Page 103 - Foton Workshop Manual - Auman EST-M

Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts DI - 49

Crank position sensor failure IN
234-engine crankshaft speed/position-valid but over normal operating range-the highest severity level
689-engine crankshaft speed/position sensor-unstable, intermittent or incorrect data-signal missing of DI
camshaft position sensor

2321-engine crankshaft speed/position-unstable, intermittent or incorrect- intermittent crankshaft EG
engine speed sensor synchronization

Overview
TR
1. The crankshaft position sensor is mainly used to measure the engine speed, and convert the engine speed

signal into an electric signal, which will be transmitted to ECU. ECU will calculate the engine speed as per
AX
this signal, refer to the signal of camshaft position sensor, and judge the stroke position of piston inside the air

cylinder to control its fuel injection time, fuel injector pressure and capacity, etc.
FR
2. Failures of crankshaft position sensor are mainly presented by engine not starting, difficult to start or
shaking at high speed
Circuit diagram ST

BR

BW
Engine ECM
Crankshaft
Sensor + position Sensor +
signal
EL

Red White Black

Crankshaft position sensor

DI-049