Page 1028 - Workshop Manual - Tunland (2017)

04-342 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 COOLANT TEMPERATURE IS ABOVE NORMAL - GRADUALLY

OVERHEATED

Fault phenomenon Diagnosis logic Possible reasons

• Engine Accessory Belt • Engine Accessory Belt fault
• Intercooler • Intercooler fault
• Air conditioner condenser • Air conditioner condenser
• Water pump • Water pump fault
• Cooling system • Cooling system fault
• Cooling pipe • Cooling pipe fault
Coolant temperature is above
• Radiator cover • Radiator cover fault
normal - gradually overheated
• Thermostat • Thermostat fault
• Fan • Fan fault
• Coolant temperature sensor • Coolant temperature sensor
• Warm air system fault
• Radiator • 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

(a) Check whether coolant is accord with standard or not.
Is the inspection result normal?

YES>To step 3.
NO >Replace coolant.

3 . 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 4.

No >Maintenance related faults.

4 . Check water pump
(a) Check whether water pump is damaged or not.