Page 1086 - Workshop Manual - Tunland (2017)

04-400 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 EXCESSIVE FUEL CONSUMPTION

Fault phenomenon Diagnosis logic Possible reasons
• Poor oil quality and long
• Engine oil maintenance period
• Odometer • Odometer fault
• Vehicle speed sensor • Vehicle speed sensor fault
• Postprocessing system • Postprocessing system
• Electronic throttle valve fault
• Fuel system • Electronic throttle fault
• Intake system • Fuel system fault
Excessive fuel consumption • Exhaust system • Intake system fault
• Turbocharger system • Exhaust system fault
• Injector • Turbocharger system fault
• Exhaust system • Injector fault
• Intake manifold pressure • Exhaust system fault
temperature sensor • Intake manifold pressure
• EGR system temperature sensor fault
• ECM • EGR system fault
• 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 engine oil

(a) Check the quality of engine oil is accord with standard.
Is the inspection result normal?
YES>To step 3.

NO>Replace engine oil.

3 . Check oil maintenance period
(a) Check whether engine oil maintenance period is accord with the standard.

Is the inspection result normal?

YES>To step 4.
NO>Replace engine oil.