DTC is detected, go to "Diagnosis Procedure".

with GST

Follow the procedure "WITH SDT" above.

Diagnosis Procedure

1. CHECK STARTING SYSTEM

Turn ignition switch to START position.






Yes or No
Yes
GO TO 2.
No
Check starting system. (Refer to Initial Inspection and Diagnostic Overview.)

2. CHECK GROUND CONNECTIONS

1 Turn ignition switch OFF.
2 Loosen and retighten two ground screws on the body. Refer to [Power Supply and Ground Circuit Check] Power Supply and Ground Circuit Check.






OK or NG
OK
GO TO 3.
NG
Repair or replace ground connections.

3. CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT

1 Disconnect camshaft position (CMP) sensor (PHASE) harness connector.





2 Turn ignition switch ON.
3 Check voltage between CMP sensor (PHASE) terminal 1 and ground with SDT or tester.











OK or NG
OK
GO TO 5.
NG
GO TO 4.

4. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E2, F32
- Harness for open or short between camshaft position sensor (PHASE) and ECM
- Harness for open or short between camshaft position sensor (PHASE) and IPDM E/R


Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT

1 Turn ignition switch OFF.
2 Check harness continuity between CMP sensor (PHASE) terminal 3 and ground.






3 Also check harness for short to power.

OK or NG
OK
GO TO 7.
NG
GO TO 6.

6. DETECT MALFUNCTIONING PART

Check the following.
- Harness connector E2, F32
- Harness for open or short between CMP sensor (PHASE) and ground.


Repair open circuit or short to power in harness or connectors.

7. CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1 Disconnect ECM harness connector.
2 Check harness continuity between ECM terminal 14 and CMP sensor (PHASE) terminal 2.
Refer to Wiring Diagram.






3 Also check harness for short to ground and short to power.

OK or NG
OK
GO TO 8.
NG
Repair open circuit, short to ground or short to power in harness or connectors.

8. CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to "Component Inspection".

OK or NG
OK
GO TO 9.
NG
Replace camshaft position sensor (PHASE). Refer to [Timing Chain: Exploded View] Exploded View.

9. CHECK CAMSHAFT (INTAKE)

Check the following.





- Accumulation of debris to the signal plate of camshaft rear end
- Chipping signal plate of camshaft rear end

OK or NG
OK
GO TO 10.
NG
Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to [Camshaft: Removal and Installation] Removal and Installation.

10. CHECK INTERMITTENT INCIDENT

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.


INSPECTION END

Component Inspection

Camshaft Position Sensor (PHASE)

1) Loosen the fixing bolt of the sensor.
2) Disconnect camshaft position sensor (PHASE) harness connector.
3) Remove the sensor.
4) Visually check the sensor for chipping.





5) Check resistance as shown in the figure.