MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-658
32
53
Variable induction
control solenoid
Engine: idling
1 V or less
Engine: 5,000 r/min
B+
51
55
Barometric
pressure sensor
Ignition switch:
"ON"
When altitude is 0 m (0 ft)
3.7
−
4.3 V
When altitude is 600 m
(1,969 ft)
3.4
−
4.0 V
When altitude is 1,200 m
(3,937 ft)
3.2
−
3.8 V
When altitude is 1,800 m
(5,906 ft)
2.9
−
3.5 V
50
56
Camshaft position
sensor
Engine: cranking
0.4
−
3.0 V
Engine: idling
0.5
−
2.0 V
68
58
Ignition switch-ST
Engine: cranking
8 V or more
65
61
A/C switch 2
•
Engine: idling
•
Outside air
temperature:
25
°
C or more
When A/C is maximum
cooling condition (when the
load by A/C is high)
B+
When A/C is maximum
heating condition (when the
load by A/C is low)
1 V or less
62
64
Intake air
temperature
sensor
Ignition switch:
"ON"
When Intake air temperature
is
−
20
°
C (
−
4
°
F)
3.8
−
4.4 V
When Intake air temperature
is 0
°
C (32
°
F)
3.2
−
3.8 V
When Intake air temperature
is 20
°
C (68
°
F)
2.3
−
2.9 V
When Intake air temperature
is 40
°
C (104
°
F)
1.5
−
2.1 V
When Intake air temperature
is 60
°
C (140
°
F)
0.8
−
1.4 V
When Intake air temperature
is 80
°
C (176
°
F)
0.4
−
1.0 V
61
65
Volume air flow
sensor
Engine: idling
2.2
−
3.2 V
Engine: 2,500 r/min
60
66
Backup power
supply
Ignition switch: "LOCK" (OFF)
B+
71
71
Left bank heated
oxygen sensor
(front)
•
Engine: warming up, 2,500 r/min (check using
a digital voltmeter)
0
⇔
0.8 V
(changes
repeatedly)
72
72
Right bank heated
oxygen sensor
(front)
•
Engine: warming up, 2,500 r/min (check using
a digital voltmeter)
0
⇔
0.8 V
(changes
repeatedly)
73
73
Left bank heated
oxygen sensor
(rear)
•
Engine: warming up
•
Revving
0 and 0.6
−
1.0 V
alternates
TERMINAL
NO. <M/T>
TERMINAL
NO. <A/T>
INSPECTION ITEM
INSPECTION CONDITION (ENGINE CONDITION)
NORMAL CONDITION
