General Precautions of EFI System Maintenance
F-105
S/N Operating Steps Test Result Follow-up Step
10
Inspect whether or not the ignition sequence and the ignition
timing of engine is compliant with specifications.
Yes Next Step
No
Ignition timing
to be inspected
and repaired
11
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
6. Normal start with unstable idling speed at any time.
General malfunction Locations: 1. Water-containing Fuel 2. Fuel Injector ; 3. Spark Plug; 4. Throttle Body; 5.
Air intake passage; 6. Ignition Timing; 7. Spark Plug; 8. Mechanical Part of Engine
General Diagnostic Flow:
1
Inspect whether or not air filter is blocked, and whether or not
air leakage exists in air intake passage.
Yes
system to be
inspected and
repaired
2 Inspect whether or not the throttle valve is seized up.
Yes
or replaced
3
Inspect spark plugs of respective cylinders, and observe
whether or not their models and clearances are compliant with
specifications.
No
To be adjusted
or replaced
4
Inspect whether or not carbon accumulation exists on the
throttle body.
5
Demount the fuel injector, and use the special cleaning
analyzer for the fuel injector to examine whether or not
leakage, blockage, or flow rate out of tolerance exists with
fuel injector.
Yes
Fuel injector in
malfunction to
be replaced
6
Inspect the fuel status, and observe whether or not
malfunction symptom is caused just after fuel has been filled.
Yes
replaced
7
Inspect the pressure situations for respective cylinders of
engine, and observe whether or not considerable difference
exists for the pressure of engine cylinders.
Yes
malfunction of
engine to be
removed
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