Camshaft Position Sensor: Testing and Inspection

CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L3]

Visual Inspection

1. Remove the battery cover.

2. Disconnect the negative battery cable.

3. Remove the plug hole plate. Service and Repair

4. Disconnect the CMP sensor connector.

5. Remove the CMP sensor.

6. Verify that there are no metal shavings on the CMP sensor.

- If there is a malfunction, replace the CMP sensor.

Voltage Inspection

1. Idle the engine.

CAUTION:
- Water penetrating the connector will cause sensor malfunction. To prevent this, be careful not to damage the wiring harnesses or the waterproof connector so as to cause water penetration.

2. Measure the output voltage using a oscilloscope.






- If not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection", and repair or replace the malfunctioning part.

CMP sensor voltage





*
Output voltage varies with camshaft rotation.

Circuit Open/Short Inspection





1. Disconnect the PCM connector.

2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

Open circuit

- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.

- CMP sensor terminal A and PCM terminal body ground
- CMP sensor terminal B and PCM terminal 2S
- CMP sensor terminal C and PCM terminal 2AM

Short circuit

- If there is continuity, there is a short circuit. Repair or replace the wiring harness.

- CMP sensor terminal A and power supply
- CMP sensor terminal B and power supply
- CMP sensor terminal B and body ground
- CMP sensor terminal C and body ground