GDI ± Troubleshooting
13A-86
Standard wave pattern
Crank angle
sensor output
wave pattern
(V)
75_BTDC
2 engine revolutions
(1 camshaft revolution)
5_BTDC
The time (cycle time) T is
reduced when the engine
speed increases
0
Camshaft posi-
tion sensor out-
put wave pat-
tern
TDC: Top dead centre
No. 1
TDC
No. 3 TDC No. 4
TDC
No. 2
TDC
Time
0
T
4
4
Wave Pattern Observation Points
Check that cycle time T becomes shorter when the engine speed increases.
Examples of Abnormal Wave Patterns
D Example 1
Cause of problem
Sensor interface malfunction
Wave pattern characteristics
Rectangular wave pattern is output even when the engine
is not started.
D Example 2
Cause of problem
Loose timing belt
Abnormality in sensor disk
Wave pattern characteristics
Wave pattern is displaced to the left or right.
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