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

P8-C1-35 Injector 6

5 no data

7–8 no data

P8-C1-11 Undriven Wheel (must)

11 no data

P8-C1-53 Injector 7

14 no data

P8-C1-41 Fuel Pump Relay

P8-C1-5 Aux Out 2

P8-C1-43 Aux Out 3

P8-C1-16 Injector 8

P8-C1-24 Tacho

P8-C1-42 Cam Phase Valve/Aux Out 4

22 no data

P8-C1-12 Lambda Signal

P8-C1-13 Map2/ALS/Ana1 On/Off

P8-C1-14 Traction Wet/Dry

P8-C1-31 Launch Button

P8-C1-21 Turbo Pressure Valve

P8-C1-44 Analogue Input 3

31 no data

P8-C1-32 Traction On/Off

OEM-A

Stock ECU being replaced

1Coolant temp gauge drive

5 no data

7–8 no data

9Vehicle speed sensor

11 no data

12Immobilizer indicator light

14 no data

15Fuel pump relay (USDM)

16Fuel pump relay (JDM)

17A/C clutch relay

18Check engine light (MIL)

19Tacho output

20Radiator fan relay

22 no data

23Secondary O2 sensor

24Starter switch signal

26Power steering load detect

27A/C switch (request)

28Air pump relay

29Fuel tank pressure sensor

31 no data

32Brake switch

Power source 1 (main relay)

GND

P8-C1-18 Injector 2

P8-C1-54 Injector 3

P8-C1-36 Injector 4

6–8 no data

Power source 2 (main relay)

GND

P8-C1-37 Injector 1

RLY1-R-OUT Relay contact output (switched +12 V to load)

13–19 no data

GND

P8-C1-17 Injector 5

24–25 no data

OEM-B

Stock ECU being replaced

1Power source 1 (main relay)

2Power ground 1

3Injector 2

4Injector 3

5Injector 4

6–8 no data

9Power source 2 (main relay)

10Power ground 2

11Injector 1

12VTEC solenoid

13–19 no data

20Ground

22Ground

23Idle air control valve

24–25 no data

P8-C1-4 Idle Valve

P8-C1-1 Coil 1

P8-C1-50 Undriven Wheel (optional)

6 no data

0V sensor

P8-C1-8 Crank Sensor

SP-0V · 4 pins

P8-C1-33 Shift Cut

P8-C1-6 Shift Light

P8-C1-38 Coil 2

P8-C1-20 Coil 3

P8-C1-2 Coil 4

P8-C1-25 Analogue Input 1

P8-C1-7 Analogue Input 2 Or Log Switch

P8-C1-30 Map

0V sensor

5V ref

P8-C1-27 Cam Sensor

SP-0V · 4 pins

23 no data

P8-C1-45 Air Temp

P8-C1-26 Water Temp

P8-C1-48 Throttle Wiper

5V ref

P8-C1-29 Left Driven Wheel

0V sensor

OEM-C

Stock ECU being replaced

1Primary O2 heater

4Ignition coil 1

5Alternator FR signal

6 no data

7Sensor ground 1

8Crank sensor + (CKP+)

9Crank sensor − (CKP−)

10VTEC pressure switch

11Secondary O2 heater control

12Ignition coil 2

13Ignition coil 3

14Ignition coil 4

15Secondary O2 sensor

16Primary O2 sensor

17MAP sensor

18Sensor ground 2

19Sensor 5V supply 1 (MAP)

20Cam (TDC1) sensor +

21Cam (TDC1) sensor −

23 no data

25Intake air temp sensor

26Coolant temp sensor

27Throttle position sensor

28Sensor 5V supply 2

29Cam (TDC2) sensor +

30Cam (TDC2) sensor −

31Timing ground

1–16 no data

OEM-D

Stock ECU being replaced

1–16 no data

P8-C1

1Coil 1

2Coil 4

4Idle Valve

5Aux Out 2

6Shift Light

7Analogue Input 2 Or Log Switch

8Crank Sensor

105 Volts

11Undriven Wheel (must)

12Lambda Signal

13Map2/ALS/Ana1 On/Off

14Traction Wet/Dry

15Power Ground

16Injector 8

17Injector 5

18Injector 2

1912 Volts

20Coil 3

21Turbo Pressure Valve

23Turbo ALS Valve

24Tacho

25Analogue Input 1

26Water Temp

27Cam Sensor

285 Volts

29Left Driven Wheel

30Map

31Launch Button

32Traction On/Off

33Shift Cut

34Power Ground

35Injector 6

36Injector 4

37Injector 1

38Coil 2

41Fuel Pump Relay

42Cam Phase Valve/Aux Out 4

43Aux Out 3

44Analogue Input 3

45Air Temp

46Signal Ground

47Signal Ground

48Throttle Wiper

49Lambda Earth

50Undriven Wheel (optional)

51Signal Ground

53Injector 7

54Injector 3

55Power Ground

OEM-C-4 Ignition coil 1

OEM-C-14 Ignition coil 4

OEM-C-1 Primary O2 heater

OEM-A-16 Fuel pump relay (JDM)

OEM-C-11 Secondary O2 heater control

OEM-C-16 Primary O2 sensor

OEM-C-8 Crank sensor + (CKP+)

5V ref

OEM-A-9 Vehicle speed sensor

OEM-A-23 Secondary O2 sensor

OEM-A-24 Starter switch signal

OEM-A-26 Power steering load detect

GND

OEM-A-18 Check engine light (MIL)

OEM-B-23 Idle air control valve

OEM-B-3 Injector 2

12 Volts

OEM-C-13 Ignition coil 3

OEM-A-28 Air pump relay

RLY1-R-COIL- Relay coil negative (ECU low-side driver)

OEM-A-19 Tacho output

OEM-C-15 Secondary O2 sensor

OEM-C-26 Coolant temp sensor

OEM-C-20 Cam (TDC1) sensor +

5V ref

OEM-C-29 Cam (TDC2) sensor +

OEM-C-17 MAP sensor

OEM-A-27 A/C switch (request)

OEM-A-32 Brake switch

OEM-C-10 VTEC pressure switch

GND

OEM-A-1 Coolant temp gauge drive

OEM-B-5 Injector 4

OEM-B-11 Injector 1

OEM-C-12 Ignition coil 2

OEM-A-15 Fuel pump relay (USDM)

OEM-A-20 Radiator fan relay

OEM-A-17 A/C clutch relay

OEM-A-29 Fuel tank pressure sensor

OEM-C-25 Intake air temp sensor

0V sensor

OEM-C-27 Throttle position sensor

0V sensor

OEM-C-5 Alternator FR signal

0V sensor

OEM-A-12 Immobilizer indicator light

OEM-B-4 Injector 3

GND

RLY1

RLY1-R

RLY1

INRelay contact input (switched +12 V)

OUTRelay contact output (switched +12 V to load)

COIL+Relay coil positive (switched +12 V)

COIL-Relay coil negative (ECU low-side driver)

SP-14V · 3 pins

OEM-B-12 VTEC solenoid

Relay coil positive (switched +12 V)

P8-C1-23 Turbo ALS Valve

SP-GND · 8 pins

SP-14V · 6 pins

SP-0V · 11 pins