SF1MH-01
F02201
E1
DLC1
TC
F02201
E1
DLC1
TC
B06684
Disconnect
Plug
Plug
-
SFI
IDLE AIR CONTROL (IAC) VALVE
SF-47
1122
Author:
Date:
2001 SIENNA (RM787U)
IDLE AIR CONTROL (IAC) VALVE
ON-VEHICLE INSPECTION
1.
INSPECT IAC VALVE OPERATION
(a)
Initial conditions:
Engine at normal operating temperature
Idle speed checked correctly
Transmission in neutral position
A/C switch OFF
(b)
Using SST, connect terminals TC and E1 of the
DLC1.
SST
09843-18020
(c)
After engine speed is kept at approx. 1,000 rpm for 5 se-
conds, check that it returns to idle speed.
If the engine speed operation is not as specified, check the IAC
valve, wiring and ECM.
(d)
Remove the SST from the DLC1.
SST
09843-18020
2.
INSPECT AIR ASSIST SYSTEM
(a)
Initial conditions:
Engine at normal operating temperature
Idle speed checked correctly
Transmission in neutral position
A/C switch OFF
(b)
Using SST, connect terminals TC and E1 of the DLC1.
SST
09843-18020
(c)
After engine speed is kept at 900 - 1,300 rpm for 10 se-
conds, check that it returns to idle speed.
(d)
Stop the engine.
(e)
Remove the V-bank cover.
(f)
Disconnect the air assist hose from the air pipe, and block
off the IAC valve exit and the entry to the pipe.
(g)
Start the engine and check that the idle speed reaches
500 rpm or below (the engine may stall).
If the idle does not reach 500 rpm or below, check for a leak be-
tween the air assist hoses, pipe and injectors.
(h)
Remove the SST from the DLC1.
SST
09843-18020
(i)
Reconnect the air assist hose to the air pipe.
(j)
Reinstall the V-bank cover.
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