Toyota 1RZ Supplement Manual page 133

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DI- -44
DTC
CIRCUIT DESCRIPTION
Air Conditioning Switch Signal
The ECU uses the output from the air conditioning switch to determine whether or not the air conditioning
is operating so that it can increase the idling speed of the engine if necessary.
Throttle Position Sensor IDL Signal
The IDL contacts are mounted in the throttle position sensor, and detects the idle condition.
DTC No.
(1)
51
(3)
HINT:
In this circuit, diagnosis can only be made in the test mode.
WIRING DIAGRAM
Throttle Position Sensor
DIAGNOSTICS
51 Switch Condition Signal Circuit
Detection Item
3 sec. or more after engine starts
idle switch OFF (IDL1).
A/C switch ON.
4 3
LG--B
- - ENGINE (1RZ- -E)
S Throttle position sensor IDL circuit
S Accelerator pedal and cable
S A/C switch circuit
S Engine ECU
19
L--Y
E4
16
E4
CONTINUED
3RZ-F,3RZ-FE Pages From Supplement
TO MODEL INDEX
Trouble Area
Engine ECU
IDL
E2
DI1HW- -01
A02466