A02465
Engine ECU
5 V
E1
VC
VAF
E2
E4
E4
E4
18
10
16
P
G--B
LG--B
VCC
VAF
E2
Variable Resistor
2
3
1
--
DIAGNOSTICS
ENGINE (1RZ--E)
DI--67
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
DI1I3--01
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Pages From Supplement
3RZ-F,3RZ-FE