With this post I will try to add as much VVT-i information about the 2jz as possible. 1Jz info is missing for the most part so if you happen to have information that should be on this site, please don’t hesisate to e-mail me with all the details!
A lot of information is sourced over the past years, and a lot of extra information was sourced from 2jzgarage.com. Thanks!

VVT-I wiring diagrams

These diagrams shown below also include non-vvti diagrams, please ensure you check the year of model at top of diagram.

VVTI gasket and overhaul Part numbers

04111 GASKET KIT, ENGINE OVERHAUL

04111-46055 (05/1993 – 07/1997)
04111-46056 (08/1997 – 07/2002)

04112 GASKET KIT, ENGINE VALVE GRIND

04112-46055 (05/1993 – 07/1997)
04112-46056 (08/1997 – 07/2002)

15100 PUMP ASSY, OIL

15100-46051 (05/1993 – 03/1997)
15100-46052 (04/1997 – )

Looms and pins

These are the body loom and other connector pins (from the orange plug in the footwell near the ECU – to the ABS plugs) –
A big thanks to Wilbo (AU supraforums), Lacho (2JZGarage reader) and EMPEROR on (UK mkiv forums)
*Note – You should be able to reference the wiring diagrams to the correct PIN and connector numbers, these tables just make it easier to read in some instances.

For download here:

Body_Loom_Connectors.pdf

(taken from here)

Supra 2JZGTE VVTI ECU Pinouts (97.8-02) in both XLS and PDF format

Supra_2JZGTE_VVTi_ECU_Pinouts.pdf

Supra_2JZGTE_VVTi_ECU_Pinouts.xls

And the ETCC ecu pins:

VVTi Coil and igniter diagrams

After seeing an incorrect 2jzgte vvti coil and wiring diagram online I quickly put a simple one together that will come in handy!
This is useful for working on the coils and igniter, please refer to more in-depth wiring diagrams when tracing wiring or working on more in depth wiring problems such as the VVTi wiring diargams you can find HERE. I have confirmed this with IS300 workshop manual, Japanese wiring diagrams and also my own car.

Yes the coils are numbered 1,3,2!!!

(found on 2jzgarage)

(VVTi 2JZGTE left – Japan Only, VVTi 2JZGE Right – US/UK Only – This is true for supras, other toyotas may have had these engines available in other models)

Specs:

• The VVTi 2jzgte came in JZA80 Supra from September 1997 – July 2002
• Max Power: 209 @ 5600 (280 hp)
• Torque (nm) 46.0 @ 3600 (338ft/lb)
• Injectors: 440cc
• Injector Impedance: High Impedance
• Stock recommended Denso plugs: PK20TR11
• Stock recommended NGK plugs: BKR6EKPB11
• Airflow Sensor: Hot wire type airflow meter
• Fly by wire throttle (Still has throttle cable)
• Traction control is built into ECU
• ECU is OBDII based using JOBD specification/protocol (ISO 14230) but you cannot use the standard OBDII scanners to read error codes/diagnostics etc It still has a OBDII connector and can be scanned using a scanning tool and software, you can read more about this here – http://www.2jzgarage.com/2013/01/2jzgte-vvti-obd-scanning-and-information/
• Rev Limit: 7200rpm
• Speed cut: 180km/h

How VVTi Works 

How the ETCS-i (throttle control system) works

ETCS-i Troubleshooting
http://www.2jzgarage.com/2013/07/etcs-i-dbw-system-troubleshooting/

What is VVTi: –

Variable valve timing with inelligence(VVT-i)optimizes engine efficency by constantly retarding or advancing intake valve timing depends on conditions and engine speeds. The result is exceptional low-end torque to get you off the line ,mid–rang punch for passing situations and clean-burning efficiency throughout the rev range.
Unlike some systems that switch between two compromise settings,VVT-i adjust continuously,tailoring performance to suit virtually any situation.
Some further reading and explanation of VVTi with diagrams: http://blog.lexus.com/2008/02/vvt-i-its-all-a.html

Are VVTi head components different then non-vvti?
Yes and no! The vvti has a different Intake cam/cam gear (As it’s VVTi!) Aftermarket cams are available for the VVTi such as HKS’s Valcon system yet they are expensive, a custom grind is probably a more viable option. Link to HKS Valcon Unit: http://www.hks-power.co.jp/products/…on/valcon.html

The exhaust cam/cam gear is the same as the non-vvti exhaust cam and can take aftermarket cams such as HKS, JUN etc.
The actual head components are the same (Well at least interchangeable with non vvti and aftermarket parts). These parts are listed below. The only difference I found in part numbers were the shims, not sure on differences, may only be part updating and no physical change.

Is the VVTi engine weaker?
No, some Toyota lovers will know that most of the later model vvti engines such as (1UZ, 3UZ etc) had weaker rods. The VVTi 2JZGTE rods are the exact same size as the non-vvti units. Also the crank is exactly the same and so are the pistons and everything else in the bottom end. Below I have listed all the parts and they are exactly the same, they have been confirmed in the EPC (Toyota Electronic Parts Catalog) Pics are also shown below in the end of the post. The only 1 different part number I found was the crank pulley (not the whole dampner/balancer, just the pulley, look like exactly the same thing, and they are!)

What parts are the same as non-vvti? (Confirmed from EPC and personal experience and research)

Bottom end:
Shortblock: Yes
Balancer: Yes
Pistons: Yes
Piston Rings: Yes
Bearings (Rod and crankshaft): Yes
Rods and rod bolts: YES! YES! YES!
Crank: Yes
Oil Pump: Need to confirm but most likely YES – They have a different part number, but only at the last number which usually means they were the same unit but updated when new series started etc. Also there is no seperate diagram which also is a good indicator they are the same.

Head:
Exhaust Cam/Cam Gear: Yes
Intake Cam/Cam Gear: No
Springs: Yes
Retainers: Yes
Buckets: Yes
Seats: Yes
Intake and exhaust valves: Yes
Valve guides: Yes
Lifters: Yes
Locks: Yes
Seats: Yes
Shims: Same size and fit but different part numbers

Other:
Timing Belt: Yes
Top radiator pipe: No (Different size – due to intake cam lump)
Throttle cable: No (Different size)
Intake manifold: Can be swapped but has different vacuum piping/different IACV and of course different Electronics/TRAC/Throttle Body
Exhaust Manifold: Yes

Electrics/ECU:
ECU: No
TRAC: No (Built into the ECU)
VVTi – ETCS Fuse 15amp Non vvti – TRAC fuse with 7.5amp

Aristo Engine differences:
The VVTi 2jzgte engine also came in the 1998-2005 Aristo V300 (JZS161), as I’ve done a conversion using this engine I can provide some information on the differences.

I’ve outlined the detailed changes and pictures on my – Toyota Supra NA-TT conversion – Aristo engine differences – Part 4.

There is also some more information on my project conversion thread from supraforums AU – Project SZR to TT.

As a general overview – If you are swapping this engine into a supra you will need to do the following:

• Aristo power steering pump has a solenoid valve which the supra doesn’t, mainly this effects the power steering lines as the bolt configuration is different, you will need a supra one
• The water pump is the same on the VVTi and is not hydro – it will not need to be changed
• The Aristo has a front mounted sump, you will need to change to a supra mid mounted sump layout.
• Engine loom will need to be modified or swapped for a supra unit
• Engine Mounts and brackets will need to be swapped
• Brake booster bung (Goes to top of intake manifold)
• o2 sensor loom plug will need to be swapped
• Water temp sender (Not sensor) will need to be purchased and installed
• Oil level sensor plug may need to be purchased
• Heater hoses from engine will need to purchased as the aristo ones are different
• Oil dip stick bracket is different
• Oil return lines from turbos are different
• Fuse box will need custom wiring, some differences: ETSC (TRAC Control) fuse is 15amp and needs to go to 5 pin connector under fuse box, I setup the wiring for the electric FAN (Don’t have them though), EFI1 and EFI2 relays and fuses were setup as NA only uses one EFI relay, this required wire from 5 pin connector under the fuse box and also modifying the EFI relay wiring.