Page 536 - Foton Workshop Manual - Tunland (AT)

04-390 DIAGNOSTICS - ENGINE CONTROL SYSTEM

SLOW, DULL AND IMBALANCED OF THE ACCELERATING

REACTION

Fault phenomenon Diagnosis logic Possible reasons

• Injector fault
04 • Leakage in the intake
system
• Low fuel pressure
• Injector • Air filter blocked
• Intake system • Electronic throttle fault
• Fuel system • Block in fuel filter
Slow, dull and imbalanced of • Injection timing • Incorrect injection timing
the accelerating reaction
• Electronic throttle valve • Air fuel ratio control system
• Exhaust system fault
• ECM • Fuel supply system fault
• Too low of the compression
pressure
• Exhaust system blocked
• 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 system
(a) Check the air intake pipe joints, gaskets, and the EGR system, fuel steam system.
(b) Check whether the air filter has the filter elements blocked or not.

Is the inspection result normal?
YES>To step 3.
No >Clean and change the default parts.

3 . Check the idle speed
(a) Check whether the idle motion of the motor is normal or not.

Is the inspection result normal?
YES>To step 4.

Page 536