P01559
Throttle Valve
From
Air
Cleaner
Signal
ECM
Valve
IAC Valve
To Cylinders
Intake Air Chamber
A14829
FL
MAIN
Battery
EE
3
7
2
5
EFI
Engine Room J/B No.2
EFI Relay
1
2
3
5
2B
2K
2J
2C
W-B
IAC Valve
9
IH1
BR
2
1
3
16
ECM
RSO
E01
Y-G
MREL
B+
E8
8
*: USA 15A Canada 20A
E12
R-W
B-Y
12
11 3B
3A
B-L
W
B-Y
J/B No.3
B-R
A
EC
J14
J/C
A
BR
DI-100
-
DIAGNOSTICS
ENGINE
254
Author:
Date:
2001 SIENNA (RM787U)
DTC
P0505
Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located in front of the in-
take air chamber and intake air bypassing the throttle valve is
directed to the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle-up and
provide feedback for the target idling speed.
DTC No.
DTC Detecting Condition
Trouble Area
P0505
Idle speed continues to vary greatly from target speed
(2 trip detection logic)
IAC valve is stuck or closed
Open or short in IAC valve circuit
Open or short in A/C signal circuit
Air intake (hose loose)
ECM
WIRING DIAGRAM
DI22E-03
Содержание RM787U
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