Page 104 - Foton Workshop Manual - Auman EST-M

DI - 50 Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts

Diagnosis procedure
Caution
●Before the following steps are executed, ensure that the connection between the ECM and the
Crankshaft position sensor is well connected.

● Before performing electrical diagnosis and test, refer to the schematic wiring diagram and
components information
● Before measuring, check if the pins of connector are broken, loose or corroded. Make sure the pins in
good contact.
● If well connected, observe the signal voltage of sensor when moving the connector and harness. If any
fault occurs, the indicated voltage of diagnostic unit will be changed.

1. Read DTC of diagnostic unit and signals of crankshaft position sensor.

a. Start the engine and run it to the normal working temperature
b. Use the diagnosis instrument to perform DTC confirmation procedure
c. Use the diagnosis instrument to read the sensor data stream
d. The engine runs at idle

e. Adopt the diagnostic unit to read the waveform of crankshaft position sensor.
Check if the result is ok?
Yes>intermittent failure
NO>go to Step 2.

2. Check the power circuit of crankshaft position sensor.
a. Ignition switch: LOCK.

b. Disconnect the cable of battery negative pole
c. Disconnect the connector A011 of crankshaft position sensor and ECM connector A001 separately

d. Measure the resistance between Pin 1 of Crankshaft
position sensor connector A011 and Pin 13 of ECM
connector A001.
Standard resistance:

Multimeter connection Standard value

A011(1)-A001(13) About 0Ω

Check if the result is ok?
Yes>go to Step 3.

No>check, repair or replace the power harness of crankshaft position sensor.
3. Check the ground circuit of crankshaft position sensor.

a. Ignition switch: LOCK.
b. Disconnect the cable of battery negative pole

c. Disconnect the connector A011 of crankshaft position sensor and ECM connector A001 separately

DI-050