Page 608 - Foton Workshop Manual - Tunland (AT)

04-462 DIAGNOSTICS - ENGINE CONTROL SYSTEM

CRANKCASE GAS (CHANNELING GAS) OVERLOAD

Fault phenomenon Diagnosis logic Possible reasons
• Crankcase ventilation • Crankcase ventilation
system system fault

04 Crankcase gas (channeling • Valve oil seal • Valve oil seal fault
gas) overload • Piston ring • Piston ring fault
• Valve guide pipe • Valve guide pipe fault
• Piston • Piston fault

Diagnosis logic

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 crankcase ventilation system

(a) Check whether crankcase ventilation system has phenomenon of gas channeling.
Is the inspection result normal?

YES >Maintenance related faults.
NO >To step 3.

3 . Check valve oil seal

(a) Check whether the valve oil seal is damaged.
Is the inspection result normal?
YES>To step 4.

No >Maintenance related faults.

4 . Check valve guide pipe
(a) Check whether the valve guide pipe is damaged.

Is the inspection result normal?

YES>To step 5.
No >Maintenance related faults.

5 . Check piston
(a) Check whether piston is damaged or not.

Is the inspection result normal?

Page 608