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.

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Stock ECU being replaced

MAXXECUSTREE-C1-B4 GPO 1

MAXXECUSTREE-C1-C4 GPO 2

MAXXECUSTREE-C1-K4 DIN 2

MAXXECUSTREE-C1-M3 INJ 5

MAXXECUSTREE-C1-D4 GPO 3

MAXXECUSTREE-C1-K3 DIN 1

MAXXECUSTREE-C1-A4 GPO 8/TACHO

OEM-1

Stock ECU being replaced

ACooling fan relay (low-side)

BA/C condenser fan relay

CStarter input (12V while cranking)

ECheck engine light (MIL)

GA/C clutch relay

MVehicle speed sensor (VSS)

UFuel pump relay (low-side)

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

MAXXECUSTREE-C1-G2 TPS/AIN

MAXXECUSTREE-C1-F1 CLT

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

5V ref

MAXXECUSTREE-C1-F2 IAT

MAXXECUSTREE-C1-D1 WBO2 Heater-

0V sensor

OEM-3

Stock ECU being replaced

BMAF sensor input

FThrottle position (TPS)

GEngine coolant temp (CLT)

HEGR boost sensor

I+5V sensor reference

KIntake air temp (IAT)

MFront O2 heater control

OSensor ground

GND

ECU power +12V (main relay)

GND

MAXXECUSTREE-C1-H3 TRIGGER

MAXXECUSTREE-C1-H4 HOME

0V sensor

MAXXECUSTREE-C1-L3 INJ 6

GND

MAXXECUSTREE-C1-A2 IGN 1

MAXXECUSTREE-C1-A3 IGN 2

MAXXECUSTREE-C1-K1 INJ 1

MAXXECUSTREE-C1-K2 INJ 2

MAXXECUSTREE-C1-M1 INJ 3

MAXXECUSTREE-C1-M2 INJ 4

OEM-4

Stock ECU being replaced

AChassis ground

BECU power +12V (main relay)

CChassis ground

DChassis ground

ECrank position (CKP) sensor

GCAS SGC (cam sync)

HCrank pickup timing ground (CKP gnd)

JPRC solenoid (FPR control)

KChassis ground

NIgnition coil trigger (cyl 1&4)

RIgnition coil trigger (cyl 2&3)

UInjector 1 (cyl 1)

VInjector 2 (cyl 2)

WInjector 3 (cyl 3)

XInjector 4 (cyl 4)

MAXXECUSTREE

MAXXECUSTREE-C1

MAXXECUSTREE

A2IGN 1

A3IGN 2

A4GPO 8/TACHO

B4GPO 1

C4GPO 2

D1WBO2 Heater-

D4GPO 3

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-4-N Ignition coil trigger (cyl 1&4)

OEM-4-R Ignition coil trigger (cyl 2&3)

OEM-1-U Fuel pump relay (low-side)

OEM-1-A Cooling fan relay (low-side)

OEM-1-B A/C condenser fan relay

OEM-3-M Front O2 heater control

OEM-1-G A/C clutch relay

OEM-3-G Engine coolant temp (CLT)

OEM-3-K Intake air temp (IAT)

5V ref

OEM-3-F Throttle position (TPS)

0V sensor

OEM-4-E Crank position (CKP) sensor

OEM-4-G CAS SGC (cam sync)

OEM-3-B MAF sensor input

OEM-3-H EGR boost sensor

OEM-4-U Injector 1 (cyl 1)

OEM-4-V Injector 2 (cyl 2)

OEM-1-M Vehicle speed sensor (VSS)

OEM-1-C Starter input (12V while cranking)

OEM-4-J PRC solenoid (FPR control)

GND

OEM-4-W Injector 3 (cyl 3)

OEM-4-X Injector 4 (cyl 4)

OEM-1-E Check engine light (MIL)

+12V ECU power supply

SP-0V · 5 pins

SP-14V · 3 pins

SP-GND · 6 pins