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

ME221-C1-33 INJECTOR 3

ME221-C1-3 INJECTOR 4

ME221-C1-63 INJECTOR 1

ME221-C1-4 INJECTOR 2

GND

ME221-C1-22 CAM A VR+

ME221-C1-32 COIL 1

ME221-C1-31 COIL 2

ME221-C1-2 COIL 3

ME221-C1-73 LOW SIDE 1

ME221-C1-12 LOW SIDE 2

ME221-C1-74 LOW SIDE 3

ME221-C1-44 LOW SIDE 4

GND

0V sensor

ME221-C1-80 CRANK VR+

ME221-C1-53 KNOCK 1 SIGNAL

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+)

28Knock sensor 1 (KNK1, front)

31Power ground (E02)

5V ref

ME221-C1-16 LSU HEATER -VE

ME221-C1-63 INJECTOR 1

ME221-C1-4 INJECTOR 2

ME221-C1-26 ANA VOLT 1

ME221-C1-86 ANA TEMP 1

ME221-C1-56 ANA VOLT 2

ME221-C1-18 ANA VOLT 4

GND

0V sensor

ME221-C1-57 ANA TEMP 2

ME221-C1-17 ANA VOLT 3

OEM-B75

Stock ECU being replaced

2Sensor power (VC)

4O2 sensor heater (HT)

5Injector 1 (#10)

6Injector 2 (#20)

9Manifold pressure (PIM)

14Coolant temperature (THW)

15Accelerator pedal 1 (VPA)

16Accelerator pedal 2 (VPA2)

17Power ground (E1)

18Sensor ground (E2)

19MAF ground (EVG)

22Intake air temperature (THA)

23Throttle position 1 (VTA)

ME221-C1-37 LOW SIDE RELAY 11

ME221-C1-42 LOW SIDE RELAY 12

ME221-C1-72 LOW SIDE RELAY 13

ME221-C1-43 LOW SIDE RELAY 14

ME221-C1-7 DIG_IN 2

OEM-B76

Stock ECU being replaced

1A/T shift solenoid 1 (S1)

2A/T shift solenoid 2 (S2)

3A/T shift solenoid 3 (S3)

6A/T shift solenoid 4 (S4)

11No.2 speed sensor return (SP2-)

ME221-C1-69 LOW SIDE 5

ME221-C1-79 TACHOMETER

ME221-C1-6 DIG_IN 1

OEM-B77

Stock ECU being replaced

13A/C clutch relay (ACMG)

20Tachometer output (TACH)

25No.1 speed sensor (SPD)

ETCS-i power (+BM)

EFI main relay power (+B2)

ME221-C1-39 LOW SIDE 6

EFI main relay power (+B)

0V sensor

OEM-B78

Stock ECU being replaced

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

ME221

ME221-C1

ME221

2COIL 3

3INJECTOR 4

4INJECTOR 2

6DIG_IN 1

7DIG_IN 2

10GROUND CHASSIS

12LOW SIDE 2

15IGN +12V

16LSU HEATER -VE

17ANA VOLT 3

18ANA VOLT 4

22CAM A VR+

26ANA VOLT 1

31COIL 2

32COIL 1

33INJECTOR 3

37LOW SIDE RELAY 11

39LOW SIDE 6

42LOW SIDE RELAY 12

43LOW SIDE RELAY 14

44LOW SIDE 4

455V REF

52SENSORS GROUND

53KNOCK 1 SIGNAL

56ANA VOLT 2

57ANA TEMP 2

61GROUND

63INJECTOR 1

64VBAT

69LOW SIDE 5

72LOW SIDE RELAY 13

73LOW SIDE 1

74LOW SIDE 3

79TACHOMETER

80CRANK VR+

84Sensor Ground

86ANA TEMP 1

89GROUND

90GROUND

OEM-B74-13 Ignition 3 (IGT3, cyl 3&4)

OEM-B74-2 Injector 4 (#40)

INJECTOR 2 · 2 pins

OEM-B77-25 No.1 speed sensor (SPD)

OEM-B76-11 No.2 speed sensor return (SP2-)

GND

OEM-B74-18 VVT-i OCV + (OCV+)

IGN +12V

OEM-B75-4 O2 sensor heater (HT)

OEM-B75-23 Throttle position 1 (VTA)

OEM-B75-16 Accelerator pedal 2 (VPA2)

OEM-B74-10 Cam position (G2)

OEM-B75-9 Manifold pressure (PIM)

OEM-B74-12 Ignition 2 (IGT2, cyl 5&2)

OEM-B74-11 Ignition 1 (IGT, cyl 1&6)

OEM-B74-1 Injector 3 (#30)

OEM-B76-1 A/T shift solenoid 1 (S1)

OEM-B78-10 EFI main relay control (M-REL)

OEM-B76-2 A/T shift solenoid 2 (S2)

OEM-B76-6 A/T shift solenoid 4 (S4)

OEM-B74-20 ETCS-i clutch + (CL+)

5V ref

0V sensor

OEM-B74-28 Knock sensor 1 (KNK1, front)

OEM-B75-15 Accelerator pedal 1 (VPA)

OEM-B75-22 Intake air temperature (THA)

GND

Injector 1 (#10) · 2 pins

VBAT

OEM-B77-13 A/C clutch relay (ACMG)

OEM-B76-3 A/T shift solenoid 3 (S3)

OEM-B74-17 VVT-i OCV - (OCV-)

OEM-B74-19 ETCS-i clutch - (CL-)

OEM-B77-20 Tachometer output (TACH)

OEM-B74-23 Crank position (NE+)

0V sensor

OEM-B75-14 Coolant temperature (THW)

GND

SP-GND · 9 pins

SP-0V · 7 pins

SP-14V · 6 pins