Manufacturer Specific Patterns and Waveforms

MEASUREMENT METHOD
1. Connect the analyzer special patterns pickup to camshaft position sensor terminal 2.
2. Disconnect the crankshaft position sensor connector and connect the special tool (test harness: MD998478) in between.
3. Connect the analyzer special patterns pickup to crankshaft position sensor terminal 2.

ALTERNATE METHOD (TEST HARNESS NOT AVAILABLE)
1. Connect the analyzer special patterns pickup to ECM terminal 68. (When checking the camshaft position sensor signal wave pattern
2. Connect the analyzer special patterns pickup to ECM terminal 69. (When checking the crankshaft position sensor signal wave pattern)

STANDARD WAVE PATTERN (Observation Conditions)
Function Special Patterns
Pattern Height Low
Pattern Selector Display
Engine RPM idle




WAVE PATTERN OBSERVATION POINTS (STANDARD WAVE PATTERN)
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
Wave Pattern Characteristics
Abnormality in sensor disk WAVE PATTERN CHARACTERISTICS Wave pattern jumps to the left or right.