Toyota 1RZ Supplement Manual page 259

CLICK HERE TO VIEW CHAPTER INDEX
Neutral Start Switch Circuit (3RZ- -FE).
CIRCUIT DESCRIPTION
The neutral start switch goes on when the shift lever is in the N or P shift position. When it goes on terminal
NSW of the engine ECU is grounded to body ground via the starter relay thus the terminal NSW voltage be-
comes 0V. When the shift lever is in the D, 2, L or R position, the neutral start switch goes off, so the voltage
of engine ECU terminal NSW becomes battery voltage, the voltage of the engine ECU internal power source.
If the shift lever is moved from the N position to the D position, this signal is used for air--fuel ratio correction
and for idle speed control (estimated control), etc.
WIRING DIAGRAM
Drive Side R/B
DIAGNOSTICS
Center J/B
1 2
R- -L
R- -L
3D 3D
2
1F
Engine Room R/B
7.5A STA
2
2
1
5
B
1H
8
4
R
Ignition
Switch
2 7
W
W- -B
1 IH
2
1
II
2
Engine Room R/B
W
2
From Ignition Switch
1
2
1
2
1
2
B--L
W
Battery
- - ENGINE (2RZ- -FE, 3RZ- -FE)
Neutral
6
Start Switch
2
Y- -B
10
IC1
4
R- -L
7
IC3
3
LG
IC1
1
5 6
P- -B
V- -Y
IC1
(A/T)
V- -Y
(A/T)
C
V- -Y
(A/T)
15
C
P- -B
2
IJ1
(M/T)
8
V- -Y
P- -B
(A/T)
IC1
(M/T)
IJ1 25
P- -B
V- -Y
(A/T)
Engine Room R/B
2
1
2
5 3
2
Starter Relay
B--W
1
1
S2
S3
CONTINUED
3RZ-F,3RZ-FE Pages From Supplement
TO MODEL INDEX
Engine ECU
18 2
Y- -B
E6
19 L
LG
E6
1
NSW
E6
C
C
P- -B
(M/T) +B
STA
11
V- -Y
E6
(A/T)
2
B--W
2
W--B
2
EB1
B--W
A
J1 J/C
A
EB
DI- -167
DI1IT- -01
A02407