Page 144 - Foton Workshop Manual - Auman EST-M

DI - 90 Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts

The engine shuts down when it is at cold idle
Failure phenomenon list

Failure phenomenon Possible reason Failure elimination
● Check the air filter and intake pipeline
● Check the intake manifold pressure
sensor
1. 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
broken
The engine shuts down when it is at cold 2. Oil supply system failure ● Check if the low pressure oil-way
idle 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
3. Injector failure
leaks
● Check if the injector is broken or there
is carbon deposit.
4. ECM failure ● Replace ECM
Diagnosis procedure
1. 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)
Check if the result is ok?
Yes>go to Step 2.
NO> check and repair relevant failure.

2. Check the oil supply system of generator
a. Check if the high pressure pump leaks or is stuck.

b. Check if the oil pipe is broke and if the joint is secured and reliable.
c. Check if the oil metering cell and harness are ok.
d. Check the fuel pressure sensor (refer to Chapter DI diagnosis- engine electronic control fault diagnosis–fuel
pressure sensor failure)
Check if the result is ok?

Yes>go to Step 3.

DI-090