P0340

P0340, P0345 CMP SENSOR (PHASE)

Description






The camshaft position sensor (PHASE) senses the retraction of camshaft (INT) 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.







DTC Logic


DTC DETECTION LOGIC

NOTE:
If DTC P0340 or P0345 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to "DTC Logic" P0643.






DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V with ignition switch ON.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE-I

1.Start engine and let it idle for at least 5 seconds.
If engine does not start, crank engine for at least 2 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure" .
NO- GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE-II

1.Maintaining engine speed at more than 800 rpm for at least 5 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK STARTING SYSTEM

Turn ignition switch to START position.
Does the engine turn over? Does the starter motor operate?
YES- GO TO 2.
NO- Check starting system. (Refer to "Work Flow" Work Flow.)

2. CHECK GROUND CONNECTION

1.Turn ignition switch OFF.
2.Check ground connection M95. Refer to Ground Inspection in "Circuit Inspection" Circuit Inspection.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace ground connection.

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 the voltage between CMP sensor (PHASE) harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.

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

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between CMP sensor (PHASE) harness connector and ECM harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

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

1.Check the continuity between CMP sensor (PHASE) harness connector and ECM harness connector.





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace error-detected parts.

6. CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 7.
NO- Replace malfunctioning camshaft position sensor (PHASE). Refer to "Exploded View" Exploded View.

7. CHECK CAMSHAFT (INTAKE)

Check the following.





- Accumulation of debris to the signal plate of camshaft front end
- Chipping signal plate of camshaft front end
Is the inspection result normal?
YES- GO TO 8.
NO- Remove debris and clean the signal plate of camshaft front end or replace camshaft. Refer to "Exploded View" Exploded View.

8. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
- INSPECTION END


Component Inspection


1. CHECK CAMSHAFT POSITION SENSOR (PHASE)-I

1.Turn ignition switch OFF.
2.Loosen the fixing bolt of the sensor.
3.Disconnect camshaft position sensor (PHASE) harness connector.
4.Remove the sensor.





5.Visually check the sensor for chipping.
Is the inspection result normal?
YES- GO TO 2.
NO- Replace malfunctioning camshaft position sensor (PHASE). Refer to "Exploded View" Exploded View.

2. CHECK CAMSHAFT POSITION SENSOR (PHASE)-II

Check resistance camshaft position sensor (PHASE) terminals as follows.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace malfunctioning camshaft position sensor (PHASE). Refer to "Exploded View" Exploded View.