Page 2668 - Foton Workshop Manual - Sauvana

62-616 DIAGNOSIS-ENGINE CONTROL SYSTEM

SLOW, DULL AND IMBALANCED OF THE ACCELERATING

REACTION

Fault phenomenon Diagnosis logic Possible reasons

• Air fuel ratio control system
fault
• Air intake system • Fuel supply system failure
• Fuel supply system
Slo w ,du ll a nd • Throttle body • Too lowof the compression
imbalanced of the • Electronic accelerator pedal pressure
accelerating reaction • 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:ON, 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. Check the air intake system

(a). Check the air intake pipe joints, gaskets, vacuum hose and the fuel steam system.
(b). Check whether the air filter has the filter elements blocked or not.

Is the 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 result normal?
Yes> To step 4.
No> Refer to the engine phenomenon diagnostic list -Idle troubleshooting to confirm that
the problem no longer exists.

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