Mitsubishi Lancer Evolution VIII MR Technical Information download pdf (Page 67)

13A-28

MPI – TROUBLESHOOTING

Standard waveform

2 engine revolutions (1 camshaft revolution)

crank angle

sensor output

waveform

exhaust cam

position sensor

output waveform

(cam reset angle)

(cam most advanced angle)

(phase-

angle)

• The intake cam position sensor detects the position of the inlet camshaft. The notch located on the intake side of the

camshaft creates 4 output pulses for each revolution of the camshaft.

• When the time difference between the rise and fall of the output waveform from the crank angle sensor and the rise and fall

of the output waveform from the intake cam position sensor is long the cam is at the reset angle, when the time difference is

short the cam is at the most advanced angle.

Note

When the cam is at the most advanced angle, the rise and fall of the output waveform from the intake cam position sensor

should be at an advancing angle of about 60°.

• As engine revolutions approach 2500r/min, check that the time difference (T) between the rise and fall of the output

waveform from the crank angle sensor, and the rise and fall of the output waveform from the intake cam position sensor, gets

shorter.

• Example 1

Waveform characteristics

A rectangular waveform is produced even though the

engine has not been started.

Cause of the problem

Sensor interface fault

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Mitsubishi Lancer Evolution VIII MR Technical Information Page 67