General Precautions of EFI System Maintenance
F-108
9. Normal start with unstable idling speed or flameout when partly loaded (i.e. with A/C operating).
General malfunction Locations: 1. Air Conditioning System; 2. Fuel Injector.
General Diagnostic Flow:
S/N Operating Steps Test Result Follow-up Step
1
Inspect whether or not carbon accumulation exists on the
throttle body.
Yes
Related parts
and components
to be cleaned
No Next Step
2
Observe whether or not the output power of engine is
increased when air conditioner is started, namely make use of
the diagnostic instrument of the electronic injection system to
observe the changes in ignition angle of advance, the pulse
width of fuel injection, and the intake volume.
Yes Turn to step 4
No Next Step
3
Connect up the adapter of electronic injection system, open
the connecting line of Pin 69# in electronic control unit, and
examine whether or not it is the up level signal at the end of
wire harness, when air conditioner is turned on.
Yes Next Step
No
Air conditioning
system to be
inspected and
repaired
4
Inspect whether or not the pressure of air conditioning
system, the electromagnetic clutch of compressor, and the
compression pump of air conditioner are under normal
conditions.
Yes Next Step
No
Air conditioning
system to be
inspected and
repaired
5
Demount the fuel injector, and use the special cleaning
analyzer for 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
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
To Next Page
