Camshaft Position Sensor: Testing and Inspection

Required Special Tools:
MB991348: Test Harness
MD998478: Test Harness

Measurement Method




1. Disconnect the camshaft position sensor connector, and connect the test harness special tool (MB991348) in between. (All terminals should be connected.)
2. Connect the analyzer special patterns pickup to camshaft position sensor connector terminal 2.
3. Disconnect the crankshaft position sensor connector, and connect the test harness special tool (MD998478) in between.
4. Connect the analyzer special patterns pickup to crankshaft position sensor connector terminal 2 (black clip of special tool).

Alternate method (Test harness not available)
1. Connect the analyzer special patterns pickup to PCM terminal 56. (Check the camshaft position sensor signal wave pattern.)
2. Connect the analyzer special patterns pickup to PCM terminal 45. (Check the camshaft position sensor signal wave pattern.)

Standard Wave Pattern




Observation conditions

Standard Wave Pattern:

Standard Wave Pattern

Wave Pattern Observation Points
1. Check that cycle time T becomes shorter when the engine speed increased.

Examples of Abnormal Wave Patterns




Example 1
- Cause of problem
Sensor interface malfunction.

- Wave pattern characteristics
Rectangular wave pattern is output even when the engine is not started.




Example 2
- Cause of problem
Loose timing belt.
Abnormality in sensor disc.

- Wave pattern characteristics
Wave pattern is displaced to the left or right.