Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0505
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DI-100
DIAGNOSTICS - ENGINE
DI22E-03
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located in front of the in-
Intake Air Chamber take air chamber and intake air bypassing the throttle valve is
Throttle Valve directed to the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
From
regulated, controlling the engine speed.
Air The ECM operates only the IAC valve to perform idle-up and
Cleaner
provide feedback for the target idling speed.
Signal
ECM
IAC Valve
Valve To Cylinders
P01559
DTC No. DTC Detecting Condition Trouble Area
S IAC valve is stuck or closed
S Open or short in IAC valve circuit
Idle speed continues to vary greatly from target speed
P0505 S Open or short in A/C signal circuit
(2 trip detection logic)
S Air intake (hose loose)
S ECM
WIRING DIAGRAM
ECM
IAC Valve 16
R-W RSO
E12
12 1
B-Y
IH1 E01
B-Y 2
BR
9 3A 3
J/B No.3
J14
Engine Room J/B No.2 J/C
FL 11 3B
MAIN 3 EFI 2
W B-R B+
2B 2J A
B-L 5 3 A
5 7 8
W-B Y-G MREL
2C 2K E8
2 1
Battery EFI Relay BR
EE EC
*: USA 15A Canada 20A A14829
2001 SIENNA (RM787U)
Author : Date : 254
DI-101
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Check engine idle speed.
PREPARATION:
(a) Warm up engine to normal operating temperature.
(b) Switch off all accessories.
(c) Switch off air conditioning.
(d) Shift transmission into "N" or neutral position.
(e) Connect the OBD II scan tool or TOYOTA hand-held tester to DLC3 on the vehicle.
(f) Using SST, connect terminals TE1 and E1 of the DLC3.
CHECK:
Check the difference of engine speed between the ones less than 5 sec. and more than 5 sec. after connect-
ing terminals TE1 and E1 of the DLC1.
OK:
Difference of engine speed: More than 100 rpm
OK Go to step 6.
NG
2001 SIENNA (RM787U)
Author : Date : 255
DI-102
DIAGNOSTICS - ENGINE
2 Check voltage between terminals RSO, RSC of ECM connector and body ground.
ON PREPARATION:
(a) Remove the glove compartment (See page SF-84 ).
(b) Disconnect the E12 connector of ECM.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals RSO, RSC of the ECM
connector and body ground.
OK:
E12
Voltage: 9 - 14 V
RSO (+) RSC (+)
A02031
OK Go to step 4.
NG
3 Check IAC valve (See page SF-50 ).
NG Replace IAC valve.
OK
Check for open and short in harness and connector between engine room J/B and IAC valve, IAC
valve and ECM (See page IN-31 ).
4 Check operation of IAC valve (See page SF-47 ).
NG Repair or replace IAC valve.
OK
2001 SIENNA (RM787U)
Author : Date : 256
DI-103
DIAGNOSTICS - ENGINE
5 Check the blockage of IAC valve and the passage to bypass the throttle valve.
NG Repair or replace IAC valve.
OK
Check and replace ECM (See page IN-31 ).
6 Check for A/C signal circuit (See page AC-133 ).
NG Repair or replace.
OK
Check air induction system (See page
SF-1 ).
2001 SIENNA (RM787U)
Author : Date : 257
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