Page 2672 - Foton Workshop Manual - Sauvana

62-620 DIAGNOSIS-ENGINE CONTROL SYSTEM

BADACCELERATION,POOR PERFORMANCE

Fault phenomenon Diagnosis logic Possible reasons

• Air fuel ratio control system
fault
• Air intake system • Fuel supply system failure
• Fuel supply system
Badacceleration,poor • Throttle body • Too lowof the compression
pressure
performance • Electronic accelerator pedal • Throttle body default
• Injector • Inject failure
• ECU
• Ignition system failure
• ECU

Diagnosis steps
1. Check the motor data.

(a). Ignition switch: LOCK。
(b). Connect the diagnosis tool with the fault diagnosis connector (16pins) on the lower
left of the dashboard.
(c). Ignition switch: Turn on the ignition switch, and start the diagnostic tool.
(d). Read the motor data shown on the diagnostic tool.

Check whether the data flow is normalor not.
Yes>To step 2.
No> Maintenance related faults.

2. Perform visual and external check

(a). Observe the rotation status and shaking degree of the motor.
(b). At the same time observe the swing amplitude of the motor tachometer pointer, it
lower the speed when turns off.
(c). Observe whether it is normal idle flameout or the load idling flameout.(turn on the air
conditioner, light, hang the gear and turn the steering wheel etc.)
(d). Whether the external parts of the motor are normal or not. Whether the vacuum
tube losses or damages or not; whether the wire connector looses or not.

Is the result normal?
Yes>To step 3.
No> Exclude the problem and confirm that the phenomenon no longer exists.

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