Page 636 - Foton Workshop Manual - Tunland (AT)

04-490 DIAGNOSTICS - ENGINE CONTROL SYSTEM

BLACK SMOKE - PLENTY

Fault phenomenon Diagnosis logic Possible reasons
• Intake system • Intake system fault
• Intake manifold pressure • Intake manifold pressure
temperature sensor temperature sensor fault
04
• Fuel system • Fuel system fault
• Turbocharger • Turbocharger fault
Black smoke - plenty
• Crankcase ventilation • Crankcase ventilation
system system fault
• Injector • Injector fault
• Postprocessing DPF • Postprocessing DPF fault
• EGR system • EGR system 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 system
(a) Check whether air filter is blocked.
(b) Check whether pipe of the intake system leaks.
(c) Check whether turbocharger can work properly.
(d) Check whether intercooler leaks.

Is the inspection result normal?
YES>To step 3.
No >Maintenance related faults.

3 . Check the intake manifold pressure temperature sensor
(a) Check whether the intake manifold pressure temperature sensor is installed correctly.
(b) Remove the intake manifold pressure temperature sensor.
(c) Check whether the sensing hole is blocked or not, and whether the resistance between
the terminals is in line with the standard or not.
(d) Check whether the intake manifold pressure temperature sensor is dirty.
(e) Ignition switch: ON, and read the data flow of the intake manifold pressure temperature
sensor shown on the diagnostic tool.

Is the inspection result normal?

Page 636