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Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i → ECUMASTER EMU Black (auto)

Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i — ECUMASTER — EMU Black
⚠ 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 job53 wires · 11 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-E2-13SP-14V-10.85☐☐☐☐☐☐☐
W2OEM-E3-16SP-14V-10.85☐☐☐☐☐☐☐
W3OEM-E3-7SP-14V-10.85☐☐☐☐☐☐☐
W4OEM-E3-8SP-14V-10.85☐☐☐☐☐☐☐
W5SP-14V-1EMUBLACK-Black-130.85☐☐☐☐☐☐☐
W6OEM-E6-17SP-GND-10.85☐☐☐☐☐☐☐
W7OEM-E7-21SP-GND-10.85☐☐☐☐☐☐☐
W8SP-GND-1EMUBLACK-Black-270.85☐☐☐☐☐☐☐
W9SP-GND-1EMUBLACK-Black-280.85☐☐☐☐☐☐☐
W10SP-GND-1EMUBLACK-Grey-170.85☐☐☐☐☐☐☐
W11SP-GND-1EMUBLACK-Grey-240.85☐☐☐☐☐☐☐
W12OEM-E6-18SP-0V-10.5☐☐☐☐☐☐☐
W13OEM-E6-19SP-0V-10.5☐☐☐☐☐☐☐
W14OEM-E7-22SP-0V-10.5☐☐☐☐☐☐☐
W15SP-0V-1EMUBLACK-Black-290.5☐☐☐☐☐☐☐
W16SP-0V-1EMUBLACK-Black-380.5☐☐☐☐☐☐☐
W17SP-0V-1EMUBLACK-Black-390.5☐☐☐☐☐☐☐
W18OEM-E6-2EMUBLACK-Black-260.5☐☐☐☐☐☐☐
W19OEM-E7-23EMUBLACK-Black-80.5☐☐☐☐☐☐☐
W20OEM-E7-10EMUBLACK-Black-210.5☐☐☐☐☐☐☐
W21OEM-E7-28EMUBLACK-Black-30.5☐☐☐☐☐☐☐
W22OEM-E7-27EMUBLACK-Black-160.5☐☐☐☐☐☐☐
W23OEM-E7-11EMUBLACK-Grey-80.5☐☐☐☐☐☐☐
W24OEM-E7-12EMUBLACK-Grey-160.5☐☐☐☐☐☐☐
W25OEM-E7-13EMUBLACK-Grey-90.5☐☐☐☐☐☐☐
W26OEM-E6-5EMUBLACK-Grey-70.5☐☐☐☐☐☐☐
W27OEM-E6-6EMUBLACK-Grey-150.5☐☐☐☐☐☐☐
W28OEM-E7-1EMUBLACK-Grey-230.5☐☐☐☐☐☐☐
W29OEM-E7-2EMUBLACK-Grey-60.5☐☐☐☐☐☐☐
W30OEM-E7-3EMUBLACK-Grey-140.5☐☐☐☐☐☐☐
W31OEM-E7-4EMUBLACK-Grey-220.5☐☐☐☐☐☐☐
W32OEM-E3-9EMUBLACK-Grey-180.5☐☐☐☐☐☐☐
W33OEM-E7-17EMUBLACK-Grey-210.5☐☐☐☐☐☐☐
W34OEM-E7-18EMUBLACK-Grey-130.5☐☐☐☐☐☐☐
W35OEM-E7-19EMUBLACK-Grey-50.5☐☐☐☐☐☐☐
W36OEM-E7-20EMUBLACK-Grey-200.5☐☐☐☐☐☐☐
W37OEM-E6-15EMUBLACK-Black-180.5☐☐☐☐☐☐☐
W38OEM-E6-23EMUBLACK-Black-310.5☐☐☐☐☐☐☐
W39OEM-E6-16EMUBLACK-Black-40.5☐☐☐☐☐☐☐
W40OEM-E6-24EMUBLACK-Black-170.5☐☐☐☐☐☐☐
W41OEM-E6-14EMUBLACK-Black-50.5☐☐☐☐☐☐☐
W42OEM-E3-10EMUBLACK-Grey-120.5☐☐☐☐☐☐☐
W43OEM-E3-4EMUBLACK-Grey-40.5☐☐☐☐☐☐☐
W44OEM-E4-13EMUBLACK-Grey-190.5☐☐☐☐☐☐☐
W45OEM-E6-10EMUBLACK-Black-300.5☐☐☐☐☐☐☐
W46OEM-E2-24EMUBLACK-Black-350.5☐☐☐☐☐☐☐
W47OEM-E4-8EMUBLACK-Black-370.5☐☐☐☐☐☐☐
W48OEM-E6-11EMUBLACK-Black-90.5☐☐☐☐☐☐☐
W49OEM-E6-22EMUBLACK-Black-320.5☐☐☐☐☐☐☐
W50OEM-E5-11EMUBLACK-Black-200.5☐☐☐☐☐☐☐
W51OEM-E5-5EMUBLACK-Black-100.5☐☐☐☐☐☐☐
W52OEM-E7-25EMUBLACK-Black-230.5☐☐☐☐☐☐☐
W53OEM-E4-2EMUBLACK-Black-360.5☐☐☐☐☐☐☐

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
1EMUBLACK-Black-13EMUBLACK-Black-27open (OL)+12 V supply must not touch power ground
2EMUBLACK-Black-13EMUBLACK-Black-29open (OL)+12 V supply must not touch sensor ground
3EMUBLACK-Black-13EMUBLACK-Black-26open (OL)+12 V supply must not touch 5 V sensor reference
4EMUBLACK-Black-27EMUBLACK-Black-26open (OL)power ground must not touch 5 V sensor reference
5EMUBLACK-Black-29EMUBLACK-Black-26open (OL)sensor ground must not touch 5 V sensor reference

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

Revisions

RevLabelByDate
No revisions yet.

Schematic

EMUBLACK-BlackEMUBLACK-GreyOEM-E2OEM-E3OEM-E4OEM-E5OEM-E6OEM-E7SP-0VSP-14VSP-GND

Connectors

EMUBLACK-Black

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Ignition coil #5————————
10Switch #1 In—W51—0.5OEM-E5-5———
11RS232 TXD————————
12CAN H————————
13Battery +12V—W5—0.85SP-14V-1———
14Ignition coil #4————————
15EGT in #2————————
16Knock Sensor in #2—W22—0.5OEM-E7-27———
17Analog In #3—W40—0.5OEM-E6-24———
18TPS In—W37—0.5OEM-E6-15———
19WBO Ip————————
2EGT in #1————————
20VSS In—W50—0.5OEM-E5-11———
21Camsync In #1—W20—0.5OEM-E7-10———
22WBO Rcal————————
23Switch #2 In—W52—0.5OEM-E7-25———
24RS232 RXD————————
25CAN L————————
26+5V supply—W18—0.5OEM-E6-2———
27Power Ground—W8—0.85SP-GND-1———
28Ecu Ground—W9—0.85SP-GND-1———
29Sensor Ground—W15—0.5SP-0V-1———
3Knock Sensor in #1—W21—0.5OEM-E7-28———
30Analog In #4—W45—0.5OEM-E6-10———
31Analog In #1—W38—0.5OEM-E6-23———
32IAT In—W49—0.5OEM-E6-22———
33WBO VGND————————
34+5V supply————————
35Analog In #5—W46—0.5OEM-E2-24———
36Switch #3 In—W53—0.5OEM-E4-2———
37Analog In #6—W47—0.5OEM-E4-8———
38Sensor Ground—W16—0.5SP-0V-1———
39Sensor Ground—W17—0.5SP-0V-1———
4Analog In #2—W39—0.5OEM-E6-16———
5CLT In—W41—0.5OEM-E6-14———
6WBO Vs————————
7Camsync In #2————————
8Primary trigger—W19—0.5OEM-E7-23———
9Flex Fuel In—W48—0.5OEM-E6-11———

EMUBLACK-Grey

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Ignition coil #6————————
10H-Bridge #1 Winding B————————
11H-Bridge #2 Winding B————————
12AUX 5—W42—0.5OEM-E3-10———
13AUX 2 / Injector #8—W34—0.5OEM-E7-18———
14Injector #5—W30—0.5OEM-E7-3———
15Injector #2—W27—0.5OEM-E6-6———
16Ignition coil #2—W24—0.5OEM-E7-12———
17Power Ground—W10—0.85SP-GND-1———
18Ignition +12V—W32—0.5OEM-E3-9———
19WBO Heater—W44—0.5OEM-E4-13———
2H-Bridge #1 Winding A————————
20AUX 4 / Tacho—W36—0.5OEM-E7-20———
21AUX 1 / Injector #7—W33—0.5OEM-E7-17———
22Injector #6—W31—0.5OEM-E7-4———
23Injector #3—W28—0.5OEM-E7-1———
24Power Ground—W11—0.85SP-GND-1———
3H-Bridge #2 Winding A————————
4AUX 6—W43—0.5OEM-E3-4———
5AUX 3—W35—0.5OEM-E7-19———
6Injector #4—W29—0.5OEM-E7-2———
7Injector #1—W26—0.5OEM-E6-5———
8Ignition coil #1—W23—0.5OEM-E7-11———
9Ignition coil #3—W25—0.5OEM-E7-13———

OEM-E2

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
13ETCS power (TBP, throttle bypass)—W1—0.85SP-14V-1———
24O2 right rear (OXR2)—W46—0.5EMUBLACK-Black-35———
25O2 heater right rear (HTR2)————————
26O2 heater left rear (HTL2)————————

OEM-E3

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Battery constant (BATT)————————
10EFI main relay control (MREL)—W42—0.5EMUBLACK-Grey-12———
11Serial diagnostic (SIL)————————
16EFI main relay (+B)—W2—0.85SP-14V-1———
4Fuel pump relay (FPR)—W43—0.5EMUBLACK-Grey-4———
5Fuel pump control (FC)————————
6Check-engine lamp (W)————————
7ETCS main relay (+BM)—W3—0.85SP-14V-1———
8EFI main relay (+B2)—W4—0.85SP-14V-1———
9Ignition switch (IGSW)—W32—0.5EMUBLACK-Grey-18———

OEM-E4

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
13A/C clutch relay (ACMG)—W44—0.5EMUBLACK-Grey-19———
18EVAP vapor pressure (PTNK)————————
2Starter signal (STA)—W53—0.5EMUBLACK-Black-36———
5Diagnostic/timing check (TC)————————
6Stop light switch (STP)————————
8O2 left rear (OXL2)—W47—0.5EMUBLACK-Black-37———

OEM-E5

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
11Vehicle speed sensor (SP2-)—W50—0.5EMUBLACK-Black-20———
12Canister close valve (CCV)————————
5Vehicle speed sensor (SP2+)—W51—0.5EMUBLACK-Black-10———

OEM-E6

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
10Mass air flow (VG)—W45—0.5EMUBLACK-Black-30———
11O2 right front (OXR1)—W48—0.5EMUBLACK-Black-9———
12O2 left front (OXL1)————————
14Coolant temperature (THW)—W41—0.5EMUBLACK-Black-5———
15Accelerator pedal 1 (VPA)—W37—0.5EMUBLACK-Black-18———
16Accelerator pedal 2 (VPA2)—W39—0.5EMUBLACK-Black-4———
17Power ground (E1)—W6—0.85SP-GND-1———
18Sensor ground (E2)—W12—0.5SP-0V-1———
19MAF ground (EVG)—W13—0.5SP-0V-1———
2Sensor supply +5V (VC)—W18—0.5EMUBLACK-Black-26———
22Intake air temperature (THA)—W49—0.5EMUBLACK-Black-32———
23Throttle position 1 (VTA)—W38—0.5EMUBLACK-Black-31———
24Throttle position 2 (VTA2)—W40—0.5EMUBLACK-Black-17———
3O2 heater right front (HTR)————————
4O2 heater left front (HTL)————————
5Injector 1 (#10)—W26—0.5EMUBLACK-Grey-7———
6Injector 2 (#20)—W27—0.5EMUBLACK-Grey-15———
7EVAP purge VSV (PRG)————————

OEM-E7

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Injector 3 (#30)—W28—0.5EMUBLACK-Grey-23———
10Cam position (G2)—W20—0.5EMUBLACK-Black-21———
11Ignition 1 (IGT)—W23—0.5EMUBLACK-Grey-8———
12Ignition 2 (IGT2)—W24—0.5EMUBLACK-Grey-16———
13Ignition 3 (IGT3)—W25—0.5EMUBLACK-Grey-9———
17VVT-i OCV - (OCV-)—W33—0.5EMUBLACK-Grey-21———
18VVT-i OCV + (OCV+)—W34—0.5EMUBLACK-Grey-13———
19ETCS throttle clutch - (CL-)—W35—0.5EMUBLACK-Grey-5———
2Injector 4 (#40)—W29—0.5EMUBLACK-Grey-6———
20ETCS throttle clutch + (CL+)—W36—0.5EMUBLACK-Grey-20———
21Power ground (E01)—W7—0.85SP-GND-1———
22Crank position return (NE-)—W14—0.5SP-0V-1———
23Crank position (NE)—W19—0.5EMUBLACK-Black-8———
25Igniter feedback (IGF)—W52—0.5EMUBLACK-Black-23———
27Knock sensor 2 (KNK2)—W22—0.5EMUBLACK-Black-16———
28Knock sensor 1 (KNK1)—W21—0.5EMUBLACK-Black-3———
3Injector 5 (#50)—W30—0.5EMUBLACK-Grey-14———
4Injector 6 (#60)—W31—0.5EMUBLACK-Grey-22———
5ACIS intake VSV————————
7ETCS throttle motor - (M-)————————
8ETCS throttle motor + (M+)————————

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W12—0.5OEM-E6-18———
1——W13—0.5OEM-E6-19———
1——W14—0.5OEM-E7-22———
1——W15—0.5EMUBLACK-Black-29———
1——W16—0.5EMUBLACK-Black-38———
1——W17—0.5EMUBLACK-Black-39———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-E2-13———
1——W2—0.85OEM-E3-16———
1——W3—0.85OEM-E3-7———
1——W4—0.85OEM-E3-8———
1——W5—0.85EMUBLACK-Black-13———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W6—0.85OEM-E6-17———
1——W7—0.85OEM-E7-21———
1——W8—0.85EMUBLACK-Black-27———
1——W9—0.85EMUBLACK-Black-28———
1——W10—0.85EMUBLACK-Grey-17———
1——W11—0.85EMUBLACK-Grey-24———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-E2-13ETCS power (TBP, throttle bypass)power_inEMUBLACK-Black-13Battery +12Vpower_insingle_source
OEM-E2-24O2 right rear (OXR2)lambda_nb_inEMUBLACK-Black-35Analog In #5analog_insingle_source
OEM-E2-25O2 heater right rear (HTR2)low_side_out———single_source
OEM-E2-26O2 heater left rear (HTL2)low_side_out———single_source
OEM-E3-1Battery constant (BATT)power_in———single_source
OEM-E3-10EFI main relay control (MREL)low_side_outEMUBLACK-Grey-12AUX 5low_side_outsingle_source
OEM-E3-11Serial diagnostic (SIL)serial———single_source
OEM-E3-16EFI main relay (+B)power_inEMUBLACK-Black-13Battery +12Vpower_insingle_source
OEM-E3-4Fuel pump relay (FPR)low_side_outEMUBLACK-Grey-4AUX 6low_side_outsingle_source
OEM-E3-5Fuel pump control (FC)low_side_out———single_source
OEM-E3-6Check-engine lamp (W)low_side_out———single_source
OEM-E3-7ETCS main relay (+BM)power_inEMUBLACK-Black-13Battery +12Vpower_insingle_source
OEM-E3-8EFI main relay (+B2)power_inEMUBLACK-Black-13Battery +12Vpower_insingle_source
OEM-E3-9Ignition switch (IGSW)digital_inEMUBLACK-Grey-18Ignition +12Vdigital_insingle_source
OEM-E4-13A/C clutch relay (ACMG)low_side_outEMUBLACK-Grey-19WBO Heaterlow_side_outsingle_source
OEM-E4-18EVAP vapor pressure (PTNK)analog_in———single_source
OEM-E4-2Starter signal (STA)digital_inEMUBLACK-Black-36Switch #3 Indigital_insingle_source
OEM-E4-5Diagnostic/timing check (TC)digital_in———single_source
OEM-E4-6Stop light switch (STP)digital_in———single_source
OEM-E4-8O2 left rear (OXL2)lambda_nb_inEMUBLACK-Black-37Analog In #6analog_insingle_source
OEM-E5-11Vehicle speed sensor (SP2-)digital_inEMUBLACK-Black-20VSS Indigital_insingle_source
OEM-E5-12Canister close valve (CCV)low_side_out———single_source
OEM-E5-5Vehicle speed sensor (SP2+)digital_inEMUBLACK-Black-10Switch #1 Indigital_insingle_source
OEM-E6-10Mass air flow (VG)analog_inEMUBLACK-Black-30Analog In #4analog_insingle_source
OEM-E6-11O2 right front (OXR1)lambda_nb_inEMUBLACK-Black-9Flex Fuel Inanalog_insingle_source
OEM-E6-12O2 left front (OXL1)lambda_nb_in———single_source
OEM-E6-14Coolant temperature (THW)temp_inEMUBLACK-Black-5CLT Intemp_insingle_source
OEM-E6-15Accelerator pedal 1 (VPA)analog_inEMUBLACK-Black-18TPS Inanalog_insingle_source
OEM-E6-16Accelerator pedal 2 (VPA2)analog_inEMUBLACK-Black-4Analog In #2analog_insingle_source
OEM-E6-17Power ground (E1)groundEMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24Power Ground + Ecu Ground + Power Ground + Power Groundgroundsingle_source
OEM-E6-18Sensor ground (E2)sensor_groundEMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39Sensor Ground + Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-E6-19MAF ground (EVG)sensor_groundEMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39Sensor Ground + Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-E6-2Sensor supply +5V (VC)vrefEMUBLACK-Black-26+5V supplyvrefsingle_source
OEM-E6-22Intake air temperature (THA)temp_inEMUBLACK-Black-32IAT Intemp_insingle_source
OEM-E6-23Throttle position 1 (VTA)analog_inEMUBLACK-Black-31Analog In #1analog_insingle_source
OEM-E6-24Throttle position 2 (VTA2)analog_inEMUBLACK-Black-17Analog In #3analog_insingle_source
OEM-E6-3O2 heater right front (HTR)low_side_out———single_source
OEM-E6-4O2 heater left front (HTL)low_side_out———single_source
OEM-E6-5Injector 1 (#10)injector_outEMUBLACK-Grey-7Injector #1injector_outsingle_source
OEM-E6-6Injector 2 (#20)injector_outEMUBLACK-Grey-15Injector #2injector_outsingle_source
OEM-E6-7EVAP purge VSV (PRG)low_side_out———single_source
OEM-E7-1Injector 3 (#30)injector_outEMUBLACK-Grey-23Injector #3injector_outsingle_source
OEM-E7-10Cam position (G2)trigger_inEMUBLACK-Black-21Camsync In #1trigger_insingle_source
OEM-E7-11Ignition 1 (IGT)ignition_outEMUBLACK-Grey-8Ignition coil #1ignition_outsingle_source
OEM-E7-12Ignition 2 (IGT2)ignition_outEMUBLACK-Grey-16Ignition coil #2ignition_outsingle_source
OEM-E7-13Ignition 3 (IGT3)ignition_outEMUBLACK-Grey-9Ignition coil #3ignition_outsingle_source
OEM-E7-17VVT-i OCV - (OCV-)low_side_outEMUBLACK-Grey-21AUX 1 / Injector #7low_side_outsingle_source
OEM-E7-18VVT-i OCV + (OCV+)low_side_outEMUBLACK-Grey-13AUX 2 / Injector #8low_side_outsingle_source
OEM-E7-19ETCS throttle clutch - (CL-)low_side_outEMUBLACK-Grey-5AUX 3low_side_outsingle_source
OEM-E7-2Injector 4 (#40)injector_outEMUBLACK-Grey-6Injector #4injector_outsingle_source
OEM-E7-20ETCS throttle clutch + (CL+)low_side_outEMUBLACK-Grey-20AUX 4 / Tacholow_side_outsingle_source
OEM-E7-21Power ground (E01)groundEMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24Power Ground + Ecu Ground + Power Ground + Power Groundgroundsingle_source
OEM-E7-22Crank position return (NE-)sensor_groundEMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39Sensor Ground + Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-E7-23Crank position (NE)trigger_inEMUBLACK-Black-8Primary triggertrigger_insingle_source
OEM-E7-25Igniter feedback (IGF)digital_inEMUBLACK-Black-23Switch #2 Indigital_insingle_source
OEM-E7-27Knock sensor 2 (KNK2)knock_inEMUBLACK-Black-16Knock Sensor in #2knock_insingle_source
OEM-E7-28Knock sensor 1 (KNK1)knock_inEMUBLACK-Black-3Knock Sensor in #1knock_insingle_source
OEM-E7-3Injector 5 (#50)injector_outEMUBLACK-Grey-14Injector #5injector_outsingle_source
OEM-E7-4Injector 6 (#60)injector_outEMUBLACK-Grey-22Injector #6injector_outsingle_source
OEM-E7-5ACIS intake VSVlow_side_out———single_source
OEM-E7-7ETCS throttle motor - (M-)hbridge_out———single_source
OEM-E7-8ETCS throttle motor + (M+)hbridge_out———single_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-E2-13SP-14V-10.85no routeETCS power (TBP, throttle bypass)—
W2OEM-E3-16SP-14V-10.85no routeEFI main relay (+B)—
W3OEM-E3-7SP-14V-10.85no routeETCS main relay (+BM)—
W4OEM-E3-8SP-14V-10.85no routeEFI main relay (+B2)—
W5SP-14V-1EMUBLACK-Black-130.85no routeBattery +12V—
W6OEM-E6-17SP-GND-10.85no routePower ground (E1)—
W7OEM-E7-21SP-GND-10.85no routePower ground (E01)—
W8SP-GND-1EMUBLACK-Black-270.85no routePower Ground—
W9SP-GND-1EMUBLACK-Black-280.85no routeEcu Ground—
W10SP-GND-1EMUBLACK-Grey-170.85no routePower Ground—
W11SP-GND-1EMUBLACK-Grey-240.85no routePower Ground—
W12OEM-E6-18SP-0V-10.5no routeSensor ground (E2)—
W13OEM-E6-19SP-0V-10.5no routeMAF ground (EVG)—
W14OEM-E7-22SP-0V-10.5no routeCrank position return (NE-)—
W15SP-0V-1EMUBLACK-Black-290.5no routeSensor Ground—
W16SP-0V-1EMUBLACK-Black-380.5no routeSensor Ground—
W17SP-0V-1EMUBLACK-Black-390.5no routeSensor Ground—
W18OEM-E6-2EMUBLACK-Black-260.5no routeSensor supply +5V (VC)—
W19OEM-E7-23EMUBLACK-Black-80.5no routeCrank position (NE)—
W20OEM-E7-10EMUBLACK-Black-210.5no routeCam position (G2)—
W21OEM-E7-28EMUBLACK-Black-30.5no routeKnock sensor 1 (KNK1)—
W22OEM-E7-27EMUBLACK-Black-160.5no routeKnock sensor 2 (KNK2)—
W23OEM-E7-11EMUBLACK-Grey-80.5no routeIgnition 1 (IGT)—
W24OEM-E7-12EMUBLACK-Grey-160.5no routeIgnition 2 (IGT2)—
W25OEM-E7-13EMUBLACK-Grey-90.5no routeIgnition 3 (IGT3)—
W26OEM-E6-5EMUBLACK-Grey-70.5no routeInjector 1 (#10)—
W27OEM-E6-6EMUBLACK-Grey-150.5no routeInjector 2 (#20)—
W28OEM-E7-1EMUBLACK-Grey-230.5no routeInjector 3 (#30)—
W29OEM-E7-2EMUBLACK-Grey-60.5no routeInjector 4 (#40)—
W30OEM-E7-3EMUBLACK-Grey-140.5no routeInjector 5 (#50)—
W31OEM-E7-4EMUBLACK-Grey-220.5no routeInjector 6 (#60)—
W32OEM-E3-9EMUBLACK-Grey-180.5no routeIgnition switch (IGSW)—
W33OEM-E7-17EMUBLACK-Grey-210.5no routeVVT-i OCV - (OCV-)—
W34OEM-E7-18EMUBLACK-Grey-130.5no routeVVT-i OCV + (OCV+)—
W35OEM-E7-19EMUBLACK-Grey-50.5no routeETCS throttle clutch - (CL-)—
W36OEM-E7-20EMUBLACK-Grey-200.5no routeETCS throttle clutch + (CL+)—
W37OEM-E6-15EMUBLACK-Black-180.5no routeAccelerator pedal 1 (VPA)—
W38OEM-E6-23EMUBLACK-Black-310.5no routeThrottle position 1 (VTA)—
W39OEM-E6-16EMUBLACK-Black-40.5no routeAccelerator pedal 2 (VPA2)—
W40OEM-E6-24EMUBLACK-Black-170.5no routeThrottle position 2 (VTA2)—
W41OEM-E6-14EMUBLACK-Black-50.5no routeCoolant temperature (THW)—
W42OEM-E3-10EMUBLACK-Grey-120.5no routeEFI main relay control (MREL)—
W43OEM-E3-4EMUBLACK-Grey-40.5no routeFuel pump relay (FPR)—
W44OEM-E4-13EMUBLACK-Grey-190.5no routeA/C clutch relay (ACMG)—
W45OEM-E6-10EMUBLACK-Black-300.5no routeMass air flow (VG)—
W46OEM-E2-24EMUBLACK-Black-350.5no routeO2 right rear (OXR2)—
W47OEM-E4-8EMUBLACK-Black-370.5no routeO2 left rear (OXL2)—
W48OEM-E6-11EMUBLACK-Black-90.5no routeO2 right front (OXR1)—
W49OEM-E6-22EMUBLACK-Black-320.5no routeIntake air temperature (THA)—
W50OEM-E5-11EMUBLACK-Black-200.5no routeVehicle speed sensor (SP2-)—
W51OEM-E5-5EMUBLACK-Black-100.5no routeVehicle speed sensor (SP2+)—
W52OEM-E7-25EMUBLACK-Black-230.5no routeIgniter feedback (IGF)—
W53OEM-E4-2EMUBLACK-Black-360.5no routeStarter signal (STA)—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (4)

SeverityCodeSubjectMessage
errorREQUIRED_UNMAPPEDOEM-E7-7Required OEM function "ETCS throttle motor - (M-)" (hbridge_out) is not connected to the new ECU.
errorREQUIRED_UNMAPPEDOEM-E7-8Required OEM function "ETCS throttle motor + (M+)" (hbridge_out) is not connected to the new ECU.
warnLOAD_UNKNOWNEMUBLACK-Grey-19EMUBLACK-Grey-19 "WBO Heater" drives OEM-E4-13 A/C clutch relay (ACMG) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
infoUNMAPPEDOEM14 optional OEM pins are not mapped: OEM-E2-25 O2 heater right rear (HTR2); OEM-E2-26 O2 heater left rear (HTL2); OEM-E3-11 Serial diagnostic (SIL); OEM-E3-5 Fuel pump control (FC); OEM-E3-6 Check-engine lamp (W); OEM-E4-18 EVAP vapor pressure (PTNK); OEM-E4-5 Diagnostic/timing check (TC); OEM-E4-6 Stop light switch (STP); OEM-E5-12 Canister close valve (CCV); OEM-E6-12 O2 left front (OXL1); OEM-E6-3 O2 heater right front (HTR); OEM-E6-4 O2 heater left front (HTL); OEM-E6-7 EVAP purge VSV (PRG); OEM-E7-5 ACIS intake VSV

Accepted (1)

CodeSubjectReasonBy
REQUIRED_UNMAPPEDOEM-E3-1Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed.mapping-proposal

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: - OEM-E7 7: ETCS throttle motor - (M-): no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-E7 8: ETCS throttle motor + (M+): no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand Not wired: - OEM-E3 1: Battery constant (BATT): ECUMASTER EMU Black has no battery-constant input; not needed - OEM-E2 25: O2 heater right rear (HTR2): no free heater_low_side/low_side/relay_control/ls_hs/injector on ECUMASTER EMU Black - OEM-E2 26: O2 heater left rear (HTL2): no free heater_low_side/low_side/relay_control/ls_hs/injector on ECUMASTER EMU Black - OEM-E6 3: O2 heater right front (HTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on ECUMASTER EMU Black - OEM-E6 4: O2 heater left front (HTL): no free heater_low_side/low_side/relay_control/ls_hs/injector on ECUMASTER EMU Black - OEM-E3 5: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on ECUMASTER EMU Black - OEM-E3 6: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on ECUMASTER EMU Black - OEM-E5 12: Canister close valve (CCV): no free low_side/relay_control/heater_low_side/ls_hs/injector on ECUMASTER EMU Black - OEM-E6 7: EVAP purge VSV (PRG): no free low_side/relay_control/heater_low_side/ls_hs/injector on ECUMASTER EMU Black - OEM-E7 5: ACIS intake VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on ECUMASTER EMU Black - OEM-E6 12: O2 left front (OXL1): no free o2_narrowband/analog_0_5 on ECUMASTER EMU Black - OEM-E4 18: EVAP vapor pressure (PTNK): no free analog_0_5 on ECUMASTER EMU Black - OEM-E4 5: Diagnostic/timing check (TC): no free switch_in/frequency_in/analog_0_5 on ECUMASTER EMU Black - OEM-E4 6: Stop light switch (STP): no free switch_in/frequency_in/analog_0_5 on ECUMASTER EMU Black - OEM-E3 11: Serial diagnostic (SIL): no free k_line on ECUMASTER EMU Black

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docECUMASTER EMU Black — pinout (Black 39-pin / Grey 24-pin)https://www.ecumaster.com/wp/wp-content/uploads/2020/05/EMU_Black_pinout.pdfarchive2026-10-05096b2b4df1bd
4service_manualToyota FSM RM779U (2001 Lexus IS300) — DIAGNOSTICS 'TERMINALS OF ECM' (DI-20/21)http://www.2jzgarage.com/wp-content/uploads/2013/04/2001_IS300_ECU_Pinouts.pdf———