Installation of an Adaptronic ECU for a 1UZFE
 

Article By: Eric Hamacher

Although documentation exists for installation for a Toyota Soarer (SC400), there are none specifically for a LS400 (Celsior) motor.  My particular application does not require retaining the OEM ECU; however if yours does, I recommend following the directions for the Soarer installation when referring to the section titled “Fooling the Factory ECU to eliminate fault code generation”.  Specifically the ignition and air flow directions.

The early LS400 wiring harness contains 4 plugs that connect to the OEM ECU.  According to the 1992 LS400 Electrical Wiring Diagram, these are referred to plugs A, B, C, and D.

Only some of these wires are actually needed to connect to the four plugs for the Adaptronic.

What we are looking for in the original LS400 wiring diagram are for these sensors, inputs, and outputs that are required for operation.  Here is each LS400 plug individually.

LS400 Plug A

PLUG

PIN

FUNCTION

COLOR

ADAPTRONIC

Standalone

Piggyback

 

 

1

IGSW

Black/Orange

 

 

 

 

2

STA

Black

 

 

 

 

3

NOT USED

4

VTA1 - TPS

Yellow

20 pin

10

Pin swap

Tap

5

THW - Water temp

Red/Blue

20 pin

17

Pin swap

Pin swap

6

OXL1

Black

 

 

 

 

7

EGR Temp

Red/Green

 

 

 

 

8

KS

Yellow/Green

 

 

 

 

9

T1 - TE1

Red/Black

 

 

 

 

10

NOT USED

11

VC

Blue/Red

20 pin

19

Connect

Connect

12

B+

Black/Red

8 pin

1

Pin swap

Tap

13

B1+

Black/Red

 

 

 

 

14

NSW

Black/White

 

 

 

 

15

NOT USED

16

THA

Yellow/Black

 

 

 

 

17

OXR1

Black/White

 

 

 

 

18

E2

Brown

20 pin

20

Pin swap

Pin swap

19

SPD

Violet/White

 

 

 

 

20

T2 - TE2

Red/White

 

 

 

 

21

NOT USED

22

E1

Brown

8 pin

4

Connect

Tap

 

Of the pins listed above, the following use the same pin type and can be swapped as seen below.

VTA1 (TPS signal)                             Water temp signal

B+ (+12V Ignition)                             E1 (Gnd)

E2 (TPS Gnd) and VC (TPS +5V) do not have the same pins and must be wired conventionally by soldering or so other means of secure connection.

 Some of the other plugs utilize the same pins as well and may allow for pin swapping.  Others must be direct connected due to the larger pin.  If you choose to piggyback with the OEM ECU because of your application, you will want to tap some of the connections instead of swapping the pins.  This is noted in the Standalone/Piggyback columns.   

Please keep in mind this is only a recommendation.  Take the time to review the wiring diagrams for your specific application.


LS400 Plug B

PLUG

PIN

FUNCTION

COLOR

ADAPTRONIC

Standalone

Piggyback

 

 

 

1

NOT USED

2

NOT USED

3

NOT USED

4

MREL

Black/Orange

 

 

 

 

5

W-Check Engine

Yellow/Red

 

 

 

 

6

FPR

Green/Red

 

 

 

 

7

ACMG

White

20 pin

14

Pin swap

Tap

8

FC

Green/Black

 

 

 

 

9

NOT USED

10

NOT USED

11

OXR2

Yellow

 

 

 

 

12

NOT USED

13

NOT USED

14

 

 

 

 

 

 

15

NOT USED

16

NOT USED

17

NOT USED

18

NOT USED

19

BK - Stoplight

Green/White

 

 

 

 

20

KD

Green/Yellow

 

 

 

 

21

NOT USED

22

NOT USED

23

AC

Black

 

 

 

 

24

OXL2

Green

 

 

 

 

25

NOT USED

26

Batt

Black/Yellow

 

 

 

 

 

LS400 Plug C

PLUG

PIN

FUNCTION

COLOR

ADAPTRONIC

Standalone

Piggyback

 

1

IDL

Green

Optional / Not documented

2

IGF 1

Yellow/Green

 

 

 

 

3

KNK 1

Black

20 pin

15

Pin swap

 

4

VF 1

Grey

 

 

 

 

5

IGT 1

Black/White

16 pin

2

Pin swap

Pin swap

6

G2+

Green

16 pin

10

Pin swap

Tap

7

G1+

Black

16 pin

3

Pin swap

Tap

8

NE+

Yellow

16 pin

11

Pin swap

Tap

9

NOT USED

10

IGF 2

Yellow/Black

 

 

 

 

11

KNK 2

Grey

 

 

 

 

12

VF 2

Blue/Red

 

 

 

 

13

IGT 2

Brown/Yellow

16 pin

9

Pin swap

Pin swap

14

NOT USED

15

G-

White

 

 

 

 

16

NE-

Red

16 pin

4

Pin swap

Pin swap

On Plug C, the IDL pin can optionally be used as one of the eight Dig in’s.  Also the G- and NE- are connected together in the harness, only one needs to connect to the Adaptronic, remove the other completely or wire G- and NE- together.

Also note the IGT’s.  If using as a piggyback, see Soarer install directions.

LS400 Plug D

PLUG

PIN

FUNCTION

COLOR

ADAPTRONIC

Standalone

Piggyback

 

 

 

1

NOT USED

2

NOT USED

3

NOT USED

4

STJ

Black/Red

 

 

 

 

5

ISC 4

Blue/White

16 pin

15

Pin swap

Pin swap

6

ISC 3

Green/Yellow

16 pin

16

Pin swap

Pin swap

7

ISC 2

Yellow/Red

16 pin

8

Pin swap

Pin swap

8

ISC 1

Green

16 pin

7

Pin swap

Pin swap

9

NOT USED

10

NOT USED

11

#20 - Inj 2/8

Black/Yellow

8 pin

8

Connect

Connect

12

#10 - Inj 1/7

Yellow

8 pin

7

Connect

Connect

13

E01 - Ground

White/Black

8 pin

3

Connect

Tap

14

NOT USED

15

NOT USED

16

NOT USED

17

STJ1

Black/Red

 

 

 

 

18

NOT USED

19

HT2 - O2 Heat #2

Yellow

 

 

 

 

20

HT1 - O2 Heat #1

Red

 

 

 

 

21

EGR Solenoid

Green/Red

 

 

 

 

22

PR - Pressure up

Yellow/Black

 

 

 

 

23

NOT USED

24

#40 - Inj 3/5

Blue

8 pin

6

Connect

Connect

25

#30 - Inj 4/6

Red

8 pin

5

Connect

Connect

26

E02 - Ground

White/Black

8 pin

2

Connect

Tap

For simplicity, I chose to use a standard GM IAT sensor and a standard GM 1 bar MAP sensor.  Their installation is also very easy. 

For simplicity, I chose to use a standard GM IAT sensor and a standard GM 1 bar MAP sensor since both are cheap and easy to find.  Their installation is also very easy.  Based on the sensor resistance, I created values for the air temp calibration.  Not exact, but works pretty well.

For the Water temp sensor, I kept the OEM sensor and calibrated it to match.  I also used sensor resistance to match up values and this has work pretty well so far.

Air Temperature

Both of the temperature sensor calibrations are approximates and may need some adjustment based on your application

Water Temperature

 

Adaptronic Plugs

        

 

Update: For all 1UZFE owners, you have to install this specific UZFE Data into the Adaptronic before the ecu can work.

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Lex.