Page 374 - Foton Workshop Manual - Auman EST-M
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DI - 320 Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts
Diagnosis procedure
Warning
Any instable operation of engine will result in the pointer jump of tachometer.
1. Check the tachometer signal.
a. Ignition switch: ON.
b. Start the engine, operate the engine at idle speed or step down the accelerator pedal, check whether the
tachometer works normally.
Caution
The instrument tachometer signal is provided by crankshaft position sensor.
Check if the result is ok?
Yes>go to Step 2.
No > refer to "Chapter DI Engine electric control fault diagnosis--crankshaft position sensor fault".
2. Check the combination switch
Caution
If the combination instrument is broken, normally non-professional personnel cannot check and repair
precisely. At present often using the substitution judgment method for service.
a. Replace with a new or normal combination instrument.
b. Connect the circuit, restart the ignition switch and check if the failure is fixed.
Caution
The combination instrument for replacement must be the same specification as previously used.
Is the test result ok?
Yes>repair or replace the combination instrument.
Caution
Internal combination instrument service needs professional personnel. Others shall not dismount
anything.
NO>retest the above steps.
DI-320
