Page 479 - Foton Workshop Manual - Auman EST-M

Diagnosis - Mechanical fault diagnosis DI - 425

Failure phenomenon Possible reason Failure elimination IN

Exhaust system resistance not meeting
Check the resistance of exhaust system
specification DI

Fuel grade not meeting the application or
Use well known high quality to run the engine
fuel quality too bad EG
Fuel consumption too much Ceiling mechanism adjustment not correct Measure and adjust the top mechanism
Perform diagnosis to find the failed injector If TR
Injector failed
necessary, replace the injector

Separate the engine oil and check the filter to AX
Engine broken internally
determine the possible broken part

Engine idle time too long Do not run the engine at idle for long time
FR
Fuel return pipe resistance Check if the fuel return pipe is blocked

Injector clamp screw loose Tighten the screw according to the specification ST
Dismount and check the injector. Replace the
Injector O-ring broken or missed
injector O-ring
BR
Perform diagnosis to find the broken injector If
Injector failed
Engine oil mixed with fuel necessary, replace the injector
BW
Dismount the injector and check its gasket
Injector gasket not correct
thickness
EL
Check the output pressure of gear pump. If
Gear pump failure
necessary, replace the gear pump

Separate the engine oil and check the filter to
Engine broken internally
determine the possible broken part

Check the fan drive belt If necessary, replace the
Fan drive belt disconnected
belt

Check the belt tension. Tighten the belt if
Fan drive belt loose
necessary
Air-air cooler radiation fin, radiation fin or
Check the air-air cooler, AC condenser and
AC condenser radiation fin broken or
The air temperature in the radiation fin. If necessary, clean it
blocked by bits
ntake manifold is higher than
Check the intake manifold temperature sensor
the technical specification The air temperature sensor of intake
corresponding to the error code. If necessary,
manifold fails in the working range
replace the sensor

The fan shield is broken or missed, or the Check the shield and deflector. If necessary,

air deflector is broken or missed repair, replace or install it

Speed too low and engine not cooled down Reduce the engine load. Increase the engine (fan)

enough under high load speed by shifting to the low speed control

DI-425