Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1255

13A-118
Standard Wave Pattern
Observation condition
Function
Pattern height
Pattern selector
Engine r/min
Standard Wave Pattern
(V)
Crank angle
sensor output
wave pattern
Camshaft position
sensor output
wave pattern
TDC: Top dead centre
Wave Pattern Observation Points
Check that cycle time T becomes shorter when the engine speed increases.
MPI -
2 engine revolutions
(1 camshaft revolution)
75_BTDC
5_BTDC
0
131_ 49_
0
No. 1 TDC No. 3 TDC
Examples of Abnormal Wave Patterns
D
Troubleshooting
Special patterns
Low
Display
Idle speed
56_ 34_
No. 4 TDC No. 2 TDC
Example 1
Cause of problem
Sensor interface malfunction
Wave pattern characteristics
Rectangular wave pattern is output even when the engine
is not started.
The time (cycle time) T is
reduced when the engine
speed increases
Time