111
Fig.171
Speed/ TDC sensor
Check if the sensor is located in the twentieth tooth after the breach in the flywheel signal panel
1— Speed/ TDC sensor (crankshaft position sensor)
2— Pulley
3— TDC reference point on the pulley
4— TDC reference point on the timing gear cover
5— synchronous tooth
Check the air gap between the sensor and flywheel
：
Magnetic thickness gauge is used for checking the air gap between the sensor and flywheel.
Measurement should be made at least at three different teeth with a equal interval of 120
°
. The value
should be 2
±
0.6mm.
A. Speed sensor signal B.ECU power signal
C.
Current circle for primary coil circuit
a.
Ignition advance angle relative to cylinder 1 TDC
4.3
absolute pressure sensor
The sensing element of absolute pressure sensor is printed in a ceramic membrane by the wheatstone
bridge silk PCB. One side of the membrane is absolute reference vacuum and the other side is actual
vacuum of the intake manifold. The signal (piezoresistance type) produced by the distortion of ceramic
membrane which is installed in the bracket is magnified by the circuit located in the carrier before being
transferred to ECU.
