Page 2643 - Foton Workshop Manual - Sauvana

DIAGNOSIS-ENGINE CONTROL SYSTEM 62-591
THE STARTER ROTATES BUT THE MOTORCAN’T START

Fault phenomenon Diagnosis logic Possible reasons

• Poor fuel qualityy
• Leakage in the gas intake
system 62
• Spark plug • Low fuel pressure
• Inlet system • Block in the air filter
• Fuel temperature • Water temp sensor fault
The starter rotates but • Coolant temperature sensor • Air flow meter failure
the motorcan’t start • Air flowmeter • Failure of idling control valve
• Fuel injector • Injector does not work when
• Ignition timing cold starts
• The fuel quality • Leakage of the injector
• Ignition timing wrong
• Too low of t he cylinder
compression pressure

Diagnosis Procedure
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. Check the secondary ignition system

(a). Unplug the fuel injector fuse.
(b). Remove the high voltage wire and the spark plug.
(c). Connect the spark plug with the high voltage wire and connect the spark plug
negative to the cylinder block.
(d). Start the motor to test the secondary ignition system.

Is the inspection result normal?

YES>To step 4。
No >To step 3。

Page 2643