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Toyota Supra A70 1986-92 (7M-GTE) → AMP EFI MS3Pro EVO+ HC (auto)

Toyota Supra A70 1986-92 (7M-GTE) — AMP EFI — MS3Pro EVO+ HC
⚠ 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.

Statusdraft · not yet verified: nobody has reported building and running this harness
Open errors2: read the Findings page before cutting any wire
Size of the job22 wires · 8 connectors · 0 part lines
ToolsCrimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Order of work1. 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.

WireFromToGaugeColourCutLabelCrimp ACrimp BPin APin BContinuity
W1OEM-A-26SP-GND-10.85☐☐☐☐☐☐☐
W2SP-GND-1MS3PROEVOHC-B-30.85☐☐☐☐☐☐☐
W3SP-GND-1MS3PROEVOHC-B-50.85☐☐☐☐☐☐☐
W4SP-GND-1MS3PROEVOHC-B-70.85☐☐☐☐☐☐☐
W5SP-GND-1MS3PROEVOHC-B-90.85☐☐☐☐☐☐☐
W6OEM-B-9SP-0V-10.5☐☐☐☐☐☐☐
W7SP-0V-1MS3PROEVOHC-A-130.5☐☐☐☐☐☐☐
W8SP-0V-1MS3PROEVOHC-A-180.5☐☐☐☐☐☐☐
W9SP-0V-1MS3PROEVOHC-C-170.5☐☐☐☐☐☐☐
W10SP-0V-1MS3PROEVOHC-C-180.5☐☐☐☐☐☐☐
W11SP-0V-1MS3PROEVOHC-C-190.5☐☐☐☐☐☐☐
W12SP-0V-1MS3PROEVOHC-C-200.5☐☐☐☐☐☐☐
W13SP-0V-1MS3PROEVOHC-C-210.5☐☐☐☐☐☐☐
W14OEM-A-12MS3PROEVOHC-A-30.5☐☐☐☐☐☐☐
W15OEM-A-11MS3PROEVOHC-A-40.5☐☐☐☐☐☐☐
W16OEM-A-25MS3PROEVOHC-B-10.5☐☐☐☐☐☐☐
W17OEM-B-11MS3PROEVOHC-A-90.5☐☐☐☐☐☐☐
W18OEM-B-4MS3PROEVOHC-A-110.5☐☐☐☐☐☐☐
W19OEM-B-2MS3PROEVOHC-B-280.5☐☐☐☐☐☐☐
W20OEM-B-6MS3PROEVOHC-A-250.5☐☐☐☐☐☐☐
W21OEM-B-3MS3PROEVOHC-A-100.5☐☐☐☐☐☐☐
W22OEM-D-9MS3PROEVOHC-B-340.5☐☐☐☐☐☐☐

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 AProbe BExpectWhyReading
No supply/ground nets found to cross-check.

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

Revisions

RevLabelByDate
No revisions yet.

Schematic

MS3PROEVOHC-AMS3PROEVOHC-BMS3PROEVOHC-COEM-AOEM-BOEM-DSP-0VSP-GND

Connectors

MS3PROEVOHC-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1High current out 1————————
10MAT in—W21—0.5OEM-B-3———
11CLT in—W18—0.5OEM-B-4———
12Analog In 6————————
13Logic Ground—W7—0.5SP-0V-1———
14PWM / Idle Out 1————————
15CKP−————————
16Ground Shield Drain————————
17Analog In 7————————
18Sensor return—W8—0.5SP-0V-1———
19Analog in 1————————
2High current out 2————————
20Analog in 2————————
21Analog in 3————————
22Analog In 4————————
23Analog In 5————————
24Tach out————————
25O2 in—W20—0.5OEM-B-6———
26CMP+————————
27CMP−————————
28Fuel pump relay out————————
29PWM out 2————————
3Injector out J—W14—0.5OEM-A-12———
30PWM out 3————————
31Knock in 1————————
32Digital switched in 1————————
33CAN L————————
34CAN H————————
3512V+ switched power in————————
4Injector out I—W15—0.5OEM-A-11———
5High current out 3————————
6CKP+————————
7Knock In 2————————
85V+ VREF out————————
9TPS in—W17—0.5OEM-B-11———

MS3PROEVOHC-B

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Injector out A—W16—0.5OEM-A-25———
10Injector out F————————
11Injector out G————————
12Injector out H————————
13Spark out G————————
14Spark out E————————
15Spark out C————————
16Spark out H————————
17Digital frequency in 2 (Hall)————————
18Ground Shield Drain————————
19Digital switched 12V in————————
2Injector out B————————
20Digital switched in 2————————
21Digital frequency in 3 (unconditioned)————————
22Digital Frequency in 3 (VR+)————————
23Digital Frequency In 3 (VR−)————————
24Spark out F————————
25Spark out B————————
26Spark out D————————
27Spark out A————————
28Digital frequency in 1 (unconditioned)—W19—0.5OEM-B-2———
29Digital switched in 3————————
3Ground—W2—0.85SP-GND-1———
30Stepper IAC out 1B————————
31Stepper IAC out 1A————————
32Stepper IAC out 2A————————
33Stepper IAC out 2B————————
34Digital Frequency in 1 (VR+)—W22—0.5OEM-D-9———
35Digital Frequency in 1 (VR−)————————
4Injector out C————————
5Ground—W3—0.85SP-GND-1———
6Injector out D————————
7Ground—W4—0.85SP-GND-1———
8Injector out E————————
9Ground—W5—0.85SP-GND-1———

MS3PROEVOHC-C

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1PWM out 5————————
10Digital switched in 5————————
11Digital switched in 4————————
12Digital I/O 5————————
13Digital I/O 3————————
14Digital I/O 1————————
155V+ VREF out 2————————
17Sensor return—W9—0.5SP-0V-1———
18Sensor return—W10—0.5SP-0V-1———
19Sensor return—W11—0.5SP-0V-1———
2PWM out 4————————
20Sensor return—W12—0.5SP-0V-1———
21Sensor return—W13—0.5SP-0V-1———
225V+ VREF out 1————————
3Digital out 2————————
4Digital out 1————————
5Digital I/O 4————————
6Digital I/O 2————————
7Analog in 8————————

OEM-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
11Injectors 2 & 6 (No.20)—W15—0.5MS3PROEVOHC-A-4———
12Injectors 1 & 4 (No.10)—W14—0.5MS3PROEVOHC-A-3———
25Injectors 3 & 5 (No.30)—W16—0.5MS3PROEVOHC-B-1———
26Power ground (E01/E02)—W1—0.85SP-GND-1———

OEM-B

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
11Throttle position sensor (VTA)—W17—0.5MS3PROEVOHC-A-9———
2Karman-vortex AFM signal (KS)—W19—0.5MS3PROEVOHC-B-28———
3Intake air temp (THA)—W21—0.5MS3PROEVOHC-A-10———
4Coolant temp (THW)—W18—0.5MS3PROEVOHC-A-11———
6Primary O2 sensor (OX1)—W20—0.5MS3PROEVOHC-A-25———
9Sensor ground (E2)—W6—0.5SP-0V-1———

OEM-D

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
9Vehicle speed sensor (SPD)—W22—0.5MS3PROEVOHC-B-34———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W6—0.5OEM-B-9———
1——W7—0.5MS3PROEVOHC-A-13———
1——W8—0.5MS3PROEVOHC-A-18———
1——W9—0.5MS3PROEVOHC-C-17———
1——W10—0.5MS3PROEVOHC-C-18———
1——W11—0.5MS3PROEVOHC-C-19———
1——W12—0.5MS3PROEVOHC-C-20———
1——W13—0.5MS3PROEVOHC-C-21———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-A-26———
1——W2—0.85MS3PROEVOHC-B-3———
1——W3—0.85MS3PROEVOHC-B-5———
1——W4—0.85MS3PROEVOHC-B-7———
1——W5—0.85MS3PROEVOHC-B-9———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-A-11Injectors 2 & 6 (No.20)injector_outMS3PROEVOHC-A-4Injector out Iinjector_outcorroborated
OEM-A-12Injectors 1 & 4 (No.10)injector_outMS3PROEVOHC-A-3Injector out Jinjector_outcorroborated
OEM-A-25Injectors 3 & 5 (No.30)injector_outMS3PROEVOHC-B-1Injector out Ainjector_outcorroborated
OEM-A-26Power ground (E01/E02)groundMS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9Ground + Ground + Ground + Groundgroundcorroborated
OEM-B-11Throttle position sensor (VTA)analog_inMS3PROEVOHC-A-9TPS inanalog_incorroborated
OEM-B-2Karman-vortex AFM signal (KS)digital_inMS3PROEVOHC-B-28Digital frequency in 1 (unconditioned)digital_incorroborated
OEM-B-3Intake air temp (THA)temp_inMS3PROEVOHC-A-10MAT intemp_incorroborated
OEM-B-4Coolant temp (THW)temp_inMS3PROEVOHC-A-11CLT intemp_incorroborated
OEM-B-6Primary O2 sensor (OX1)lambda_nb_inMS3PROEVOHC-A-25O2 inlambda_nb_incorroborated
OEM-B-9Sensor ground (E2)sensor_groundMS3PROEVOHC-A-13 + MS3PROEVOHC-A-18 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21Logic Ground + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return + Sensor returnsensor_groundcorroborated
OEM-D-9Vehicle speed sensor (SPD)digital_inMS3PROEVOHC-B-34Digital Frequency in 1 (VR+)digital_incorroborated

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-A-26SP-GND-10.85no routePower ground (E01/E02)—
W2SP-GND-1MS3PROEVOHC-B-30.85no routeGround—
W3SP-GND-1MS3PROEVOHC-B-50.85no routeGround—
W4SP-GND-1MS3PROEVOHC-B-70.85no routeGround—
W5SP-GND-1MS3PROEVOHC-B-90.85no routeGround—
W6OEM-B-9SP-0V-10.5no routeSensor ground (E2)—
W7SP-0V-1MS3PROEVOHC-A-130.5no routeLogic Ground—
W8SP-0V-1MS3PROEVOHC-A-180.5no routeSensor return—
W9SP-0V-1MS3PROEVOHC-C-170.5no routeSensor return—
W10SP-0V-1MS3PROEVOHC-C-180.5no routeSensor return—
W11SP-0V-1MS3PROEVOHC-C-190.5no routeSensor return—
W12SP-0V-1MS3PROEVOHC-C-200.5no routeSensor return—
W13SP-0V-1MS3PROEVOHC-C-210.5no routeSensor return—
W14OEM-A-12MS3PROEVOHC-A-30.5no routeInjectors 1 & 4 (No.10)—
W15OEM-A-11MS3PROEVOHC-A-40.5no routeInjectors 2 & 6 (No.20)—
W16OEM-A-25MS3PROEVOHC-B-10.5no routeInjectors 3 & 5 (No.30)—
W17OEM-B-11MS3PROEVOHC-A-90.5no routeThrottle position sensor (VTA)—
W18OEM-B-4MS3PROEVOHC-A-110.5no routeCoolant temp (THW)—
W19OEM-B-2MS3PROEVOHC-B-280.5no routeKarman-vortex AFM signal (KS)—
W20OEM-B-6MS3PROEVOHC-A-250.5no routePrimary O2 sensor (OX1)—
W21OEM-B-3MS3PROEVOHC-A-100.5no routeIntake air temp (THA)—
W22OEM-D-9MS3PROEVOHC-B-340.5no routeVehicle speed sensor (SPD)—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (2)

SeverityCodeSubjectMessage
errorINJECTOR_BALLASTMS3Pro EVO+ HCThe 7M-GTE injectors (7M-GTE fuel injector) are low-impedance, but MS3Pro EVO+ HC drives saturated (high-Z) injectors only. Add a ballast resistor pack in series with each injector, or use an ECU with low-Z / peak-and-hold injector drivers.
errorPHYS_REQUIRED_OPENMS3PROEVOHC-A-35MS3PROEVOHC-A-35 "12V+ switched power in" is required but not wired.

Accepted (0)

CodeSubjectReasonBy

Notes

Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - Main-relay feed: no ecu_main_power pin on the stock or the new ECU - MS3PROEVOHC-A 35: 12V+ switched power in: required by AMP EFI MS3Pro EVO+ HC but no stock pin feeds it; wire by hand - Fuel-pump control: AMP EFI MS3Pro EVO+ HC needs to drive the fuel pump, but the stock ECU has no fuel-pump output (an airflow-meter contact or a separate module runs it). Add a fuel-pump relay on a spare low-side output — see the install notes for this car. Not wired: - MS3PROEVOHC-B 19: Digital switched 12V in: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docAMP EFI: MS3Pro EVO+ / EVO+ HC manual (fw 1.6.1) pinout tableshttps://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_EVO.pdf?v=1760643022archive2026-10-05d5dd8a31822d
4vendor_docToyota 7M-GTE EFI manual — "Terminals of ECU" (complete terminal list, no pin numbers)http://shoarmateam.nl/upload/Toyota-Other/Cressida/MX83/efi%20system%20+%20WIRING/toyota-7m-manual-efi-fi%5b1%5d.pdf———
2forumAllPinouts: 1989–1992 Toyota Supra ECUhttps://allpinouts.org/pinouts/connectors/car/1989-1992-toyota-supra-ecu/———