Camshaft Position Sensor: Testing and Inspection
CAMSHAFT POSITION (CMP) SENSOR INSPECTIONVisual Inspection
1. Remove the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/ INSTALLATION [BP, BP WITH TC].)
2. Make sure that the CMP sensor is free of any metallic shavings or particles.
- If metallic shavings or particles are found on the sensor, clean them off.
3. Install the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [BP, BP WITH TC].)
Wave Profile Inspection
1. Remove the PCM. (See PCM REMOVAL/INSTALLATION [BP, BP WITH TC].)
2. Connect WDS or equivalent to DLC-2 connector.
3. Connect oscilloscope test leads to the following PCM connector terminals.
- (+)lead:PCM terminal 3V
- (-)lead:PCM terminal 4A
4. Start the engine.
5. Monitor RPM PID.
6. Inspect wave profile when idling engine.
- If wave profile or voltage are out of specifications, carry out the "Circuit Open/Short Inspection".
- PCM terminal: 3V(+) <=> 4A(-)
- Oscilloscope setting: 2.0V/DIV(Y), 20ms/ DIV(X), DC range
- Vehicle condition: Idling
Circuit Open/Short Inspection
1. Remove the PCM. (See PCM REMOVAL/INSTALLATION [BP, BP WITH TC].)
2. Inspect the following wiring harnesses for an open or short circuit by probing the applicable sensor and PCM terminals with ohmmeter leads.
- If there is an open or short circuit, repair or replace wiring harnesses.
- If there is no open or short circuit, replace the CMP sensor.
Open circuit
- CMP signal circuit (CMP sensor connector terminal B and PCM connector terminal 3V)
- Power circuit (CMP sensor connector terminal A and main relay terminal D through common connector)
- GND circuit (CMP sensor connector terminal C and PCM connector terminal 4A)
Short circuit
- CMP signal circuit (CMP sensor connector terminal B and PCM connector terminal 3V to GND)
- Power circuit (CMP sensor connector terminal A and main relay terminal D through common connector to GND)
3. Reconnect the CMP sensor connector.
4. Inspect the protrusion of camshaft (intake side) for damage and cracks.