Page 480 - Foton Workshop Manual - Auman EST-M

DI - 426 Diagnosis - Mechanical fault diagnosis

Failure phenomenon Possible reason Failure elimination

Exhaust system hot air leaking to engine Check if the exhaust pipeline leaks or the part is
cabin broken

If applicable, check the exhaust braking operation
Not correct/too much exhaust braking
and cooling fan operation. Refer to
operation
manufacturer’s manual
The air temperature in the
Check the boosting pressure sensor and circuit.
ntake manifold is higher than Intake manifold (boost) pressure sensor
Compare the intake manifold pressure sensor
the technical specification or circuit failed
reading under the monitoring mode

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

The size of fan is not adequate and cannot
Verify if the fan specification is correct
be used for this application
Check if the intake system and exhaust system
Intake or exhaust leaking
leak

Intake system resistance exceeding Check the intake system resistance. If necessary,
technical specification clean or replace the air filter and intake pipe

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
Fragments in the system or friction beween
If necessary, repair or replace the turbine booster
the rotor and housing

Intake manifold (boost)
Air compressor connecting pipe loose or Check the joint between the manifold and air
pressure lower than normal broken compressor. 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
booster is broken or stuck at On position Check if the waste gas by-pass valve is broken
Check if the turbine booster is broken Measure
Turbine booster worn or broke the gap between the turbine impeller and
compressor impeller

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

DI-426