Page 597 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-451

POSTPROCESSING DIESEL PARTICULATE FILTER -

EXCESSIVELY AUTOMATIC AND / OR FIXED REGENERATION

Fault phenomenon Diagnosis logic Possible reasons

• Poor fuel quality
• Fuel
• Postprocessing DPF 04
• Postprocessing DPF differential pressure sensor
differential pressure sensor
Postprocessing diesel fault
• Fuel system
particulate filter - excessively • Turbocharger • Fuel system fault
automatic and / or fixed • Turbocharger fault
• EGR system
regeneration • EGR system fault
• Postprocessing DOC
• Postprocessing DOC fault
• Postprocessing DPF
• Postprocessing DPF 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 turbocharger

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

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

3 . Check fuel

(a) Check the quality of fuel is accord with standard.
Is the inspection result normal?
YES>To step 4.

NO> Replace fuel.

4 . Check high pressure fuel pump actuator circuit
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Check whether high pressure fuel pump actuator circuit can work properly.

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