Page 571 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-425

THE ENGINE DECELERATES SLOWLY

Fault phenomenon Diagnosis logic Possible reasons
• Electronic throttle valve • Electronic throttle fault
• Accelerator pedal • Accelerator pedal fault
The engine decelerates • Injector • Injector fault 04
slowly • Gearshift mechanism • Gearshift mechanism
• Gearbox • Gearbox 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 accelerator pedal

(a) Check whether the accelerator pedal is stuck.
Is the inspection result normal?

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

3 . Check the electronic throttle
(a) Check whether the electronic throttle work abnormally.
Is the inspection result normal?

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

4 . Check gearshift mechanism
(a) Check whether the gear shifting mechanism is stuck or incompletely separated.

Is the inspection result normal?

YES>To step 5.
No >Maintenance related faults.

5 . Check the fuel injector

(a) Unplug the injector connector.
(b) Remove the fuel distribution pipes and injector outside the engine together.

Page 571