Camshaft Position Sensor: Testing and Inspection

MEASUREMENT METHOD
1. Disconnect the distributor connector and connect the special tool (test harness: MB991348) in between. (All terminals should be connected.)
2. Connect the analyzer special patterns pickup to distributor connector terminal No.4. (When checking the camshaft position sensor signal wave pattern)
3. Connect the analyzer special patterns pickup to distributor connector terminal No.3. (When inspecting the crankshaft position sensor signal wave pattern.)

ALTERNATE METHOD (TEST HARNESS NOT AVAILABLE)
1. Connect the analyzer special patterns pickup to ECM terminal No. 68 (When inspecting the camshaft position sensor signal wave pattern.)
2. Connect the analyzer special patterns pickup to ECM terminal No. 69 (When inspecting the crankshaft position sensor signal wave pattern.)





WAVE PATTERN OBSERVATION POINTS
Check to be sure that cycle time T becomes shorter when the engine speed increases.




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 disk
Wave pattern characteristics
Wave pattern jumps to the left or right