Toyota 1RZ Supplement Manual page 156

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Variable Resistor Circuit.
CIRCUIT DESCRIPTION
This resistor is used to change the air--fuel ratio of the air--fuel mixture.
The idle mixture is adjusted using this resistor.
Turning the idle mixture adjusting screw clockwise moves the contacts inside the resistor, raising terminal
VAF voltage. Conversely, turning the screw counterclockwise lowers the terminal VAF voltage.
When the terminal VAF voltage rises, the ECU increases the injection volume slightly, making the air--fuel
mixture a little richer.
WIRING DIAGRAM
Variable Resistor
DIAGNOSTICS
VCC
2
VAF
3
E2 1
3RZ-F,3RZ-FE
- - ENGINE (1RZ- -E)
P
G--B
LG--B
CONTINUED
Pages From Supplement
TO MODEL INDEX
DI- -67
DI1I3- -01
Engine ECU
5 V
18
VC
E4
10
VAF
E4
E1
16
E2
E4
A02465