Toyota Sienna Service Manual: Inspection
1. INSPECT OIL PUMP RELIEF VALVE
(a) Coat the relief valve with engine oil and check that it falls smoothly into the valve hole under its own weight.
If the valve does not fall smoothly, replace the relief valve. If necessary, replace the oil pump assembly.
2. INSPECT OIL PUMP ROTOR SET
(a) Install the rotors to the timing chain cover with the rotors' marks facing outward. Check that the rotors rotate smoothly.
(b) Check the tip clearance.
(1) Using a feeler gauge, measure the clearance between the drive and driven rotors, as shown in the illustration.
Tip clearance 
If the clearance is greater than the maximum, replace the drive and driven rotors.
(c) Check the side clearance.
(1) Using a feeler gauge and precision straightedge, measure the clearance between the rotors and precision straightedge, as shown in the illustration.
Side clearance 
If the side clearance is greater than the maximum, replace the timing chain cover.
(d) Check the body clearance.
(1) Using a feeler gauge, measure the clearance between the timing chain cover and driven rotor, as shown in the illustration.
Body clearance
If the body clearance is greater than the maximum, replace the timing chain cover.
Disassembly
1. REMOVE OIL PUMP RELIEF VALVE
(A) using a 27 mm socket wrench, remove the relief
valve plug.
(B) remove the valve spring and oil pump relief valve.
2. REMOVE OIL PUMP COVER
(a) Remove ...
Reassembly
1. INSTALL OIL PUMP COVER
(a) Coat the drive and driven rotors with engine oil and
place them into the timing chain cover with the
marks facing outward (oil pump cover side). Check
that the ro ...
Other materials:
Precaution
NOTICE:
When the ignition switch is turned off and the engine
temperature is high, the cooling fans may operate for
approximately 3 minutes.
After turning the ignition switch off, keep hands and
objects away from the fans when they are operating.
HINT:
If al ...
Mute Signal Circuit between Radio Receiver and Television Display
Assembly
DESCRIPTION
The radio receiver controls the volume according to the MUTE signal from the
television display
assembly.
The MUTE signal is sent to reduce noise and a popping sound generated when
switching the mode, etc.
If there is an open in the circuit, noise can be heard from the speake ...
ACIS Control Circuit
DESCRIPTION
This circuit opens and closes the Intake Air Control Valve (IACV) in response
to changes in the engine
load in order to increase the intake efficiency (ACIS: Acoustic Control
Induction System).
When the engine speed is between 0 and 4450 rpm and the throttle valve opening
angl ...
