P0340
P0340, P0345 CMP SENSOR
Description
The camshaft position (CMP) sensor senses the retraction of camshaft (INT) to identify a particular cylinder. The camshaft position sensor senses the piston position.
When the crankshaft position sensor system becomes inoperative, the camshaft position sensor 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 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. 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 P0340.
NO - GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-I
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 P0340.
NO - INSPECTION END
Wiring Diagram
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. ( Description and Operation.)
2.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections M16, M70. Power Supply and Ground Circuit.
Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace ground connections.
3.CHECK CAMSHAFT POSITION (CMP) SENSOR POWER SUPPLY CIRCUIT-I
1. Disconnect CMP sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between CMP sensor harness connector and ground.
Is the inspection result normal?
YES - GO TO 9.
NO-1 - P0340: Repair open circuit, short to ground or short to power in harness or connectors.
NO-2 - P0345: GO TO 4.
4.CHECK CMP SENSOR POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between CMP sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES - GO TO 5.
NO - Repair open circuit.
5.CHECK CMP SENSOR POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES - GO TO 6.
NO - Repair short to ground or short to power in harness or connectors.
6.CHECK COMPONENTS
Check the following.
- CKP sensor ( P0335.)
- EVT control position sensor (bank 2) ( P1078.)
- Battery current sensor ( P1550.)
- EVAP control system pressure sensor ( P0451.)
- Refrigerant pressure sensor ( Magnet Clutch Circuit.)
Is the inspection result normal?
YES - GO TO 7.
NO - Replace malfunctioning component.
7.CHECK APP SENSOR
P2122.
Is the inspection result normal?
YES - GO TO 13.
NO - GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Go to P2122.
- INSPECTION END
9.CHECK CMP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between CMP sensor 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 10.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK CMP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between CMP sensor 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 11.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
11.CHECK CMP SENSOR
P0340.
Is the inspection result normal?
YES - GO TO 12.
NO - Replace malfunctioning camshaft position sensor.
12.CHECK CAMSHAFT (INT)
Check the following.
- Accumulation of debris to the signal plate of camshaft rear end
- Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES - GO TO 13.
NO - Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
13.CHECK INTERMITTENT INCIDENT
Description.
- INSPECTION END
Component Inspection
1.CHECK CAMSHAFT POSITION SENSOR-I
1. Turn ignition switch OFF.
2. Loosen the fixing bolt of the sensor.
3. Disconnect camshaft position sensor 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.
2.CHECK CAMSHAFT POSITION SENSOR-II
Check resistance camshaft position sensor terminals as per the following.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace malfunctioning camshaft position sensor.