Page 559 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-413

THE COOLANT TEMPERATURE IS BELOW THE NORMAL

Fault phenomenon Diagnosis logic Possible reasons
• Thermostat fault
• Thermostat
• Fan fault
• Fan
The coolant temperature is • Coolant temperature sensor
• Coolant temperature sensor 04
below the normal fault
• Warm air system
• Warm air system fault
• ECM
• ECM 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 coolant temperature sensor

(a) Check whether the coolant temperature sensor can work properly.
Is the inspection result normal?

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

3 . Check the thermostat

(a) Check whether thermostat is damaged or not.
Is the inspection result normal?
YES>To step 4.

NO >Replace thermostat.

4 . Check fan
(a) Check whether the fan can work properly.

Is the inspection result normal?

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

5 . Check warm air system
(a) Check whether the warm air system can work properly.

Page 559