Article by: Rod Garnett
There are 6 variants of the engine. Crown (pre-96), Crown
(post-96), SC400 (or Soarer for JDM versions), SC400 active or
UZZ32, LS400 and Celsior
To assist in engine identification the vehicles model numbers
The cosmetic differences are quite wide ranging and you should
ensure you check for as many indicators as possible to
positively identify an engine.
Crown Royal Saloon (1989-1992ish) UZS-131 cut off dates are
probably September but no one is certain.
Crown Majesta (1992-1996ish) UZS-141 & UZS-151
Air suspension UZZ-31 (is identical engine wise to SC400 so will
be treated as an SC400).
Coil and air suspension UZZ-30, UZZ31
Active (hydraulic) suspension UZZ-32
LS400/Celsior UCF10, UCF11, UCF20, UCF21 & UCF30
Crown - plenum has a 4
CAM 32 badge on the plenum and the plug covers say "Toyota".
SC400 - has the Toyota logo on the plenum and V8 FOUR CAM 32
on the plug covers
LS400 - has an "L" badge on the plenum and "V8 FOUR CAM 32 on
the plug covers.
Celsior - has the Toyota logo on the plenum and V8 FOUR CAM 32
on the plug covers.
Crown (pre-96) - Traditional steel mounts with a rubber
isolating block with 4 fasteners.
Crown (post-96) - cast Alloy "ears" that stick straight out with
a rubber isolator with one stud each end.
SC400 - cast Alloy "ears" that stick straight out with a rubber
isolator with one stud each end. Same as Crown (post-96)
LS400 - cast alloy "ears" that sweep forward and out with a
rubber isolator with one stud each end.
Celsior as per LS400
Early Crown - UZS131 has mid bowl without an oil level gauge.
Dipstick runs down thru head to sump.
Crown Royal Majesta - UZS 141 & UZS151 has front sum like an
SC400 -Rear bowl sump with oil level gauge. Dipstick in an
LS400 - Front bowl sump with oil level gauge and dipstick in an
Celsior - Front bowl sump with oil level gauge and dipstick in
an external tube.
Oil pans are not interchangeable without the alloy intermediate
plate. Swapping sumps requires the oil pan, intermediate plate,
windage tray, oil pickup, oil level gauge (where fitted) and
All plenums are the same except for the badge on top.
Crown all have traction control on Throttle body.
SC400 - may or may not have traction control depending on model
LS400 - all have traction control.
Celsior - all have traction control.
Resonance chamber is different between all three engines.
Intake pipe is different between all three engines.
Air filter assembly:
Crown UZS131 - use round assembly.
Crown UZS 141 & UZS151 uses rectangular assembly.
SC400 - uses rectangular assembly.
LS400 - use round assembly
Celsior use round assembly
Crown and SC400 fuel lines enter and exit from behind the cam
LS400 fuel lines enter and exit lower on the engine. They enter
and exit under the exhaust manifold
The early 1uz 1989-1994 have billet fuel rails.
The later 1uz 1995-1997 have cast alloy fuel rails.
Crown UZS131 - 215cc
Crown UZS 141 & UZS151 215cc
SC400 - 251cc
LS400 - 215cc
Crown - has viscous fan driven from an idler above the crank
SC400 - has hydraulic fan driven by a pump in the same location
as the Crown idler.
LS400 has viscous fan driven from an idler above the crank
Celsior - has viscous fan driven from an idler above the crank
The belt idler mount (the alloy spider fitting) on the engines
are different to allow for the different fan arrangements.
Whilst different they can be interchanged so you can use a Crown
on any engine and vice versa.
The Active Sc400 UZZ32 uses a unique front cover to support the
suspension pump and other ancillaries. It runs 2 serpentine
Oil filters mounting assemblies:
Crown UZS131 - has the filter mounted at the rear of the engine
with a long rigid adaptor bolting to the front of the engine and
supported at the rear.
Crown UZS 141 & UZS151 - same as SC400
SC400 - have filter mounted below air conditioning compressor
LS400 - have filter mounted below the air conditioning
compressor like the SC400 but slightly further back.
Celsior have filter mounted below the air conditioning
compressor like the SC400 but slightly further back.
Crown UZS131 - p/s pump has the reservoir attached to it.
Crown UZS 141 & UZS151 - p/s pump has the reservoir attached to
SC400 - uses remote reservoir.
LS400 - p/s pump has the reservoir attached to it.
Celsior - p/s pump has the reservoir attached to it.
Crown UZS131 - no bleed line off the housing.
Crown UZS 141 & UZS151 - no bleed line off the housing.
SC400 - has 1 bleed line from the housing
LS400 - has one bleed line to the reservoir.
Celsior - has one bleed line to the reservoir.
Crown UZS131 - does not have provision for oil level gauge.
Crown UZS 141 & UZS151 Oil gauge in alloy intermediate plate
SC400 - some models do not have Trac so a different loom
SC400 - Active is unique and wont interchange to another
LS400 same as Celsior.
Celsior Same as LS400
Whilst you can interchange the harness between different engines
some differences do occur. Oil level gauge sender on LS400 and
Celsior models are on the right hand side at the front (behind
the power steering pump)whilst the gauge sender on SC400s is in
the centre of the engine on the left hand side (behind the air
Early 1UZ 1989-1994 10.1:1
Later 1UZ post September 1994 10.4:1
The Crown puts out less power (around 10-15hp less) than the
SC400 or LS400 partly because of the restrictive exhausts.
Crown UZS131 - has two modules the ECU runs the engine and the
ECT runs the transmission. The ECU is happy to run without the
Crown UZS 141 & UZS151 has single ECU/ECT and can be hard to
run without the transmission or external sensors.
SC400 - uses single ECU/ECT.
LS400 - uses single ECU/ECT.
Celsior - uses single ECU/ECT.
Whilst the Crown UZS 141, UZS151, SC400, LS400 & Celsior use a
combined ECU/ECT they are not interchangeable.
All three have different, but nonetheless inefficient
headers/manifolds. Cats mount in different locations as well.
Crown - by far the smallest least efficient setup. Good if room
SC400 the in between set.
LS400 - neat LOG style headers that should fit in some tight
Celsior as for LS400
Air conditioning compressors:
Front sump engines use a shorter compressor to clear the
frontsump aircon compressor
Mid and rear sump use longer compressor.
midsump aircon compressor
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