MULTIPORT
On-Vehicle Inspection of
FUEL INJECTION Components
TROUBLESHOOTING HINTS
Hint 1: Poor cleaning of exhaust gas will result if the heated oxygen sensor fails.
Hint 2: If the heated oxygen sensor checked good but the sensor output voltage is out of specification,
troubles of parts related to air-fuel raito control system are suspected.
[Examples]
(1) Faulty injector
(2) Air leaking into the intake manifold through gasket gap, etc.
(3) Faulty volume air flow sensor, intake air temperature sensor, barometric pressure sensor, engine
coolant temperature sensor
INSPECTION
Using Scan Tool
oxygen sensor (front)>
Function
Data reading
item No.
Data display
11
39
Sensor
detection
voltage
Check condition
Engine Warm-up
(Make the mixture lean by engine
speed reduction, and rich by racing)
Engine: Warm-up
(Using the heated oxygen sensor
signal, check the air/fuel mixture ra-
tio, and also check the condition of
control by the engine control mod-
ule)
L
<Heated oxygen sensor (rear)>
Function
Item No.
Data display
Check condition
Data reading 59
Sensor
l
Transaxle: 2nd gear
69
voltage
L range
l
Drive with wide open throttle
Engine state
Standard value
When sudden
deceleration
from 4,000 rpm
200
or lower
When engine is
suddenly raced
600 1,000
700 rpm
(Idling)
2,500 rpm
400
or lower
1,000
Engine
condition
3,500 rpm
Standard value
1,000
oxygen sensor (front, rear)>
Function
Item No.
Data display
Check condition
Engine
Normal
condition
indication
Data reading 48
Heater
Engine: Warm-up
750 rpm (Idle)
ON
condition
5,000 rpm
OFF
TSB Revision
Содержание 1992 3000GT
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