Page 1035 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-349

THE ENGINE DECELERATES SLOWLY 04

Fault phenomenon Diagnosis logic Possible reasons
• Electronic throttle valve • Electronic throttle fault
• Accelerator pedal • Accelerator pedal fault
• Clutch • Clutch fault
The engine decelerates
• Injector • Injector fault
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 clutch

(a) Check whether the clutch has phenomenon of incomplete separation.
Is the inspection result normal?

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

4 . Check the electronic throttle
(a) Check whether the electronic throttle work abnormally.

Is the inspection result normal?

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

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