Service manual

G420F(FE) Service Manual Chapter 5. Engine Management System (EMS) 192
Crank Shaft Position Sensor
Component Location
Description
The Crankshaft Position Sensor (CKPS) is a hall
effect type sensor that generates voltage using a
sensor and a target wheel mounted on the
crankshaft; there are 58 slots in the target wheel
where one is longer than the others.
When the slot in the wheel aligns with the sensor,
the sensor voltage out put slow.
When the metal (tooth) in the wheel aligns with the
sensor, the sensor voltage out puts high.
During one crankshaft rotation there are 58
rectangular signals and one longer signal. The ECM
calculates engine RPM by using the sensor’ signal
and controls the injection duration and the ignition
timing. Using the signal differences caused by the
longer slot, the ECM identifies which cylinder is at
top dead center.
Schematic Diagram
[CIRCUIT DIAGRAM]
[HARNESS CONNECTORS]
ECM
C13
CKPS
B1 - GND
CKPS
3
2
B5 - CKPS
SIGNAL
After Main Relay
A23_DRVP
1
123
Sensor Inspection
123
1. Turn ignition switch to OFF position and then
disconnect CKPS connector.
2. Remove the CKPS from the engine.
3. Turn ignition switch to ON position.
4. Apply battery voltage to the terminal 1 and ground
terminal 1 and ground terminal 3 of CKPS as
shown in the figure.
5. Install a LED between +5V power and CKPS
terminal 2, and then set a steel wheel (or anything
made of steel ; hammer, wrench, bolt and nut etc.)
at the CKPS's tip.
6. Rotate the steel wheel slowly and check if the
LED flashes light.
• If the LED blinks, the CKPS works normally.