Lexus SC400 1992-97 (1UZ-FE non-VVTi) → DTAFast P8 (auto)

Lexus SC400 1992-97 (1UZ-FE non-VVTi) — DTAFast — P8

⚠ NOT CHECKED. Don't build from this.

Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12

Before you start

Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.

Status	draft · not yet verified: nobody has reported building and running this harness
Open errors	1: read the Findings page before cutting any wire
Size of the job	53 wires · 8 connectors · 0 part lines
Tools	Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Order of work	1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up.

Build checklist

Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.

Wire	From	To	Gauge	Cut	Label	Crimp A	Crimp B	Pin A	Pin B	Continuity
W1	OEM-A-12	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W2	OEM-A-13	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W3	SP-14V-1	P8-C1-19	0.85	☐	☐	☐	☐	☐	☐	☐
W4	OEM-A-22	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W5	OEM-D-13	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W6	OEM-D-26	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W7	SP-GND-1	P8-C1-15	0.85	☐	☐	☐	☐	☐	☐	☐
W8	SP-GND-1	P8-C1-34	0.85	☐	☐	☐	☐	☐	☐	☐
W9	SP-GND-1	P8-C1-55	0.85	☐	☐	☐	☐	☐	☐	☐
W10	OEM-A-18	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W11	OEM-C-15	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W12	OEM-C-16	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W13	SP-0V-1	P8-C1-46	0.5	☐	☐	☐	☐	☐	☐	☐
W14	SP-0V-1	P8-C1-47	0.5	☐	☐	☐	☐	☐	☐	☐
W15	SP-0V-1	P8-C1-49	0.5	☐	☐	☐	☐	☐	☐	☐
W16	SP-0V-1	P8-C1-51	0.5	☐	☐	☐	☐	☐	☐	☐
W17	OEM-A-11	P8-C1-10	0.5	☐	☐	☐	☐	☐	☐	☐
W18	OEM-C-8	P8-C1-8	0.5	☐	☐	☐	☐	☐	☐	☐
W19	OEM-C-7	P8-C1-27	0.5	☐	☐	☐	☐	☐	☐	☐
W20	OEM-C-6	P8-C1-29	0.5	☐	☐	☐	☐	☐	☐	☐
W21	OEM-C-5	P8-C1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W22	OEM-C-13	P8-C1-38	0.5	☐	☐	☐	☐	☐	☐	☐
W23	OEM-D-12	P8-C1-37	0.5	☐	☐	☐	☐	☐	☐	☐
W24	OEM-D-11	P8-C1-18	0.5	☐	☐	☐	☐	☐	☐	☐
W25	OEM-D-24	P8-C1-54	0.5	☐	☐	☐	☐	☐	☐	☐
W26	OEM-D-25	P8-C1-36	0.5	☐	☐	☐	☐	☐	☐	☐
W27	OEM-A-4	P8-C1-48	0.5	☐	☐	☐	☐	☐	☐	☐
W28	OEM-A-5	P8-C1-26	0.5	☐	☐	☐	☐	☐	☐	☐
W29	OEM-B-4	P8-C1-41	0.5	☐	☐	☐	☐	☐	☐	☐
W30	OEM-B-6	P8-C1-5	0.5	☐	☐	☐	☐	☐	☐	☐
W31	OEM-B-7	P8-C1-43	0.5	☐	☐	☐	☐	☐	☐	☐
W32	OEM-D-19	P8-C1-42	0.5	☐	☐	☐	☐	☐	☐	☐
W33	OEM-D-20	P8-C1-21	0.5	☐	☐	☐	☐	☐	☐	☐
W34	OEM-D-17	P8-C1-23	0.5	☐	☐	☐	☐	☐	☐	☐
W35	OEM-D-8	P8-C1-4	0.5	☐	☐	☐	☐	☐	☐	☐
W36	OEM-D-7	P8-C1-6	0.5	☐	☐	☐	☐	☐	☐	☐
W37	OEM-D-6	P8-C1-17	0.5	☐	☐	☐	☐	☐	☐	☐
W38	OEM-D-5	P8-C1-35	0.5	☐	☐	☐	☐	☐	☐	☐
W39	OEM-B-5	P8-C1-53	0.5	☐	☐	☐	☐	☐	☐	☐
W40	OEM-B-8	P8-C1-16	0.5	☐	☐	☐	☐	☐	☐	☐
W41	OEM-A-17	P8-C1-12	0.5	☐	☐	☐	☐	☐	☐	☐
W42	OEM-A-6	P8-C1-25	0.5	☐	☐	☐	☐	☐	☐	☐
W43	OEM-B-11	P8-C1-7	0.5	☐	☐	☐	☐	☐	☐	☐
W44	OEM-B-24	P8-C1-44	0.5	☐	☐	☐	☐	☐	☐	☐
W45	OEM-A-16	P8-C1-45	0.5	☐	☐	☐	☐	☐	☐	☐
W46	OEM-C-2	P8-C1-11	0.5	☐	☐	☐	☐	☐	☐	☐
W47	OEM-C-10	P8-C1-50	0.5	☐	☐	☐	☐	☐	☐	☐
W48	OEM-A-19	P8-C1-9	0.5	☐	☐	☐	☐	☐	☐	☐
W49	OEM-A-9	P8-C1-13	0.5	☐	☐	☐	☐	☐	☐	☐
W50	OEM-A-20	P8-C1-14	0.5	☐	☐	☐	☐	☐	☐	☐
W51	OEM-A-14	P8-C1-31	0.5	☐	☐	☐	☐	☐	☐	☐
W52	OEM-A-2	P8-C1-32	0.5	☐	☐	☐	☐	☐	☐	☐
W53	OEM-B-19	P8-C1-33	0.5	☐	☐	☐	☐	☐	☐	☐

Bench test (before first power-up)

Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).

#	Probe A	Probe B	Expect	Why
1	P8-C1-10	P8-C1-15	open (OL)	5 V sensor reference must not touch power ground
2	P8-C1-10	P8-C1-46	open (OL)	5 V sensor reference must not touch sensor ground
3	P8-C1-19	P8-C1-15	open (OL)	+12 V supply must not touch power ground
4	P8-C1-19	P8-C1-46	open (OL)	+12 V supply must not touch sensor ground
5	P8-C1-10	P8-C1-19	open (OL)	5 V sensor reference must not touch +12 V supply

If any reading doesn't match, stop and get help before powering up.

Revisions

Rev	Label	By	Date
No revisions yet.

Schematic

Connectors

OEM-A

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Ignition switch (IGSW)	—	—	—	—	—	—	—	—
11	Sensor supply +5V (VC)	—	W17	—	0.5	P8-C1-10	—	—	—
12	EFI main relay (B+)	—	W1	—	0.85	SP-14V-1	—	—	—
13	EFI main relay (B1+)	—	W2	—	0.85	SP-14V-1	—	—	—
14	Neutral start switch (NSW)	—	W51	—	0.5	P8-C1-31	—	—	—
16	Intake air temperature (THA)	—	W45	—	0.5	P8-C1-45	—	—	—
17	O2 right front (OXR1)	—	W41	—	0.5	P8-C1-12	—	—	—
18	Sensor ground (E2)	—	W10	—	0.5	SP-0V-1	—	—	—
19	Vehicle speed (SPD)	—	W48	—	0.5	P8-C1-9	—	—	—
2	Starter signal (STA)	—	W52	—	0.5	P8-C1-32	—	—	—
20	Diagnostic test 2 (TE2)	—	W50	—	0.5	P8-C1-14	—	—	—
22	Power ground (E1)	—	W4	—	0.85	SP-GND-1	—	—	—
4	Throttle position (VTA1)	—	W27	—	0.5	P8-C1-48	—	—	—
5	Coolant temperature (THW)	—	W28	—	0.5	P8-C1-26	—	—	—
6	O2 left front (OXL1)	—	W42	—	0.5	P8-C1-25	—	—	—
7	EGR temperature sensor	—	—	—	—	—	—	—	—
8	Knock/shield (KS)	—	—	—	—	—	—	—	—
9	Diagnostic test 1 (TE1)	—	W49	—	0.5	P8-C1-13	—	—	—

OEM-B

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
11	O2 right rear (OXR2)	—	W43	—	0.5	P8-C1-7	—	—	—
19	Stop light switch (BK)	—	W53	—	0.5	P8-C1-33	—	—	—
20	A/T kickdown switch (KD)	—	—	—	—	—	—	—	—
23	A/C request (AC)	—	—	—	—	—	—	—	—
24	O2 left rear (OXL2)	—	W44	—	0.5	P8-C1-44	—	—	—
26	Battery constant (BATT)	—	—	—	—	—	—	—	—
4	EFI main relay control (MREL)	—	W29	—	0.5	P8-C1-41	—	—	—
5	Check-engine lamp (W)	—	W39	—	0.5	P8-C1-53	—	—	—
6	Fuel pump relay (FPR)	—	W30	—	0.5	P8-C1-5	—	—	—
7	A/C clutch relay (ACMG)	—	W31	—	0.5	P8-C1-43	—	—	—
8	Fuel pump control (FC)	—	W40	—	0.5	P8-C1-16	—	—	—

OEM-C

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	TPS idle switch (IDL)	—	—	—	—	—	—	—	—
10	Igniter 2 feedback (IGF2)	—	W47	—	0.5	P8-C1-50	—	—	—
11	Knock sensor 2 (KNK2)	—	—	—	—	—	—	—	—
12	Check connector VF2	—	—	—	—	—	—	—	—
13	Ignition 2 (IGT2)	—	W22	—	0.5	P8-C1-38	—	—	—
15	Cam sensor ground (G-)	—	W11	—	0.5	SP-0V-1	—	—	—
16	Crank sensor - (NE-)	—	W12	—	0.5	SP-0V-1	—	—	—
2	Igniter 1 feedback (IGF1)	—	W46	—	0.5	P8-C1-11	—	—	—
3	Knock sensor 1 (KNK1)	—	—	—	—	—	—	—	—
4	Check connector VF1	—	—	—	—	—	—	—	—
5	Ignition 1 (IGT1)	—	W21	—	0.5	P8-C1-1	—	—	—
6	Cam sensor 2 + (G2+)	—	W20	—	0.5	P8-C1-29	—	—	—
7	Cam sensor 1 + (G1+)	—	W19	—	0.5	P8-C1-27	—	—	—
8	Crank sensor + (NE+)	—	W18	—	0.5	P8-C1-8	—	—	—

OEM-D

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
11	Injector 2&8 (#20)	—	W24	—	0.5	P8-C1-18	—	—	—
12	Injector 1&7 (#10)	—	W23	—	0.5	P8-C1-37	—	—	—
13	Power ground (E01)	—	W5	—	0.85	SP-GND-1	—	—	—
17	Cold start injector 1 (STJ1)	—	W34	—	0.5	P8-C1-23	—	—	—
19	O2 heater 2 (HT2)	—	W32	—	0.5	P8-C1-42	—	—	—
20	O2 heater 1 (HT1)	—	W33	—	0.5	P8-C1-21	—	—	—
21	EGR solenoid	—	—	—	—	—	—	—	—
22	Fuel pressure-up VSV (PR)	—	—	—	—	—	—	—	—
24	Injector 3&5 (#40)	—	W25	—	0.5	P8-C1-54	—	—	—
25	Injector 4&6 (#30)	—	W26	—	0.5	P8-C1-36	—	—	—
26	Power ground (E02)	—	W6	—	0.85	SP-GND-1	—	—	—
4	Cold start injector (STJ)	—	—	—	—	—	—	—	—
5	ISC stepper coil 4 (ISC4)	—	W38	—	0.5	P8-C1-35	—	—	—
6	ISC stepper coil 3 (ISC3)	—	W37	—	0.5	P8-C1-17	—	—	—
7	ISC stepper coil 2 (ISC2)	—	W36	—	0.5	P8-C1-6	—	—	—
8	ISC stepper coil 1 (ISC1)	—	W35	—	0.5	P8-C1-4	—	—	—

P8-C1

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Coil 1	—	W21	—	0.5	OEM-C-5	—	—	—
10	5 Volts	—	W17	—	0.5	OEM-A-11	—	—	—
11	Undriven Wheel (must)	—	W46	—	0.5	OEM-C-2	—	—	—
12	Lambda Signal	—	W41	—	0.5	OEM-A-17	—	—	—
13	Map2/ALS/Ana1 On/Off	—	W49	—	0.5	OEM-A-9	—	—	—
14	Traction Wet/Dry	—	W50	—	0.5	OEM-A-20	—	—	—
15	Power Ground	—	W7	—	0.85	SP-GND-1	—	—	—
16	Injector 8	—	W40	—	0.5	OEM-B-8	—	—	—
17	Injector 5	—	W37	—	0.5	OEM-D-6	—	—	—
18	Injector 2	—	W24	—	0.5	OEM-D-11	—	—	—
19	12 Volts	—	W3	—	0.85	SP-14V-1	—	—	—
2	Coil 4	—	—	—	—	—	—	—	—
20	Coil 3	—	—	—	—	—	—	—	—
21	Turbo Pressure Valve	—	W33	—	0.5	OEM-D-20	—	—	—
22	Coil 8/or Aux5	—	—	—	—	—	—	—	—
23	Turbo ALS Valve	—	W34	—	0.5	OEM-D-17	—	—	—
24	Tacho	—	—	—	—	—	—	—	—
25	Analogue Input 1	—	W42	—	0.5	OEM-A-6	—	—	—
26	Water Temp	—	W28	—	0.5	OEM-A-5	—	—	—
27	Cam Sensor	—	W19	—	0.5	OEM-C-7	—	—	—
28	5 Volts	—	—	—	—	—	—	—	—
29	Left Driven Wheel	—	W20	—	0.5	OEM-C-6	—	—	—
3	Coil 6	—	—	—	—	—	—	—	—
30	Map	—	—	—	—	—	—	—	—
31	Launch Button	—	W51	—	0.5	OEM-A-14	—	—	—
32	Traction On/Off	—	W52	—	0.5	OEM-A-2	—	—	—
33	Shift Cut	—	W53	—	0.5	OEM-B-19	—	—	—
34	Power Ground	—	W8	—	0.85	SP-GND-1	—	—	—
35	Injector 6	—	W38	—	0.5	OEM-D-5	—	—	—
36	Injector 4	—	W26	—	0.5	OEM-D-25	—	—	—
37	Injector 1	—	W23	—	0.5	OEM-D-12	—	—	—
38	Coil 2	—	W22	—	0.5	OEM-C-13	—	—	—
39	Coil 5	—	—	—	—	—	—	—	—
4	Idle Valve	—	W35	—	0.5	OEM-D-8	—	—	—
40	Coil 7	—	—	—	—	—	—	—	—
41	Fuel Pump Relay	—	W29	—	0.5	OEM-B-4	—	—	—
42	Cam Phase Valve/Aux Out 4	—	W32	—	0.5	OEM-D-19	—	—	—
43	Aux Out 3	—	W31	—	0.5	OEM-B-7	—	—	—
44	Analogue Input 3	—	W44	—	0.5	OEM-B-24	—	—	—
45	Air Temp	—	W45	—	0.5	OEM-A-16	—	—	—
46	Signal Ground	—	W13	—	0.5	SP-0V-1	—	—	—
47	Signal Ground	—	W14	—	0.5	SP-0V-1	—	—	—
48	Throttle Wiper	—	W27	—	0.5	OEM-A-4	—	—	—
49	Lambda Earth	—	W15	—	0.5	SP-0V-1	—	—	—
5	Aux Out 2	—	W30	—	0.5	OEM-B-6	—	—	—
50	Undriven Wheel (optional)	—	W47	—	0.5	OEM-C-10	—	—	—
51	Signal Ground	—	W16	—	0.5	SP-0V-1	—	—	—
52	5 Volts	—	—	—	—	—	—	—	—
53	Injector 7	—	W39	—	0.5	OEM-B-5	—	—	—
54	Injector 3	—	W25	—	0.5	OEM-D-24	—	—	—
55	Power Ground	—	W9	—	0.85	SP-GND-1	—	—	—
6	Shift Light	—	W36	—	0.5	OEM-D-7	—	—	—
7	Analogue Input 2 Or Log Switch	—	W43	—	0.5	OEM-B-11	—	—	—
8	Crank Sensor	—	W18	—	0.5	OEM-C-8	—	—	—
9	Right Driven Wheel	—	W48	—	0.5	OEM-A-19	—	—	—

SP-0V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W10	—	0.5	OEM-A-18	—	—	—
1	—	—	W11	—	0.5	OEM-C-15	—	—	—
1	—	—	W12	—	0.5	OEM-C-16	—	—	—
1	—	—	W13	—	0.5	P8-C1-46	—	—	—
1	—	—	W14	—	0.5	P8-C1-47	—	—	—
1	—	—	W15	—	0.5	P8-C1-49	—	—	—
1	—	—	W16	—	0.5	P8-C1-51	—	—	—

SP-14V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W1	—	0.85	OEM-A-12	—	—	—
1	—	—	W2	—	0.85	OEM-A-13	—	—	—
1	—	—	W3	—	0.85	P8-C1-19	—	—	—

SP-GND

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W4	—	0.85	OEM-A-22	—	—	—
1	—	—	W5	—	0.85	OEM-D-13	—	—	—
1	—	—	W6	—	0.85	OEM-D-26	—	—	—
1	—	—	W7	—	0.85	P8-C1-15	—	—	—
1	—	—	W8	—	0.85	P8-C1-34	—	—	—
1	—	—	W9	—	0.85	P8-C1-55	—	—	—

Pin map

OEM point	OEM function	OEM family	Target point	Target function	Target family	Evidence
OEM-A-1	Ignition switch (IGSW)	digital_in	—	—	—	single_source
OEM-A-11	Sensor supply +5V (VC)	vref	P8-C1-10	5 Volts	vref	single_source
OEM-A-12	EFI main relay (B+)	power_in	P8-C1-19	12 Volts	power_in	single_source
OEM-A-13	EFI main relay (B1+)	power_in	P8-C1-19	12 Volts	power_in	single_source
OEM-A-14	Neutral start switch (NSW)	digital_in	P8-C1-31	Launch Button	digital_in	single_source
OEM-A-16	Intake air temperature (THA)	temp_in	P8-C1-45	Air Temp	temp_in	single_source
OEM-A-17	O2 right front (OXR1)	lambda_nb_in	P8-C1-12	Lambda Signal	lambda_nb_in	single_source
OEM-A-18	Sensor ground (E2)	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-A-19	Vehicle speed (SPD)	digital_in	P8-C1-9	Right Driven Wheel	digital_in	single_source
OEM-A-2	Starter signal (STA)	digital_in	P8-C1-32	Traction On/Off	digital_in	single_source
OEM-A-20	Diagnostic test 2 (TE2)	digital_in	P8-C1-14	Traction Wet/Dry	digital_in	single_source
OEM-A-22	Power ground (E1)	ground	P8-C1-15 + P8-C1-34 + P8-C1-55	Power Ground + Power Ground + Power Ground	ground	single_source
OEM-A-4	Throttle position (VTA1)	analog_in	P8-C1-48	Throttle Wiper	analog_in	single_source
OEM-A-5	Coolant temperature (THW)	temp_in	P8-C1-26	Water Temp	temp_in	single_source
OEM-A-6	O2 left front (OXL1)	lambda_nb_in	P8-C1-25	Analogue Input 1	analog_in	single_source
OEM-A-7	EGR temperature sensor	temp_in	—	—	—	single_source
OEM-A-8	Knock/shield (KS)	knock_in	—	—	—	single_source
OEM-A-9	Diagnostic test 1 (TE1)	digital_in	P8-C1-13	Map2/ALS/Ana1 On/Off	digital_in	single_source
OEM-B-11	O2 right rear (OXR2)	lambda_nb_in	P8-C1-7	Analogue Input 2 Or Log Switch	analog_in	single_source
OEM-B-19	Stop light switch (BK)	digital_in	P8-C1-33	Shift Cut	digital_in	single_source
OEM-B-20	A/T kickdown switch (KD)	digital_in	—	—	—	single_source
OEM-B-23	A/C request (AC)	digital_in	—	—	—	single_source
OEM-B-24	O2 left rear (OXL2)	lambda_nb_in	P8-C1-44	Analogue Input 3	analog_in	single_source
OEM-B-26	Battery constant (BATT)	power_in	—	—	—	single_source
OEM-B-4	EFI main relay control (MREL)	low_side_out	P8-C1-41	Fuel Pump Relay	low_side_out	single_source
OEM-B-5	Check-engine lamp (W)	low_side_out	P8-C1-53	Injector 7	injector_out	single_source
OEM-B-6	Fuel pump relay (FPR)	low_side_out	P8-C1-5	Aux Out 2	low_side_out	single_source
OEM-B-7	A/C clutch relay (ACMG)	low_side_out	P8-C1-43	Aux Out 3	low_side_out	single_source
OEM-B-8	Fuel pump control (FC)	low_side_out	P8-C1-16	Injector 8	injector_out	single_source
OEM-C-1	TPS idle switch (IDL)	digital_in	—	—	—	single_source
OEM-C-10	Igniter 2 feedback (IGF2)	digital_in	P8-C1-50	Undriven Wheel (optional)	digital_in	single_source
OEM-C-11	Knock sensor 2 (KNK2)	knock_in	—	—	—	single_source
OEM-C-12	Check connector VF2	analog_out	—	—	—	single_source
OEM-C-13	Ignition 2 (IGT2)	ignition_out	P8-C1-38	Coil 2	ignition_out	single_source
OEM-C-15	Cam sensor ground (G-)	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-C-16	Crank sensor - (NE-)	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-C-2	Igniter 1 feedback (IGF1)	digital_in	P8-C1-11	Undriven Wheel (must)	digital_in	single_source
OEM-C-3	Knock sensor 1 (KNK1)	knock_in	—	—	—	single_source
OEM-C-4	Check connector VF1	analog_out	—	—	—	single_source
OEM-C-5	Ignition 1 (IGT1)	ignition_out	P8-C1-1	Coil 1	ignition_out	single_source
OEM-C-6	Cam sensor 2 + (G2+)	trigger_in	P8-C1-29	Left Driven Wheel	digital_in	single_source
OEM-C-7	Cam sensor 1 + (G1+)	trigger_in	P8-C1-27	Cam Sensor	trigger_in	single_source
OEM-C-8	Crank sensor + (NE+)	trigger_in	P8-C1-8	Crank Sensor	trigger_in	single_source
OEM-D-11	Injector 2&8 (#20)	injector_out	P8-C1-18	Injector 2	injector_out	single_source
OEM-D-12	Injector 1&7 (#10)	injector_out	P8-C1-37	Injector 1	injector_out	single_source
OEM-D-13	Power ground (E01)	ground	P8-C1-15 + P8-C1-34 + P8-C1-55	Power Ground + Power Ground + Power Ground	ground	single_source
OEM-D-17	Cold start injector 1 (STJ1)	low_side_out	P8-C1-23	Turbo ALS Valve	low_side_out	single_source
OEM-D-19	O2 heater 2 (HT2)	low_side_out	P8-C1-42	Cam Phase Valve/Aux Out 4	low_side_out	single_source
OEM-D-20	O2 heater 1 (HT1)	low_side_out	P8-C1-21	Turbo Pressure Valve	low_side_out	single_source
OEM-D-21	EGR solenoid	low_side_out	—	—	—	single_source
OEM-D-22	Fuel pressure-up VSV (PR)	low_side_out	—	—	—	single_source
OEM-D-24	Injector 3&5 (#40)	injector_out	P8-C1-54	Injector 3	injector_out	single_source
OEM-D-25	Injector 4&6 (#30)	injector_out	P8-C1-36	Injector 4	injector_out	single_source
OEM-D-26	Power ground (E02)	ground	P8-C1-15 + P8-C1-34 + P8-C1-55	Power Ground + Power Ground + Power Ground	ground	single_source
OEM-D-4	Cold start injector (STJ)	low_side_out	—	—	—	single_source
OEM-D-5	ISC stepper coil 4 (ISC4)	low_side_out	P8-C1-35	Injector 6	injector_out	single_source
OEM-D-6	ISC stepper coil 3 (ISC3)	low_side_out	P8-C1-17	Injector 5	injector_out	single_source
OEM-D-7	ISC stepper coil 2 (ISC2)	low_side_out	P8-C1-6	Shift Light	low_side_out	single_source
OEM-D-8	ISC stepper coil 1 (ISC1)	low_side_out	P8-C1-4	Idle Valve	low_side_out	single_source

Cut list

Wire	From	To	Gauge (mm²)	Length	Signal	Ident
W1	OEM-A-12	SP-14V-1	0.85	no route	EFI main relay (B+)	—
W2	OEM-A-13	SP-14V-1	0.85	no route	EFI main relay (B1+)	—
W3	SP-14V-1	P8-C1-19	0.85	no route	12 Volts	—
W4	OEM-A-22	SP-GND-1	0.85	no route	Power ground (E1)	—
W5	OEM-D-13	SP-GND-1	0.85	no route	Power ground (E01)	—
W6	OEM-D-26	SP-GND-1	0.85	no route	Power ground (E02)	—
W7	SP-GND-1	P8-C1-15	0.85	no route	Power Ground	—
W8	SP-GND-1	P8-C1-34	0.85	no route	Power Ground	—
W9	SP-GND-1	P8-C1-55	0.85	no route	Power Ground	—
W10	OEM-A-18	SP-0V-1	0.5	no route	Sensor ground (E2)	—
W11	OEM-C-15	SP-0V-1	0.5	no route	Cam sensor ground (G-)	—
W12	OEM-C-16	SP-0V-1	0.5	no route	Crank sensor - (NE-)	—
W13	SP-0V-1	P8-C1-46	0.5	no route	Signal Ground	—
W14	SP-0V-1	P8-C1-47	0.5	no route	Signal Ground	—
W15	SP-0V-1	P8-C1-49	0.5	no route	Lambda Earth	—
W16	SP-0V-1	P8-C1-51	0.5	no route	Signal Ground	—
W17	OEM-A-11	P8-C1-10	0.5	no route	Sensor supply +5V (VC)	—
W18	OEM-C-8	P8-C1-8	0.5	no route	Crank sensor + (NE+)	—
W19	OEM-C-7	P8-C1-27	0.5	no route	Cam sensor 1 + (G1+)	—
W20	OEM-C-6	P8-C1-29	0.5	no route	Cam sensor 2 + (G2+)	—
W21	OEM-C-5	P8-C1-1	0.5	no route	Ignition 1 (IGT1)	—
W22	OEM-C-13	P8-C1-38	0.5	no route	Ignition 2 (IGT2)	—
W23	OEM-D-12	P8-C1-37	0.5	no route	Injector 1&7 (#10)	—
W24	OEM-D-11	P8-C1-18	0.5	no route	Injector 2&8 (#20)	—
W25	OEM-D-24	P8-C1-54	0.5	no route	Injector 3&5 (#40)	—
W26	OEM-D-25	P8-C1-36	0.5	no route	Injector 4&6 (#30)	—
W27	OEM-A-4	P8-C1-48	0.5	no route	Throttle position (VTA1)	—
W28	OEM-A-5	P8-C1-26	0.5	no route	Coolant temperature (THW)	—
W29	OEM-B-4	P8-C1-41	0.5	no route	EFI main relay control (MREL)	—
W30	OEM-B-6	P8-C1-5	0.5	no route	Fuel pump relay (FPR)	—
W31	OEM-B-7	P8-C1-43	0.5	no route	A/C clutch relay (ACMG)	—
W32	OEM-D-19	P8-C1-42	0.5	no route	O2 heater 2 (HT2)	—
W33	OEM-D-20	P8-C1-21	0.5	no route	O2 heater 1 (HT1)	—
W34	OEM-D-17	P8-C1-23	0.5	no route	Cold start injector 1 (STJ1)	—
W35	OEM-D-8	P8-C1-4	0.5	no route	ISC stepper coil 1 (ISC1)	—
W36	OEM-D-7	P8-C1-6	0.5	no route	ISC stepper coil 2 (ISC2)	—
W37	OEM-D-6	P8-C1-17	0.5	no route	ISC stepper coil 3 (ISC3)	—
W38	OEM-D-5	P8-C1-35	0.5	no route	ISC stepper coil 4 (ISC4)	—
W39	OEM-B-5	P8-C1-53	0.5	no route	Check-engine lamp (W)	—
W40	OEM-B-8	P8-C1-16	0.5	no route	Fuel pump control (FC)	—
W41	OEM-A-17	P8-C1-12	0.5	no route	O2 right front (OXR1)	—
W42	OEM-A-6	P8-C1-25	0.5	no route	O2 left front (OXL1)	—
W43	OEM-B-11	P8-C1-7	0.5	no route	O2 right rear (OXR2)	—
W44	OEM-B-24	P8-C1-44	0.5	no route	O2 left rear (OXL2)	—
W45	OEM-A-16	P8-C1-45	0.5	no route	Intake air temperature (THA)	—
W46	OEM-C-2	P8-C1-11	0.5	no route	Igniter 1 feedback (IGF1)	—
W47	OEM-C-10	P8-C1-50	0.5	no route	Igniter 2 feedback (IGF2)	—
W48	OEM-A-19	P8-C1-9	0.5	no route	Vehicle speed (SPD)	—
W49	OEM-A-9	P8-C1-13	0.5	no route	Diagnostic test 1 (TE1)	—
W50	OEM-A-20	P8-C1-14	0.5	no route	Diagnostic test 2 (TE2)	—
W51	OEM-A-14	P8-C1-31	0.5	no route	Neutral start switch (NSW)	—
W52	OEM-A-2	P8-C1-32	0.5	no route	Starter signal (STA)	—
W53	OEM-B-19	P8-C1-33	0.5	no route	Stop light switch (BK)	—

Bill of materials

Category	Part number	Manufacturer	Description	Qty	Unit

ECU setup sheet

Role	Engine ref	Engine signal	Sensor	ECU point	ECU function	ECU class	Setup flag
No configured channels.

Findings

Open (10)

Severity	Code	Subject	Message
error	REQUIRED_UNMAPPED	OEM-A-1	Required OEM function "Ignition switch (IGSW)" (digital_in) is not connected to the new ECU.
warn	LOAD_UNKNOWN	P8-C1-41	P8-C1-41 "Fuel Pump Relay" drives OEM-B-4 EFI main relay control (MREL) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warn	LOAD_UNKNOWN	P8-C1-43	P8-C1-43 "Aux Out 3" drives OEM-B-7 A/C clutch relay (ACMG) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warn	LOAD_UNKNOWN	P8-C1-5	P8-C1-5 "Aux Out 2" drives OEM-B-6 Fuel pump relay (FPR) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warn	NET_FAMILY	OEM-C-6 ↔ P8-C1-29	OEM-C-6 "Cam sensor 2 + (G2+)" [trigger_in] is wired to P8-C1-29 "Left Driven Wheel" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot.
info	NET_FAMILY	OEM-B-5 ↔ P8-C1-53	OEM-B-5 "Check-engine lamp (W)" [low_side_out] is wired to P8-C1-53 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-B-8 ↔ P8-C1-16	OEM-B-8 "Fuel pump control (FC)" [low_side_out] is wired to P8-C1-16 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-D-5 ↔ P8-C1-35	OEM-D-5 "ISC stepper coil 4 (ISC4)" [low_side_out] is wired to P8-C1-35 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-D-6 ↔ P8-C1-17	OEM-D-6 "ISC stepper coil 3 (ISC3)" [low_side_out] is wired to P8-C1-17 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	UNMAPPED	OEM	12 optional OEM pins are not mapped: OEM-A-7 EGR temperature sensor; OEM-A-8 Knock/shield (KS); OEM-B-20 A/T kickdown switch (KD); OEM-B-23 A/C request (AC); OEM-C-1 TPS idle switch (IDL); OEM-C-11 Knock sensor 2 (KNK2); OEM-C-12 Check connector VF2; OEM-C-3 Knock sensor 1 (KNK1); OEM-C-4 Check connector VF1; OEM-D-21 EGR solenoid; OEM-D-22 Fuel pressure-up VSV (PR); OEM-D-4 Cold start injector (STJ)

Accepted (1)

Code	Subject	Reason	By
REQUIRED_UNMAPPED	OEM-B-26	Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed.	mapping-proposal

Notes

Fit check: unconfirmed. Confirm these before building: - Knock input count not found Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-A 1: Ignition switch (IGSW): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); DTAFast P8 has no dedicated key-on input Not wired: - OEM-B 26: Battery constant (BATT): DTAFast P8 has no battery-constant input; not needed - OEM-C 3: Knock sensor 1 (KNK1): no free knock input on DTAFast P8 - OEM-C 11: Knock sensor 2 (KNK2): no free knock input on DTAFast P8 - OEM-A 8: Knock/shield (KS): no free knock input on DTAFast P8 - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast P8 - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast P8 - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast P8 - OEM-A 7: EGR temperature sensor: no free thermistor/analog_0_5 on DTAFast P8 - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on DTAFast P8 - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on DTAFast P8 - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on DTAFast P8 - OEM-C 4: Check connector VF1: no free analog_out on DTAFast P8 - OEM-C 12: Check connector VF2: no free analog_out on DTAFast P8

Sources

Reliability	Kind	Title	URL	Archive	Captured	SHA-256
4	vendor_doc	DTAFast P8Pro wiring schematic	https://dtafast.co.uk/pages/ecu-wiring-diagrams	—	—	—
2	community_copy	Lextreme: Adaptronic install for 1UZ-FE (Lexus LS400/SC400) — 4-plug A/B/C/D ECU pin table (1992 LS400)	https://www.lextreme.com/installation-of-an-adaptronic-ecu-for-a-lexus-ls400-sc400-1uzfe-engine/	—	—	—