Page 541 - Foton Workshop Manual - Auman EST-M

Engine section – Engine (Cummins ISF3.8) EG - 25

IN

Failure phenomenon Possible reason Failure elimination
DI
Exhaust system hot air leaking to engine
Check if the exhaust pipeline leaks or the part is broken
cabin
EG
Not correct/too much exhaust braking If applicable, check the exhaust braking operation and

operation cooling fan operation. Refer to manufacturer’s manual
The air temperature TR
in the intake manifold Check the boosting pressure sensor and circuit. Compare
Intake manifold (boost) pressure sensor
is higher than the the intake manifold pressure sensor reading under the
or circuit failed AX
technical monitoring mode

specification
The vehicle cooling system cannot meet Verify if the engine and vehicle cooling system use correct
FR
the requirement parts

The size of fan is not adequate and cannot
Verify if the fan specification is correct ST
be used for this application

Intake or exhaust leaking Check if the intake system and exhaust system leak
BR
Intake system resistance exceeding Check the intake system resistance. If necessary, clean or
technical specification replace the air filter and intake pipe BW
Air-air cooler blocked or leaking Check if the air-air cooler is blocked or leaks

Intake manifold pressure sensor failed Check the intake manifold pressure sensor EL

Fragments in the system or friction
If necessary, replace the turbine booster
Intake manifold between the rotor and housing

(boost) pressure
Air compressor connecting pipe loose or Check the joint between the manifold and air compressor.
lower than normal broken If necessary, repair or replace it
value
Exhaust system resistance not meeting
Check the resistance of exhaust system
specification

The waste gas by-pass valve of turbine Check if the waste gas by-pass valve works well Check if

booster is broken or stuck at On position the waste gas by-pass valve is broken

Check if the turbine booster is broken Measure the gap
Turbine booster worn or broke
between the turbine impeller and compressor impeller

Engine output power low Refer to engine output power low failure diagnosis

EG-025