Wiring the 1UZ-FE into a Pre-89 Supra

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#1
Hi all, I thought I would put together a complete “guide” if you will for a Pre-89 1UZ-FE swapped Supra. This swap is gaining in popularity so I figured if we have a good platform to get wiring information it would help ease the process. First I will list the Supra connectors, then a short description, and pin layout. Then I will list the 1UZ-FE connectors, then a short description, and pin layout. Finally I will give a “guide” to connecting the two to make a running vehicle. This "guide" will be dynamic until otherwise said, so I will be updating this periodically as I gain information.

I used a EWD Book for a 1986.5 Supra (NA Only), and a EWD book for a 1994 SC (300 & 400), and 1997 SC (300 & 400). 1994-1997 SC3/400 from my understanding were transition years in wiring much like our Pre-89 to 89 to Post-89 Supra wiring. So I have started with a 1994 EWD, I just recently picked up a 1997 EWD, and I plan to get a 1996 soon. In my 87 I have a post 1996 (A transition year for the 1UZ) and I noticed a few extra wires on plug IJ1 that needed power but the 1994 book worked just fine.


Since there is so much information I will attempt to post in separate replies, Thanks for looking.

---------- Post added at 10:54 PM ---------- Previous post was at 10:52 PM ----------

Pre-89 NA Toyota Supra:



Interior:

- B-1 – 22 Pins, Yellow in color

o Pin 1 – Black-Yellow in color
§ From “Water VSV” to “Air Mix Control”

o Pin 2 – Red-White in color
§ From “ECT ECU” to “ECU”

o Pin 3 – Red in color
§ From “ECT ECU” to “ECU”

o Pin 4 – Black in color
§ From “ECT ECU” to “ECU”

o Pin 5 – Black-Red in color
§ From “Fuel Pump” to “Check Connector”

o Pin 6 – Green in color
§ From “Circuit Open Relay” to “Air Flow Meter”

o Pin 7 – Black-Light Blue in color
§ From “Circuit Open Relay” to “ECU” and “Starter” (A/T Only)

o Pin 8 – Yellow in color
§ From “ECU” to “Fuel Pump Control Relay”

o Pin 9 – Black-Red in color
§ From “EFI Main Relay” to “Circuit Open Relay”

o Pin 10 – Empty
§ No pin

o Pin 11 – White in color
§ From “A/T Indicator S/W” to “ECT ECU”

o Pin 12 – Black-White in color
§ From “Starter Relay” to “Starter”

o Pin 13 – Light Blue in color
§ From “AC Amplifier” to “ECU”

o Pin 14 – Violet in color
§ From “TEMS ECU” to “Check Connector”

o Pin 15 – Black-Yellow in color
§ From “Cruise Control Clutch S/W” to “ECU”

o Pin 16 – Black-Orange in color
§ From “7.5A IGN Fuse” to “ECU”

o Pin 17 – Black-Orange in color
§ From “Ignition S/W” to “Igniter” and “EFI Resistor”

o Pin 18 – Yellow in color
§ From “Theft Horn” to “Integration Relay No.2”

o Pin 19 – Red-Yellow in color
§ From “Headlight Relay” to “ECU”

o Pin 20 – White-Light Blue in color
§ From “Super Monitor” to “ECU”

o Pin 21 – Red-Green in color
§ From “Super Monitor” to “ECU”

o Pin 22 – Brown in color
§ From “Super Monitor” to “Ground” on Intake Manifold



- B-2 – 14 Pins, White in color

o Pin 1 – Green in color
§ From “A/T” Indicator S/W” to “ECT ECU”

o Pin 2 – Red-Green in color
§ From “ECT Solenoid” to “ECT ECU”

o Pin 3 – Green-Yellow in color
§ From “ECT Solenoid” to “ECT ECU”

o Pin 4 – Yellow in color
§ Dead Ends From Engine Harness to B-2

o Pin 5 – Black in color
§ Dead Ends From Engine Harness to B-2

o Pin 6 – Red in color
§ From “Cruise Control Computer” to “ECT ECU” and “ECU”

o Pin 7 – Light Blue in color
§ From “A/T Indicator S/W” to “ECT ECU”

o Pin 8 – Green-Black in color
§ From “ECT Solenoid” to “ECT ECU”

o Pin 9 – Red-Light Blue in color
§ From “ECT Solenoid” to “ECT ECU”

o Pin 10 – Red in color
§ Dead End

o Pin 11 – Blue-Yellow in color
§ Dead End

o Pin 12 – Red-Black in color
§ Dead End

o Pin 13 – Yellow-Blue in color
§ From “ECT ECU” to “Comb. Meter (SPD Sensor)”

o Pin 14 – Yellow-Black in color
§ From “Check Connector” to “ECT ECU”



- M-1 – 10 Pins, Yellow in color

o Pin 1 – Red-Black in color
§ From “Back Up S/W to “Back Up Lights”

o Pin 2 – Yellow in color
§ From “7.5A Gauge Fuse” to “Back Up Lights”

o Pin 3 – Pink in color (Engine Harness Side)
§ From “ECU” to “Comb. Meter (SPD Sensor)”

o Pin 4 – Black in color
§ From “Igniter” to “Super Monitor”, “ECU”, and “Comb. Meter” (Tach signal)

o Pin 5 – Empty
§ No Pin

o Pin 6 – Brown in color
§ From “Comb. Meter” to “Ground (Intake Manifold)”

o Pin 7 – Yellow-Black in color
§ From “Oil Pressure Sending Unit” to “Comb. Meter”

o Pin 8 – Gray-Green in color
§ From “ECU” to “CEL (Check Engine Light)”

o Pin 9 – Yellow-Green in color
§ From “Water Temp Sensor” to “Comb. Meter”

o Pin 10 – Violet in color
§ From “Defogger Relay” to “ECU”



Engine Bay:

- C-1 – 6 Pins, Yellow in color

o Pin 1 – Black-Yellow in color
§ From “15A EFI Fuse” to “ECU”

o Pin 2 – Black-Orange in color
§ From “ECU” to “EFI Main Relay”

o Pin 3 – White in color
§ From “15A Haz-Horn Fuse” to “Theft Horn”

o Pin 4 – Black-Red in color
§ From “EFI Main Relay” to “ECU”

o Pin 5 – White-Black in color
§ From “AFM” to “Ground (Left Fender)”

o Pin6 – Empty
§ No Pin

---------- Post added at 10:56 PM ---------- Previous post was at 10:54 PM ----------

1994 Lexus SC400:



Interior:

- IJ1 – 14 Pins, Gray in color

o Pin 1 – Green in color
§ From “FPECU” to “Check Connector”

o Pin 2 – Red-Blue in color
§ From “10A HTR Fuse” to “Water VSV”

o Pin 3 – Empty
§ No Pin? Confirm?

o Pin 4 – White in color
§ From “25A Haz-Horn Fuse” to “Haz Horn”

o Pin 5 – Empty
§ No Pin? Confirm?

o Pin 6 – Black-White in color
§ From “IGN S/W” to “Neutral Safety S/W”

o Pin 7 – Empty
§ No Pin? Confirm?

o Pin 8 – Pink in color
§ From “ECU” to “FPECU”

o Pin 9 – Black-Orange in color
§ From “Haz-Horn” to “Theft ECU”

o Pin 10 – Yellow in color
§ From “10A Gauge Fuse” to “Back Up S/W”

o Pin 11 – Empty
§ No Pin? Confirm?

o Pin 12 – Black-Red in color
§ From “EFI Main Relay” to “FPECU” and “Sub o2 Sensors”

o Pin 13 – White-Black in color
§ From “Trac ECU” to “Ground”

o Pin 14 – Red-Green in color
§ From “ECU” to “FPECU”



- IJ2 – 17 Pins, Gray in color

o Pin 1 – Red in color
§ From “Cruise CTRL ECU” to “ECU”

o Pin 2 – White-Red in color
§ From “Cruise CTRL ECU” to “ECU”

o Pin 3 – Pink in color
§ From “Comb. Meter” to “ECU”

o Pin 4 – Green-Blue in color
§ From “Cruise CTRL ECU” to “ECU”

o Pin 5 – Empty
§ No Pin? Confirm?

o Pin 6 – Light Green-Black in color
§ From “Progressive Power Steering ECU” to “PPS Solenoid”

o Pin 7 – Green-White in color
§ From “Stop Light S/W” to “ECU”

o Pin 8 – Empty
§ No Pin? Confirm?

o Pin 9 – Brown-Yellow in color
§ From Cruise “CTRL ECU” to “ECU”

o Pin 10 – Empty
§ No Pin? Confirm?

o Pin 11 – Black-Orange in color
§ From “7.5A IGN Fuse” to “ECU”

o Pin 12 – Black-Red in color
§ From “15A ECU-IG Fuse” to “Trac ECU”

o Pin 13 – Empty
§ No Pin? Confirm?

o Pin 14 – Empty
§ No Pin? Confirm?

o Pin 15 – Empty
§ No Pin? Confirm?

o Pin 16 – Light Green-Red in color
§ From “PPS Solenoid” to “PPS ECU”

o Pin 17 – Blue in color
§ From “ECU” to “Kick Down S/W”



- IK1 – 23 Pin, Orange in color

o Pin 1 – Brown in color
§ From “Left o2 Sub” to “Ground”

o Pin 2 – Green – Yellow in color
§ From “ECU” to “Data Link Connector 2 (TDCL)”

o Pin 3 – Gray-Yellow in color
§ From “ECU” to “TDCL”

o Pin 4 – Light-Green-Red in color
§ From “ECU” to “TDCL”

o Pin 5 – Green-Red in color
§ From “ECU” to “TDCL”

o Pin 6 – Red in color
§ From “Speed Sensor” to “Comb. Meter”

o Pin 7 – Blue-Red in color
§ From “Speed Sensor” to “Comb. Meter”

o Pin 8 – Black in color
§ From “Igniter” to “Comb. Meter (Tach)”

o Pin 9 – Yellow-Green in color
§ From “Water Temp Sensor” to “Comb. Meter”

o Pin 10 – Pink-Black in color
§ From “Trac ECU” to “TDCL”

o Pin 11 – Black-Red in color
§ From “Back Up Light S/W” to “Back Up Lights”

o Pin 12 – Gray in color
§ From “P S/W” to “Comb. Meter”

o Pin 13 – Blue in color
§ From “N S/W” to “Comb. Meter”

o Pin 14 – Green-White in color
§ From “D S/W” to “Comb. Meter”

o Pin 15 – Empty
§ No Pin? Confirm?

o Pin 16 – Green in color
§ From “2 S/W” to “Comb. Meter”

o Pin 17 – White in color
§ From “1 S/W” to “Comb. Meter”

o Pin 18 – Empty
§ No Pin? Confirm?

o Pin 19 – Empty
§ No Pin? Confirm?

o Pin 20 – Yellow-Black in color
§ “Oil Pressure Sensor” to “Comb. Meter”

o Pin 21 – Green-Orange in color
§ From “ECU” to “Comb. Meter”

o Pin 22 – Gray-Red in color
§ From “ECU” to Comb. Meter”

o Pin 23 – Black-Yellow in color
§ From “Air Back Sensor ECU” to “Check Connector”



- IK2 – 25 Pins, White in color

o Pin 1 – White in color
§ From “Right o2 Sub” to “ECU”

o Pin 2 – Blue in color
§ From “Short Pin” to “Trac and ABS ECU”

o Pin 3 – Empty
§ No Pin? Confirm?

o Pin 4 – Light Green-Red in color
§ From “TRAC ECU” to “Comb. Meter”

o Pin 5 – White in color
§ From “TRAC ECU” to “Comb. Meter”

o Pin 6 – Empty
§ No Pin? Confirm?

o Pin 7 – Empty
§ No Pin? Confirm?

o Pin 8 – Empty
§ No Pin? Confirm?

o Pin 9 – Blue-Yellow in color
§ From “ECU” to “Comb. Meter (CEL)”

o Pin 10 – Violet-Red in color
§ From “Oil Level S/W” to “Comb. Meter”

o Pin 11 – Empty
§ No Pin? Confirm?

o Pin 12 – Red-Blue in color
§ From “Left o2 Sub” to “ECU”

o Pin 13 – Red-White in color
§ From “P-Brake S/W” to “TRAC ECU”

o Pin 14 – Empty
§ No Pin? Confirm?

o Pin 15 – Red in color
§ From “10A DOME Fuse” to “TRAC ECU”

o Pin 16 – Yellow-Red in color
§ From “TRAC Cut S/W” to “TRAC ECU”

o Pin 17 – Empty
§ No Pin? Confirm?

o Pin 18 – Red-Black in color
§ From “ABS ECU” to “TRAC ECU”

o Pin 19 – Empty
§ No Pin? Confirm?

o Pin 20 – Empty
§ No Pin? Confirm?

o Pin 21 – Empty
§ No Pin? Confirm?

o Pin 22 – Brown-White in color
§ From “Left o2 Sub” to “ECU”

o Pin 23 – Black in color
§ From “Neutral Safety S/W” to “Comb. Meter”

o Pin 24 – Brown-Black in color
§ From “Comb. Meter” to “Ground”

o Pin 25 – Violet in color
§ From “Short Pin” to “ABS ECU”



Engine Bay:



- EB1 – 8 Pins, Black in color

o Pin 1 – Light Blue in color
§ From “A/C Magnetic Clutch Relay” to “A/C Magnetic Clutch”

o Pin 2 – White in color
§ From “A/C Magnetic Clutch Relay" to "ECU"

o Pin 3 – Black in color
§ From “Neutral Safety S/W" to "Starter Relay"

o Pin 4 – Black-Yellow in color
§ From “30A EFU Fuse" to "ECU"

o Pin 5 – Light-Blue in color
§ From “7.5A TRAC Fuse" to "Traction ECU"

o Pin 6 – Black-Red in color
§ From “Short Pin" to "ABS Actuator Relay"

o Pin 7 – Brown in color
§ From “A/C Ambient Temp. Sensor" to "Ground"

o Pin 8 – Black-Orange in color
§ From “ECU" to "EFI Main Relay"



- EB2 – 3 Pins, Black in color

o Pin 1 – Black in color
§ From “Starter Relay” to “Starter”

o Pin 2 – Black-Orange in color
§ From “Ignition Main Relay" to "Ignition System" and "Fuel Injectors"

o Pin 3 – Black-Red in color
§ From "EFI Main Relay" to "ECU (+B & +B1" and "Misc. Equipment (+B)"

---------- Post added at 10:58 PM ---------- Previous post was at 10:56 PM ----------

1997 Lexus SC400:



Interior:

- IJ1 – 14 Pins, Gray in color

o Pin 1 – Empty
§ No Pin? Confirm?

o Pin 2 – Red-Light Blue in color
§ From “10A HTR Fuse” to “Water VSV”

o Pin 3 – Black-White in color
§ From "IGN S/W" to "Injectors" and "IGN Coil 2"

o Pin 4 – Light Green in color
§ From “25A Haz-Horn Fuse” to “Haz Horn”

o Pin 5 – Red in color
§ From "Vapor Pressure Sensor" to "ECU"

o Pin 6 – Black-White in color
§ From “7.5A ST Fuse” to “Neutral Safety S/W” and "ECU"

o Pin 7 – Black-White in color
§ From "IGN S/W" to "IGN Coil 1" and "Igniters" and "Injectors"

o Pin 8 – Pink in color
§ From “ECU” to “FPECU”

o Pin 9 – White in color
§ From “Haz-Horn” to “Theft ECU”

o Pin 10 – Yellow in color
§ From “10A Gauge Fuse” to “Back Up S/W”

o Pin 11 – Brown in color
§ From "Vapor Pressure Sensor" to "ECU"

o Pin 12 – Black-Red in color
§ From “EFI Main Relay” to “Sub o2 Sensors”

o Pin 13 – White-Black in color
§ From “Trac ECU” to “Ground”

o Pin 14 – Red-White in color
§ From “ECU” to “FPECU”



- IJ2 – 17 Pins, Gray in color

o Pin 1 – Red in color
§ From “Cruise CTRL ECU” to “ECU”

o Pin 2 – Red-White in color
§ From “Cruise CTRL ECU” to “ECU”

o Pin 3 – Orange in color
§ From “Comb. Meter” to "ECU"

o Pin 4 – Empty
§ No Pin? Confirm?

o Pin 5 – Light Blue-White in color
§ From "Cooling Fan ECU" to "Solenoid Valve (Cooling Fan)"

o Pin 6 – Light Green in color
§ From “Progressive Power Steering ECU” to “PPS Solenoid”

o Pin 7 – Green-White in color
§ From “Stop Light S/W” to “ECU” and "TRAC ECU"

o Pin 8 – Empty
§ No Pin? Confirm?

o Pin 9 – Brown-Yellow in color
§ From Cruise “CTRL ECU” to “ECU”

o Pin 10 – Empty
§ No Pin? Confirm?

o Pin 11 – Black-Orange in color
§ From “7.5A IGN Fuse” to “ECU”

o Pin 12 – Black-Yellow in color
§ From “15A ECU-IG Fuse” to “Trac ECU”

o Pin 13 – Green in color
§ From "7.5A TAIL Fuse" to "ECU"

o Pin 14 – Red-Black in color
§ From "Cooling Fan ECU" to "Data Link Connector 1"

o Pin 15 – Black in color
§ From "Solenoid Valve (Cooling Fan)" to "Cooling Fan ECU"

o Pin 16 – Yellow in color
§ From “PPS Solenoid” to “PPS ECU”

o Pin 17 – Empty
§ No Pin? Confirm?



- IK1 – 23 Pin, Orange in color

o Pin 1 – Brown in color
§ From “Both o2 Sub” to “Ground”

o Pin 2 – Green – Yellow in color
§ From “ECU” to “Data Link Connector 2 (TDCL)”

o Pin 3 – Shielded in color
§ From “Shielded Throttle Driver Wires” to “Throttle Driver”

o Pin 4 – Light Blue in color
§ From “TRAC ECU” to “Throttle Driver”

o Pin 5 – Black-White in color
§ From “TRAC ECU” to “Throttle Driver”

o Pin 6 – Red in color
§ From “Speed Sensor” to “Comb. Meter”

o Pin 7 – Light Blue-Red in color
§ From “Speed Sensor” to “Comb. Meter”

o Pin 8 – Light Green in color
§ From “Igniter” to “Comb. Meter (Tach)”

o Pin 9 – Yellow-Green in color
§ From “Water Temp Sensor” to “Comb. Meter”

o Pin 10 – Yellow in color
§ From “CRU CTRL ECU” to “Data Link Connector 1”

o Pin 11 – Light Blue in color
§ From “Back Up Light S/W” to “Back Up Lights”

o Pin 12 – Black-White in color
§ From “P S/W” to “Comb. Meter”

o Pin 13 – Light Blue-Yellow in color
§ From “N S/W” to “Comb. Meter”

o Pin 14 – Green-Yellow in color
§ From “D S/W” to “Comb. Meter”

o Pin 15 – White-Red in color
§ From "Data Link Connector 3" to "Ground"

o Pin 16 – Green in color
§ From “2 S/W” to “Comb. Meter”

o Pin 17 – White in color
§ From “1 S/W” to “Comb. Meter”

o Pin 18 – Black in color
§ From "ECU" to "Data Link Connector 3"

o Pin 19 – Brown in color
§ From "Shielded Black Pin 18 IK1" to "Ground"

o Pin 20 – Yellow-Black in color
§ “Oil Pressure Sensor” to “Comb. Meter”

o Pin 21 – Green-Orange in color
§ From “ECU” to “Comb. Meter”

o Pin 22 – Gray-Red in color
§ From “ECU” to Comb. Meter”

o Pin 23 – Red-Black in color
§ From “Oil Temp/Oil Level S/W” to “Comb. Meter”



- IK2 – 25 Pins, White in color

o Pin 1 – Green in color
§ From “Right o2 Sub” to “ECU”

o Pin 2 – Blue in color
§ From “Short Pin” to “Trac and ABS ECU”

o Pin 3 – Empty
§ No Pin? Confirm?

o Pin 4 – Light Green-Red in color
§ From “TRAC ECU” to “Comb. Meter”

o Pin 5 – White in color
§ From “TRAC ECU” to “Comb. Meter”

o Pin 6 – White in color
§ From "ABS SPD Sensor Rear Left" to "TRAC ECU"

o Pin 7 – Light Green in color
§ From "ABS SPD Sensor Rear Right" to "TRAC ECU"

o Pin 8 – Red in color
§ From "Right o2 Sub" to "ECU"

o Pin 9 – Blue-Yellow in color
§ From “ECU” to “Comb. Meter (CEL)”

o Pin 10 – Violet-Red in color
§ From “Oil Level S/W” to “Comb. Meter”

o Pin 11 – Red-White in color
§ From "Brake Fluid Level S/W" to "TRAC ECU"

o Pin 12 – Red-Light Blue in color
§ From “Left o2 Sub” to “ECU”

o Pin 13 – Black-Red in color
§ From “P-Brake S/W” to “TRAC ECU”

o Pin 14 – Empty
§ No Pin? Confirm?

o Pin 15 – Red in color
§ From “10A DOME Fuse” to “TRAC ECU”

o Pin 16 – Yellow-Red in color
§ From “TRAC Cut S/W” to “TRAC ECU”

o Pin 17 – Black in color
§ From "ABS SPD Sensor Rear Left" to "TRAC ECU"

o Pin 18 – White-Red in color
§ From “Shielded ABS SPD Sensor wire” to “Junction Connector”

o Pin 19 – Empty
§ No Pin? Confirm?

o Pin 20 – Empty
§ No Pin? Confirm?

o Pin 21 – Violet in color
§ From "ABS SPD Sensor Rear Right" to "TRAC ECU"

o Pin 22 – Brown-White in color
§ From “Left o2 Sub” to “ECU”

o Pin 23 – Green-Red in color
§ From “Neutral Safety S/W” to “Comb. Meter”

o Pin 24 – White-Black in color
§ From “Comb. Meter” to “Ground”

o Pin 25 – White-Green in color
§ From “Short Pin” to “ABS ECU”



Engine Bay:



- EB1 – 8 Pins, Black in color

o Pin 1 – Light Blue in color
§ From “A/C Magnetic Clutch Relay” to “A/C Magnetic Clutch”

o Pin 2 – White in color
§ From “A/C Magnetic Clutch Relay" to "ECU"

o Pin 3 – Green-Red in color
§ From “Neutral Safety S/W" to "Starter Relay"

o Pin 4 – Black-White in color
§ From “30A EFU Fuse" to "ECU"

o Pin 5 – Light Blue-Red in color
§ From “7.5A TRAC Fuse" to "Traction ECU"

o Pin 6 – Violet in color
§ From “Short Pin" to "ABS Actuator Relay"

o Pin 7 – Brown in color
§ From “A/C Ambient Temp. Sensor" to "Ground"

o Pin 8 – Black-Yellow in color
§ From “ECU" to "EFI Main Relay"



- EB2 – 3 Pins, Black in color

o Pin 1 – Black in color
§ From “Starter Relay” to “Starter”

o Pin 2 – Black-Red in color
§ From “EFI Main Relay" to "AFM (+B & +B1" and "Misc. Equipment (+B)"

o Pin 3 – Black-Red in color
§ From "EFI Main Relay" to "ECU (+B & +B1" and "Misc. Equipment (+B)"

---------- Post added at 11:00 PM ---------- Previous post was at 10:58 PM ----------



Guides:

1987 Supra to 1997 1UZ-FE


1987 Supra to 1993 LS400 1UZ-FE (This diagram is subject to change, since I have not done a LS400 1UZ-FE swap yet it may change as others give me input)
 
Last edited:

Satan

Active Member
Authorized Seller
Contributor
Joined
Mar 31, 2005
Messages
1,599
Likes
0
Location
Tampa
#2
Good stuff... I was able to gleem some 86.5 wiring knowledge from your info and can now move along with one of my projects.

THANKS!
 

ihiryu

New Member
Authorized Seller
Joined
Jul 12, 2008
Messages
209
Likes
0
Location
TX
#4
Wow good deal Chambers!

Definitely a great pin out! I really wish I had this when I was doing my swap ha ha!
 

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#12
The engine control wiring, mainly need to see if your book has the wiring for the cold start injector, mine does not. Thanks, you have a PM regarding the same subject.
 

TweakTech

Member
Authorized Seller
Joined
Apr 3, 2012
Messages
46
Likes
0
Location
Summerville, SC
#17
1992-1994 SCx00 are the same and 1995-1997 SCx00 are the same. In 1998 they started running the VVTi versions of both the 2JZ-GE and 1UZ-FE. For the purpose of putting a 1UZ into an MA70 chassis, the small changes in 1UZ harnesses is irrelevant.
 

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#18
...For the purpose of putting a 1UZ into an MA70 chassis, the small changes in 1UZ harnesses is irrelevant.
Not true, for MA70 swaps on the SC connector IJ1 pre 96 has less power wires for the electrical engine components. I had wired my jumper harness for pre 96 and my harness is from a 96, well it didn't run. Thats because some of the engine harness was not getting power. If you pull connectors from pre 96 SC vs 96-98 they differ slightly. IJ1 had the biggest change it seems, and from what I have learned the pre 96 fuel injectors are wired differently than the 96-98.
 

CheesePhantom

New Member
Authorized Seller
Joined
Mar 26, 2011
Messages
18
Likes
0
Location
Tampa, FL
#19
Not true, for MA70 swaps on the SC connector IJ1 pre 96 has less power wires for the electrical engine components. I had wired my jumper harness for pre 96 and my harness is from a 96, well it didn't run. Thats because some of the engine harness was not getting power. If you pull connectors from pre 96 SC vs 96-98 they differ slightly. IJ1 had the biggest change it seems, and from what I have learned the pre 96 fuel injectors are wired differently than the 96-98.
I don't suppose you could be more specific?
I'm doing a '96 1UZ into an '89 MA70, and I can't get my ECU to turn on. Post 96 1UZs have an extra wire on the 1J1 plug for the fuel injectors; I just jumpered it into a switched source (B-1, Pin 17[black-orange], if I remember correctly) and that solved the injector problem. I also found an extra black-white wire (IJ1, Pin 3) that needed a switched source for the ignition coils. As far as I can tell, those were the only extra changes that had to be done for my '96 1UZ. However, I've done the changes and wired in the CEL and I see that the CEL does not turn on when the key is in the on position, and I'm getting no spark although the Coils and Igniters are showing 12 volts. Do you remember any other changes you had to make? Perhaps some extra grounds?
 

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#20
No extra grounds that I'm aware of. In the dash, is your Black-Orange wire from pin 16 on B-1 connected to the Black-Orange wire from pin 11 on IJ2? That wire comes from your ignition switch, when its tuned to the on position it tells the ECU to kick the EFI-Main relay on, without it the engine will not run. Pre-96 1UZ igniter and fuel injectors get their power from EB2 in the engine bay. 96 and up igniter and fuel injectors get there power from IJ1 at pin 3 and pin 7 both Black-White color, in the dash.
 

CheesePhantom

New Member
Authorized Seller
Joined
Mar 26, 2011
Messages
18
Likes
0
Location
Tampa, FL
#21
No extra grounds that I'm aware of. In the dash, is your Black-Orange wire from pin 16 on B-1 connected to the Black-Orange wire from pin 11 on IJ2? That wire comes from your ignition switch, when its tuned to the on position it tells the ECU to kick the EFI-Main relay on, without it the engine will not run. Pre-96 1UZ igniter and fuel injectors get their power from EB2 in the engine bay. 96 and up igniter and fuel injectors get there power from IJ1 at pin 3 and pin 7 both Black-White color, in the dash.
Yup. I made a patch harness between the two, using 7M Harness connectors and SC400 body connectors.



I have like five wires connected to the Black-Orange wire, including:
- The fuel pump, which I've wired into a separate 30A relay; utilizing the 12 volt mod.

- The Black-Orange wire from IJ1
- Both Black-White wires from IJ1
- The yellow fuel pump relay wire from B-1, which has become obsolete

I've also made patch harnesses to merge EB1 and EB2 into the MA70 body harness/Fuse box.




I'm at a loss, man. I've looked over my wiring a million times and I can't find a reason why the ECU isn't kicking on. I could understand if the EFI Relay went bad, since the car sat for three years, but wouldn't the ECU still turn on (CEL at on position) with a bad EFI Relay?
 

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#22
Looks like you did a nice job on your swap harness. If the EFI main relay does not kick on then the ECU will not see any power. Pull the relay and test it. I had an 89 that wouldn't kick the EFI main relay turns out the ignition switch went bad, one of the terminals corroded and fell apart. That caused the 7.5a IGN fuse to blow, witch ultimately kept the ECU from getting power. Something to consider. Right now I suggest looking over your engine bay wiring.
 

CheesePhantom

New Member
Authorized Seller
Joined
Mar 26, 2011
Messages
18
Likes
0
Location
Tampa, FL
#23
Looks like you did a nice job on your swap harness. If the EFI main relay does not kick on then the ECU will not see any power. Pull the relay and test it. I had an 89 that wouldn't kick the EFI main relay turns out the ignition switch went bad, one of the terminals corroded and fell apart. That caused the 7.5a IGN fuse to blow, witch ultimately kept the ECU from getting power. Something to consider. Right now I suggest looking over your engine bay wiring.
Thanks a lot, man; for the compliment and for the advice. I will test the EFI Relay and take a closer look at my engine bay wiring as soon as possible.
 

White Zombie

New Member
Authorized Seller
Joined
Feb 1, 2007
Messages
272
Likes
0
Location
Hampton , VA
#27
in your earlier post you were asking if the diagram had wiring for a cold start injector . I thought that was only on the pre 92 models, aka the LS400 ? Im buying a 1990 ewd for a 1990 ls400 . Only because that happens to be the Ecu and wire harness i currently have.

im still using a sc motor/ oil pan and all, just dont have the wiring ecu for it .
 

4U2QUIK

1UZFE SWAP DUDE!!!
Authorized Seller
Contributor
Joined
Sep 7, 2007
Messages
798
Likes
0
Location
Salida, California, United States
#32
It's a huge difference and you're basically setting yourself up to do tons more wiring to get it to work with the supra chasis.
also you would still need the sc400 oil pan and pickup which are harder to find than an entire engine.
 

SupraPieces

New Member
Authorized Seller
Joined
Nov 23, 2011
Messages
157
Likes
0
Location
New Jersey
#33
Is there a drawing of how to wire the fuse box connectors or is that on the first page? My 1UZ came with a cut harness and no ECU so I have to do a lot of detective work to figure out what year my motor is and which plugs and ecu I need... anyone have any tell-ale info for me to verify what year mine is?

I will post some pictures if needed
 

SupraPieces

New Member
Authorized Seller
Joined
Nov 23, 2011
Messages
157
Likes
0
Location
New Jersey
#35
Can anyone tell me which ECU and PLUGS I should be pulling at a junkyard? My plan is to find one in a yard and cut the harness and take the plugs and ecu...

20130425_165359.jpg 20130425_165407.jpg 20130425_165445.jpg 20130425_165502.jpg 20130425_165510.jpg 20130425_165541.jpg 20130425_165551.jpg
 

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#36
On the SC harness the plugs are the same 92-97, after that it gets a little fuzzy. I havent dealt with anything newer than the 97 EWD book and an actual 96 harness.

You will need dash plugs (5 total; 4 needed) IJ1, IJ2, IK1, IK2, and II1 if you want to control your heater valve. In the SC they are a PITA to get to/out but its possible withoud removing the dash. In the engine bay you only really need EB1 and EB2, In the SC its located on the front of the fuse box.

The diagram at the bottom of the first post shows the EFI wiring layout in the engine bay (fuse box), the starter goes through EB1 but its not on that schematic.
 

Chambers

Now you know
Authorized Seller
Contributor
Joined
Sep 9, 2007
Messages
981
Likes
0
Location
Baltimore County, Maryland
#37
Just added a new wiring diagram to post 1:

1987 Supra to 1993 LS400 1UZ-FE (This diagram is subject to change, since I have not done a LS400 1UZ-FE swap yet it may change as others give me input)