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

5 no data

7–8 no data

MAXXECUSPORT-C1-K3 DIN 1

11 no data

14 no data

MAXXECUSPORT-C1-B4 GPO 1

MAXXECUSPORT-C1-D4 GPO 3

MAXXECUSPORT-C1-A1 GPO 4

MAXXECUSPORT-C1-B1 GPO 5

22 no data

MAXXECUSPORT-C1-J4 AIN 4 (0-5V)

MAXXECUSPORT-C1-A4 GPO 8/TACHO

MAXXECUSPORT-C1-D3 AIN 7 (0-5V)

MAXXECUSPORT-C1-E4 AIN 8 (0-5V)

31 no data

OEM-A

Stock ECU being replaced

5 no data

7–8 no data

9Vehicle speed sensor

11 no data

14 no data

15Fuel pump relay (USDM)

16Fuel pump relay (JDM)

17A/C clutch relay

20Radiator fan relay

22 no data

23Secondary O2 sensor

28Air pump relay

29Fuel tank pressure sensor

30Electrical load detector

31 no data

Power source 1 (main relay)

GND

MAXXECUSPORT-C1-K2 INJ 2

MAXXECUSPORT-C1-M1 INJ 3

MAXXECUSPORT-C1-M2 INJ 4

6–8 no data

Power source 2 (main relay)

GND

MAXXECUSPORT-C1-K1 INJ 1

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

13–19 no data

GND

MAXXECUSPORT-C1-L3 INJ 6

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

MAXXECUSPORT-C1-D1 WBO2 Heater-

MAXXECUSPORT-C1-A2 IGN 1

MAXXECUSPORT-C1-K4 DIN 2

6 no data

0V sensor

MAXXECUSPORT-C1-H3 TRIGGER

SP-0V · 2 pins

MAXXECUSPORT-C1-M3 INJ 5

MAXXECUSPORT-C1-A3 IGN 2

MAXXECUSPORT-C1-B2 IGN 3

MAXXECUSPORT-C1-B3 IGN 4

MAXXECUSPORT-C1-C1 AIN 5 (0-5V)

MAXXECUSPORT-C1-D2 AIN 6 (0-5V)

MAXXECUSPORT-C1-J3 AIN 3 (0-5V)

0V sensor

5V ref

MAXXECUSPORT-C1-H4 HOME

SP-0V · 2 pins

23 no data

MAXXECUSPORT-C1-F2 IAT

MAXXECUSPORT-C1-F1 CLT

MAXXECUSPORT-C1-G2 TPS/AIN

5V ref

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−)

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

30Cam (TDC2) sensor −

31Timing ground

1–16 no data

OEM-D

Stock ECU being replaced

1–16 no data

MAXXECUSPORT

MAXXECUSPORT-C1

MAXXECUSPORT

A1GPO 4

A2IGN 1

A3IGN 2

A4GPO 8/TACHO

B1GPO 5

B2IGN 3

B3IGN 4

B4GPO 1

C1AIN 5 (0-5V)

C4GPO 2

D1WBO2 Heater-

D2AIN 6 (0-5V)

D3AIN 7 (0-5V)

D4GPO 3

E4AIN 8 (0-5V)

F1CLT

F2IAT

G1+5V sensor supply

G2TPS/AIN

H1Sensor GND

H2Trigger GND

H3TRIGGER

H4HOME

J3AIN 3 (0-5V)

J4AIN 4 (0-5V)

K1INJ 1

K2INJ 2

K3DIN 1

K4DIN 2

L3INJ 6

L4Engine GND

M1INJ 3

M2INJ 4

M3INJ 5

M4+12V ECU power supply

OEM-A-17 A/C clutch relay

OEM-C-4 Ignition coil 1

OEM-C-12 Ignition coil 2

OEM-A-28 Air pump relay

OEM-A-20 Radiator fan relay

OEM-C-13 Ignition coil 3

OEM-C-14 Ignition coil 4

OEM-A-15 Fuel pump relay (USDM)

OEM-C-15 Secondary O2 sensor

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

OEM-C-1 Primary O2 heater

OEM-C-16 Primary O2 sensor

OEM-A-29 Fuel tank pressure sensor

OEM-A-16 Fuel pump relay (JDM)

OEM-A-30 Electrical load detector

OEM-C-26 Coolant temp sensor

OEM-C-25 Intake air temp sensor

5V ref

OEM-C-27 Throttle position sensor

0V sensor

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

OEM-C-20 Cam (TDC1) sensor +

OEM-C-17 MAP sensor

OEM-A-23 Secondary O2 sensor

OEM-B-11 Injector 1

OEM-B-3 Injector 2

OEM-A-9 Vehicle speed sensor

OEM-C-5 Alternator FR signal

OEM-B-23 Idle air control valve

GND

OEM-B-4 Injector 3

OEM-B-5 Injector 4

OEM-C-11 Secondary O2 heater control

+12V ECU power supply

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)

MAXXECUSPORT-C1-C4 GPO 2

SP-GND · 6 pins

SP-14V · 6 pins

SP-5V1 · 4 pins

SP-0V · 9 pins