Page 150 - Foton Workshop Manual - Auman EST-M

DI - 96 Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts

Poor acceleration and bad performance
Failure phenomenon list

Failure phenomenon Possible reason Failure elimination
● Check the rotation of fan or other
accessories for blockage.
1. Overhigh load
Check the oil
● Check the exhaust brake.
● Check the air filter and intake pipeline
● Check the intake manifold pressure
sensor
2. Air intake system failure
● Check the crankshaft/camshaft
position sensor
● Check the coolant temperature sensor
● Check if the high pressure oil pump
supplies sufficient oil rail pressure
● Check if the oil metering cell is
Poor acceleration and bad performance
broken
of engine
3. Oil supply system failure ● Check if the low pressure oil-way
supplies smoothly, injector is stuck, high
pressure oil pipe cracks, etc.
● Check if the fuel pressure sensor is
broken
● Check if the injector drive circuit
(including the connector) is open/short
● Check if the high pressure oil pipe
4. Injector failure
leaks
● Check if the injector is broken or there
is carbon deposit.
5. Accelerator pedal sensor failure ● Check the accelerator pedal sensor
6. ECM failure ● Replace ECM
Diagnosis procedure
1. Check the engine oil

a. Check if the engine oil meets the requirement.
b. Check the quality of engine oil, and check whether the oil contains impurities.
Check if the result is ok?
Yes>go to Step 2.

NO>replace with the specified engine oil.
2. Check the engine air intake system

a. Check if the intake pipe is broken and if the connection leaks.
b. Check if the air filter is clean, not blocked and free of foreign matters.

c. Check if the intake manifold pressure sensor is ok (refer to Chapter DI diagnosis- engine electronic control
fault diagnosis–intake manifold pressure/temperature sensor failure)

DI-096