Page 573 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-427

EXCESSIVE ENGINE NOISE

Fault phenomenon Diagnosis logic Possible reasons
• Poor engine oil quality
• Engine oil • Poor fuel quality
• Fuel • Engine Accessory Belt fault 04
• Engine Accessory Belt • Injector fault
• Injector • Crankshaft or main bearing
• Crankshaft or main bearing fault
• Connecting rod or • Connecting rod or
connecting rod bearing connecting rod bearing fault
• Turbocharger • Turbocharger fault
Excessive engine noise • Overhead mechanism • Overhead mechanism fault
• Piston or piston ring • Piston or piston ring fault
• Timing chain • Timing chain fault
• Idler wheel or tensioner • Idler wheel or tensioner
wheel wheel fault
• Burning knock • Burning knock fault
• Injection timing • Injection timing fault
• Piston pin • Piston pin fault
• Intake and exhaust Pipe • Intake and exhaust pipe
fault

Diagnosis Procedure

1 . Check the engine data
(a) Ignition switch: OFF.
(b) Connect the diagnosis tool with the fault diagnosis connector (16 pins) on the lower
left of the dashboard.
(c) Ignition switch: ON, and start the diagnostic tool.
(d) Read the motor data shown on the diagnostic tool.

Check whether the data flow is normal or not.
YES>To step 2.

No >Maintenance related faults.

2 . Check the engine accessory belt.
(a) Check whether the engine accessory belt is aging, cracked and damaged.

Is the inspection result normal?
YES>To step 3.

No >Maintenance related faults.

3 . Check turbocharger
(a) Check whether turbocharger can work properly.

Is the inspection result normal?

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