13-14
FUEL SYSTEM
Troubleshooting
output
preference
order
Diannosis item
Diagnosis code
I
Output signal pattern
No.
36
39
Ignition timing
adjustment signal
H
L
Oxygen sensor
(Turbo: Front bank)
Retained
l
Harness and connector
l
Oxygen sensor
l
Fuel pressure
l
Injectors (Replace
if defective)
l
Intake air leaks
Retained
l
Harness and connector
l
Injector coil resistance
Injector
EGR
<California>
41
Retained
l
Harness and connector
l
EGR thermo-sensor
l
l
EGR control solenoid
valve
l
EGR valve control
vacuum
Retained
l
Harness and connector
l
Ignition coil
l
Power transistor unit
lqnition coil,
52
transistor unit
2-5 cylinder)
H
L
coil.
Retained
l
Harness and connector
l
Ignition coil
l
Power transistor unit
Retained
l
Harness and connector
(If harness and connector
are normal, replace only
transaxle control unit.)
Retained
l
Harness and connector
(If harness, connector
and induction control
valve are normal,
replace air intake
plenum assembly.)
transistor unit
H
‘N
O
. 3-6 cylinder)
L
cable from trans-
axle control unit,
H
for transmission
of torque reduction
L
signal
Induction control
valve position
61
62
sensor
H
Turbo>
L
Normal state
H
NOTE
Replace the engine control unit if a malfunction code is output although the inspection reveals that there is no problem with the check
items.
TSB Revision
Summary of Contents for 3000GT 1991
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