General Precautions of EFI System Maintenance
F-107
S/N Operating Steps Test Result Follow-up Step
8
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
8. Normal start with unstable idling speed after warming up.
General malfunction Locations: 1. Water-containing Fuel; 2. Coolant Temperature Sensor; 3. Spark Plug; 4.
Throttle Body; 5. Air intake passage; 6. Mechanical Part of Engine.
General Diagnostic Flow:
S/N Operating Steps Test Result Follow-up Step
1
Inspect whether or not air filter is blocked, and whether or not
air leakage exists in air intake passage.
Yes
Air intake
system to be
inspected and
repaired
No Next Step
2
Inspect spark plugs of respective cylinders, and observe
whether or not their models and clearances are compliant with
specifications.
Yes Next Step
3
Inspect whether or not carbon accumulation exists on the
throttle body.
Yes To be cleaned
4
Pull off the joint of coolant temperature sensor, start the
engine, and observe whether or not the idling speed of engine
is unstable at this point in the warming-up process.
Yes
Line to be
inspected and
repaired or
sensor to be
replaced
No Next Step
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
No Next Step
6
Inspect the fuel status, and observe whether or not
malfunction symptom is caused just after fuel has been filled.
Yes
Fuel to be
replaced
No Next Step
7
Inspect the pressure situation for respective cylinders of
engine, and observe whether or not considerable difference
exists for the pressure of engine cylinders.
Yes
Mechanical
malfunction of
engine to be
removed
No Next Step
8
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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