Page 137 - Foton Workshop Manual - Auman EST-M

Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts DI - 83

Cold start difficult and vehicle shaking IN
Failure phenomenon list

Failure phenomenon Possible reason Failure elimination DI

1. Fuel quality poor ● Replace fuel
EG
2. Pre-heating circuit (no sufficient ● Check if the pre-heater circuit is ok

pre-heating) Check if the preheater resistance is ok
TR
● Check whether the inlet manifold

temperature pressure sensor and its
AX
connector and conductor are perfect.

● Check whether the atmospheric
FR
3. Improper mixing ratio pressure sensor, its connector and

conductor are perfect.
ST
Cold start difficult and vehicle shaking ● Check the crankshaft/camshaft
position sensor

● Check the coolant temperature sensor BR

● Check if the injector drive circuit
BW
(including the connector) is open/short

● Check if the high pressure oil pipe
4. Injector failure
leaks EL
● Check if the injector is broken or there
is carbon deposit.

5. ECM failure ● Replace ECM

Diagnosis procedure
1. Check the fuel

a. Check if there is water or impurities in the fuel.
Check if the result is ok?

Yes>go to Step 2.
NO>replace the fuel and clean the fuel tank.

2. Check the battery

a. Check the battery voltage.

Standard voltage:

Multimeter connection Standard value

Battery positive and negative poles About 24V
Check if the result is ok?

Yes>go to Step 3.
NO>charge the battery or replace it.

DI-083