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.
100%
Stock ECU being replaced
T4-C1-34 Injector 3
T4-C1-25 Injector 4
T4-C1-9 Injector 1
T4-C1-17 Injector 2
GND
T4-C2-22 Cam 1
T4-C1-10 Coil 1
T4-C1-18 Coil 2
T4-C1-1 Coil 3
T4-C1-5 PWM 1
T4-C1-4 PWM 2
T4-C1-3 PWM 3
T4-C3-22 PWM 4
GND
0V sensor
T4-C2-12 Crank
T4-C2-16 Analogue 11
T4-C2-15 Digital 5
GND
OEM-B74
Stock ECU being replaced
1Injector 3 (#30)
2Injector 4 (#40)
3Injector 5 (#50)
4Injector 6 (#60)
9ETCS-i ground (ME01)
10Cam position (G2)
11Ignition 1 (IGT, cyl 1&6)
12Ignition 2 (IGT2, cyl 5&2)
13Ignition 3 (IGT3, cyl 3&4)
17VVT-i OCV - (OCV-)
18VVT-i OCV + (OCV+)
19ETCS-i clutch - (CL-)
20ETCS-i clutch + (CL+)
21Power ground (E01)
22Crank/cam sensor return (NE-)
23Crank position (NE+)
24Neutral/park switch (NSW)
25Igniter verification (IGF)
31Power ground (E02)
5V ref
T4-C3-9 Lambda 1 Heater Negative
T4-C1-9 Injector 1
T4-C1-17 Injector 2
T4-C2-10 Analogue 1
T4-C3-17 Analogue 7
T4-C3-18 Analogue 8
T4-C2-7 Thermistor 1
T4-C2-1 Analogue 2
T4-C2-6 Analogue 4
GND
0V sensor
0V sensor
T4-C2-3 Analogue 10
T4-C2-34 Analogue 9
T4-C2-25 Thermistor 2
T4-C2-5 Analogue 3
T4-C2-19 Analogue 6
OEM-B75
Stock ECU being replaced
2Sensor power (VC)
4O2 sensor heater (HT)
5Injector 1 (#10)
6Injector 2 (#20)
9Manifold pressure (PIM)
10Mass air flow (VG)
12O2 sensor (OX)
14Coolant temperature (THW)
15Accelerator pedal 1 (VPA)
16Accelerator pedal 2 (VPA2)
17Power ground (E1)
18Sensor ground (E2)
19MAF ground (EVG)
20A/T 2nd-gear indicator (2)
21A/T 1st-gear indicator (L)
22Intake air temperature (THA)
23Throttle position 1 (VTA)
24Throttle position 2 (VTA2)
T4-C3-25 PWM 7
T4-C3-10 PWM 8
T4-C2-14 Digital 4
T4-C2-4 Digital 1
T4-C2-17 Thermistor 3
OEM-B76
Stock ECU being replaced
1A/T shift solenoid 1 (S1)
2A/T shift solenoid 2 (S2)
5No.2 speed sensor (SP2+)
11No.2 speed sensor return (SP2-)
17A/T oil temperature (OIL)
T4-C3-23 PWM 5
T4-C2-2 Wheel 1
OEM-B77
Stock ECU being replaced
13A/C clutch relay (ACMG)
25No.1 speed sensor (SPD)
Battery constant (BATT)
ETCS-i power (+BM)
EFI main relay power (+B2)
T4-C3-24 PWM 6
EFI main relay power (+B)
0V sensor
OEM-B78
Stock ECU being replaced
1Battery constant (BATT)
7ETCS-i power (+BM)
8EFI main relay power (+B2)
10EFI main relay control (M-REL)
16EFI main relay power (+B)
22Switch ground (EC)
OEM-B79
Stock ECU being replaced
T4
T4-C1
T4
1Coil 3
3PWM 3
4PWM 2
5PWM 1
9Injector 1
10Coil 1
13Power Ground 1
14Power Ground 2
17Injector 2
18Coil 2
25Injector 4
31Ignition 12v In
34Injector 3
OEM-B74-13 Ignition 3 (IGT3, cyl 3&4)
OEM-B74-19 ETCS-i clutch - (CL-)
OEM-B74-18 VVT-i OCV + (OCV+)
OEM-B74-17 VVT-i OCV - (OCV-)
Injector 1 (#10) · 2 pins
OEM-B74-11 Ignition 1 (IGT, cyl 1&6)
GND
GND
Injector 2 (#20) · 2 pins
OEM-B74-12 Ignition 2 (IGT2, cyl 5&2)
OEM-B74-2 Injector 4 (#40)
Ignition 12v In
OEM-B74-1 Injector 3 (#30)
T4-C2
T4
1Analogue 2
2Wheel 1
3Analogue 10
4Digital 1
5Analogue 3
6Analogue 4
7Thermistor 1
10Analogue 1
12Crank
14Digital 4
15Digital 5
16Analogue 11
17Thermistor 3
19Analogue 6
21Sensor Ground
22Cam 1
245v Output
25Thermistor 2
33Sensor Ground
34Analogue 9
OEM-B75-15 Accelerator pedal 1 (VPA)
OEM-B77-25 No.1 speed sensor (SPD)
OEM-B75-20 A/T 2nd-gear indicator (2)
OEM-B76-11 No.2 speed sensor return (SP2-)
OEM-B75-23 Throttle position 1 (VTA)
OEM-B75-16 Accelerator pedal 2 (VPA2)
OEM-B75-14 Coolant temperature (THW)
OEM-B75-9 Manifold pressure (PIM)
OEM-B74-23 Crank position (NE+)
OEM-B76-5 No.2 speed sensor (SP2+)
OEM-B74-25 Igniter verification (IGF)
OEM-B74-24 Neutral/park switch (NSW)
OEM-B76-17 A/T oil temperature (OIL)
OEM-B75-24 Throttle position 2 (VTA2)
0V sensor
OEM-B74-10 Cam position (G2)
5V ref
OEM-B75-22 Intake air temperature (THA)
0V sensor
OEM-B75-21 A/T 1st-gear indicator (L)
T4-C3
T4
9Lambda 1 Heater Negative
10PWM 8
17Analogue 7
18Analogue 8
22PWM 4
23PWM 5
24PWM 6
25PWM 7
26Permanent 12v
OEM-B75-4 O2 sensor heater (HT)
OEM-B76-2 A/T shift solenoid 2 (S2)
OEM-B75-10 Mass air flow (VG)
OEM-B75-12 O2 sensor (OX)
OEM-B74-20 ETCS-i clutch + (CL+)
OEM-B77-13 A/C clutch relay (ACMG)
OEM-B78-10 EFI main relay control (M-REL)
OEM-B76-1 A/T shift solenoid 1 (S1)
Permanent 12v
SP-GND · 7 pins
SP-0V · 7 pins
SP-14V · 5 pins
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.