Page 1098 - Workshop Manual - Tunland (2017)

04-412 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 INTAKE MANIFOLD AIR TEMPERATURE IS HIGHER THAN

TECHNICAL SPECIFICATION VALUE

Fault phenomenon Diagnosis logic Possible reasons

• Turbocharger system • Turbocharger system fault
• EGR system • EGR system fault
• Intake manifold (boost) • Intake manifold (boost)
pressure sensor pressure sensor fault
Intake manifold air
• Exhaust system • Exhaust system fault
temperature is higher than
• Radiator • Radiator fault
technical specification value
• Cooling system • Cooling system fault
• Fan • Fan fault
• Intake heater • Intake heater 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 the intake heater

(a) Check whether the intake heater can work properly.
Is the inspection result normal?

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

3 . No >Maintenance related faults.
(a) Check whether turbocharger can work properly.
(b) Check whether outside intercooler is blocked or not.
Is the inspection result normal?

YES>To step 4.
No >Maintenance related faults.

4 . Check the exhaust system
(a) Check whether exhaust system leaks.

Is the inspection result normal?