Page 503 - Foton Workshop Manual - Tunland (AT)
P. 503
DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-357
Fault phenomenon Possible reasons Refer to
8. Coolant temperature
sensor
9. Cooling system
10. Water pump 04
1. Key switch or key switch Chapter 04 Diagnosis- the
The engine can not stop circuit motor control system, engine
2. ECM can not stop
1. Injector
Chapter 04 Diagnosis- the
In low idle or high idle speed, 2. Fuel system motor control system, in low
the engine is unstable idling 3. Intake system idle or high idle speed, the
engine is unstable idling
4. ECM
1. Accelerator pedal
2. Injector Chapter 04 Diagnosis- the
The engine decelerates
3. ECM motor control system, engine
slowly
4. Gearbox decelerates slowly
5. Electronic throttle valve
1. Engine accessory belt
2. Injector
3. Crankshaft or main bearing
4. Connecting rod bearing
5. Turbocharger
6. Overhead mechanism
7. Piston or piston ring
Chapter 04 Diagnosis- the
8. Timing chain
Excessive engine noise motor control system,
9. Idler wheel or tensioner excessive engine noise
wheel
10. Connecting rod
11. Burning knock
12. Injection timing
13. Piston pin
14. Engine oil
15. Intake and exhaust pipe
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