General Precautions of EFI System Maintenance
F-101
II. Engine rotates but without being started.
General malfunction Locations: 1. Empty Fuel Tank; 2. Fuel Pump; 3. Rotational Speed Sensor; 4. Ignition
Coil; 5. Mechanical Part of Engine.
General Diagnostic Flow:
S/N Operating Steps Test Result Follow-up Step
1
Link up the fuel pressure gauge (the linking point to be on the
front end of the oil inlet pipe for the fuel rail assembly), start
the engine, and examine whether or not the fuel pressure is at
about 400kPa under the idling speed operating condition.
Remove vacuum tube on fuel pressure regulator, verify
whether pressure is about 450kpa.
Yes Next Step
No
Fuel system to
be inspected and
repaired
2
Connect up the diagnostic instrument of the electronic
injection system, and observe the data item of “Engine
Speed”. Start the engine, and observe whether or not there is
output of rotational speed signal.
Yes Next Step
No
Line of
rotational speed
sensor to be
inspected and
repaired
3
Pull out the cylinder connection from one of the cylinders,
link up the spark plug, cause the sparking-plug electrode to be
about 5mm away from the engine body, start the engine, and
examine whether or not there is blue and white high voltage
flame.
Yes Next Step
No
Ignition system
to be inspected
and repaired
4
Inspect the pressure situations of respective engine cylinders,
and observe whether or not pressure deficiency exists with
engine cylinders.
Yes
Mechanical
malfunction of
engine to be
removed
No Next Step
5
Link up the adapter of the electronic injection system, turn on
the ignition switch, and examine whether or not the power
supply for Pins 12#, 63#, 44# and 45# is normal. Inspect
whether or not the grounding of Pins 79#, 17#, 35#, 36#, 51#,
53#, 80# and 61# is normal.
Yes Diagnostic Help
No
Corresponding
lines to be
inspected and
repaired
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