A02466
Throttle Position Sensor
4
3
L--Y
LG--B
Engine ECU
E4
E4
19
16
IDL
E2
DI--44
--
DIAGNOSTICS
ENGINE (1RZ--E)
DTC 51 Switch Condition Signal Circuit
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.
Detection Item
Trouble Area
51
(1)
3 sec. or more after engine starts
idle switch OFF (IDL1).
(3)
A/C switch ON.
S
Throttle position sensor IDL circuit
S
Accelerator pedal and cable
S
A/C switch circuit
S
Engine ECU
HINT:
In this circuit, diagnosis can only be made in the test mode.
WIRING DIAGRAM
DI1HW--01
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Pages From Supplement
3RZ-F,3RZ-FE