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
GND
GND
MAXXECUPRO-C3-K3 KEY IN 12V
MAXXECUPRO-C1-D1 WBO2 Heater-
MAXXECUPRO-C4-G4 GPO 26
ECM power (J271 relay feed)
MAXXECUPRO-C1-A4 GPO 8/TACHO
MAXXECUPRO-C1-D4 GPO 3
MAXXECUPRO-C3-A3 DIN 6 (SWITCH)
0V sensor
MAXXECUPRO-C1-G2 TPS/AIN
0V sensor
MAXXECUPRO-C3-D1 ANALOG IN 6 (0-5V)
0V sensor
MAXXECUPRO-C4-H1 GPO 27
MAXXECUPRO-C3-A4 DIN 7 (SWITCH)
MAXXECUPRO-C4-D3 DIN 8 (switch)
MAXXECUPRO-C4-D4 DIN 9 (switch)
MAXXECUPRO-C4-E1 DIN 10 (switch)
MAXXECUPRO-C4-G1 GPO 23
MAXXECUPRO-C4-G2 GPO 24
MAXXECUPRO-C4-E2 DIN 11 (switch)
MAXXECUPRO-C1-G3 WBO2 IP
MAXXECUPRO-C3-B2 WBO2 2 IP
MAXXECUPRO-C1-J3 AIN 3 (0-5V)
MAXXECUPRO-C1-K3 DIN/VR 1
MAXXECUPRO-C1-K4 DIN/VR 2
MAXXECUPRO-C3-A1 DIN/VR 4
MAXXECUPRO-C3-A2 DIN/VR 5
MAXXECUPRO-C4-A2 CAN 2 L
MAXXECUPRO-C4-A1 CAN 2 H
MAXXECUPRO-C3-E1 GPO 10/WBO2 2 HTR
MAXXECUPRO-C4-G3 GPO 25
MAXXECUPRO-C1-B4 GPO 1
MAXXECUPRO-C1-C4 GPO 2
MAXXECUPRO-C3-E3 ANALOG IN 10 (0-5V)
MAXXECUPRO-C3-D3 ANALOG IN 8 (0-5V)
MAXXECUPRO-C3-E2 ANALOG IN 9 (0-5V)
MAXXECUPRO-C1-F4 WBO2 VS
MAXXECUPRO-C3-B3 WBO2 2 VS
5V ref
5V ref
MAXXECUPRO-C3-F2 ANALOG IN 11 (0-5V)
MAXXECUPRO-C3-F3 ANALOG IN 12 (0-5V)
MAXXECUPRO-C1-E4 GPO 4
MAXXECUPRO-C1-H3 TRIGGER
5V ref
MAXXECUPRO-C3-C3 ANALOG IN 5 (0-5V)
MAXXECUPRO-C1-F2 IAT
MAXXECUPRO-C1-H4 HOME
MAXXECUPRO-C1-M2 INJ 4
MAXXECUPRO-C1-K2 INJ 2
0V sensor
0V sensor
MAXXECUPRO-C3-D2 ANALOG IN 7 (0-5V)
MAXXECUPRO-C1-F1 CLT
MAXXECUPRO-C1-B3 IGN 4
MAXXECUPRO-C1-A3 IGN 2
MAXXECUPRO-C1-K1 INJ 1
MAXXECUPRO-C1-M1 INJ 3
5V ref
5V ref
MAXXECUPRO-C1-J4 AIN 4 (0-5V)
MAXXECUPRO-C1-A2 IGN 1
MAXXECUPRO-C1-B2 IGN 3
MAXXECUPRO-C1-A1 GPO 5
MAXXECUPRO-C1-B1 GPO 6
MAXXECUPRO-C4-F2 Knock 1
MAXXECUPRO-C4-F3 Knock 2
0V sensor
MAXXECUPRO-C1-C1 GPO 7
MAXXECUPRO-C3-L3 GPO 11/MOTOR 1 -
MAXXECUPRO-C3-L2 GPO 12/MOTOR 1 +
ECM + coil power (J271 relay feed)
OEM-T121
Stock ECU being replaced
1ECU ground
2ECU ground
3Ignition switch +12V (term 15)
5Wideband lambda heater (Z19)
9Secondary-air injection valve (N112)
21ECM power (J271 relay feed)
22Brake vacuum pump (V192)
25V144 Evaporative diagnostic pump (Pin 2)
28Alternator DF terminal (charge warning)
29MAF sensor ground (G70)
33Accelerator pedal position 1 (G79)
34Accelerator pedal position 1 ground (G79)
35Accelerator pedal position 2 (G185)
36Accelerator pedal position 2 ground (G185)
37Engine speed signal (tacho to cluster)
38Cruise control switch (E45)
39Clutch pedal switch (F36)
40A/C signal
41A/C signal
47Check engine light (MIL)
48EPC warning light
49Power steering pressure switch (F88)
51Wideband lambda pump (G39)
52Wideband lambda pump (G39)
53MAF sensor signal (G70)
54Road speed signal (VSS)
55Brake pedal switch (F)
56Brake pedal switch (F)
57Cruise control switch (E45)
58CAN bus low
60CAN bus high
63Post-cat lambda heater (Z29)
64EVAP canister valve (N80)
65Fuel pump relay control
66Secondary-air pump relay (J299)
67Crash sensor signal
68Post-cat lambda signal (G130)
69Post-cat lambda signal (G130)
70Wideband lambda Nernst signal (G39)
71Wideband lambda Nernst signal (G39)
72Accelerator pedal position 1 5V supply (G79)
73Accelerator pedal position 2 5V supply (G185)
75Cruise control switch (E45)
76Cruise control switch (E45)
80V144 Evap Diagnostic Pump (Pin 1)
82Crank position sensor (G28)
83Throttle position sensor 5V supply (G187/G188)
84Throttle position sensor 1 (G187)
85Intake air temperature (G42)
86Camshaft position sensor (G40)
88Injector 4 (N33)
89Injector 2 (N31)
90Crank position sensor ground (G28)
91Throttle position sensor ground (G187/G188)
92Throttle position sensor 2 (G188)
93Engine coolant temperature (G62)
94Ignition coil 4 (N163)
95Ignition coil 2 (N128)
96Injector 1 (N30)
97Injector 3 (N32)
98Cam + boost sensor 5V supply (G40/G31)
99Knock sensor 5V supply (G61/G66)
101Boost pressure sensor (G31)
102Ignition coil 1 (N127)
103Ignition coil 3 (N158)
104Boost control solenoid (N75)
105Diverter valve (N249)
106Knock sensor 1 (G61)
107Knock sensor 2 (G66)
108Sensor ground
115VVT camshaft adjustment valve (N205)
117Throttle motor G186 (+)
118Throttle motor G186 (−)
121ECM + coil power (J271 relay feed)
MAXXECUPRO
MAXXECUPRO-C1
MAXXECUPRO
A1GPO 5
A2IGN 1
A3IGN 2
A4GPO 8/TACHO
B1GPO 6
B2IGN 3
B3IGN 4
B4GPO 1
C1GPO 7
C4GPO 2
D1WBO2 Heater-
D4GPO 3
E4GPO 4
F1CLT
F2IAT
F4WBO2 VS
G1+5V sensor supply
G2TPS/AIN
G3WBO2 IP
H1Sensor GND
H2Trigger GND
H3TRIGGER
H4HOME
J3AIN 3 (0-5V)
J4AIN 4 (0-5V)
K1INJ 1
K2INJ 2
K3DIN/VR 1
K4DIN/VR 2
L4Engine GND
M1INJ 3
M2INJ 4
M4+12V ECU power supply
OEM-T121-104 Boost control solenoid (N75)
OEM-T121-102 Ignition coil 1 (N127)
OEM-T121-95 Ignition coil 2 (N128)
OEM-T121-22 Brake vacuum pump (V192)
OEM-T121-105 Diverter valve (N249)
OEM-T121-103 Ignition coil 3 (N158)
OEM-T121-94 Ignition coil 4 (N163)
OEM-T121-65 Fuel pump relay control
OEM-T121-115 VVT camshaft adjustment valve (N205)
OEM-T121-66 Secondary-air pump relay (J299)
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-25 V144 Evaporative diagnostic pump (Pin 2)
OEM-T121-80 V144 Evap Diagnostic Pump (Pin 1)
OEM-T121-93 Engine coolant temperature (G62)
OEM-T121-85 Intake air temperature (G42)
OEM-T121-70 Wideband lambda Nernst signal (G39)
5V ref
OEM-T121-33 Accelerator pedal position 1 (G79)
OEM-T121-51 Wideband lambda pump (G39)
0V sensor
0V sensor
OEM-T121-82 Crank position sensor (G28)
OEM-T121-86 Camshaft position sensor (G40)
OEM-T121-53 MAF sensor signal (G70)
OEM-T121-101 Boost pressure sensor (G31)
OEM-T121-96 Injector 1 (N30)
OEM-T121-89 Injector 2 (N31)
OEM-T121-54 Road speed signal (VSS)
OEM-T121-55 Brake pedal switch (F)
GND
OEM-T121-97 Injector 3 (N32)
OEM-T121-88 Injector 4 (N33)
+12V ECU power supply
MAXXECUPRO-C2
MAXXECUPRO
H1Engine ground 3
H2Engine ground 3
H3Engine ground 3
GND
GND
GND
MAXXECUPRO-C3
MAXXECUPRO
A1DIN/VR 4
A2DIN/VR 5
A3DIN 6 (SWITCH)
A4DIN 7 (SWITCH)
B2WBO2 2 IP
B3WBO2 2 VS
C2+5V SENSOR SUPPLY 2
C3ANALOG IN 5 (0-5V)
D1ANALOG IN 6 (0-5V)
D2ANALOG IN 7 (0-5V)
D3ANALOG IN 8 (0-5V)
E1GPO 10/WBO2 2 HTR
E2ANALOG IN 9 (0-5V)
E3ANALOG IN 10 (0-5V)
F2ANALOG IN 11 (0-5V)
F3ANALOG IN 12 (0-5V)
J2SENSOR GND
J3SENSOR GND
K3KEY IN 12V
L2GPO 12/MOTOR 1 +
L3GPO 11/MOTOR 1 -
L4ENGINE GROUND 2
M412V ECU 2
OEM-T121-56 Brake pedal switch (F)
OEM-T121-57 Cruise control switch (E45)
OEM-T121-28 Alternator DF terminal (charge warning)
OEM-T121-38 Cruise control switch (E45)
OEM-T121-52 Wideband lambda pump (G39)
OEM-T121-71 Wideband lambda Nernst signal (G39)
5V ref
OEM-T121-84 Throttle position sensor 1 (G187)
OEM-T121-35 Accelerator pedal position 2 (G185)
OEM-T121-92 Throttle position sensor 2 (G188)
OEM-T121-68 Post-cat lambda signal (G130)
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-69 Post-cat lambda signal (G130)
OEM-T121-67 Crash sensor signal
OEM-T121-75 Cruise control switch (E45)
OEM-T121-76 Cruise control switch (E45)
0V sensor
0V sensor
OEM-T121-3 Ignition switch +12V (term 15)
OEM-T121-118 Throttle motor G186 (−)
OEM-T121-117 Throttle motor G186 (+)
GND
12V ECU 2
MAXXECUPRO-C4
MAXXECUPRO
A1CAN 2 H
A2CAN 2 L
D3DIN 8 (switch)
D4DIN 9 (switch)
E1DIN 10 (switch)
E2DIN 11 (switch)
E3+5V sensor supply 3
F2Knock 1
F3Knock 2
G1GPO 23
G2GPO 24
G3GPO 25
G4GPO 26
H1GPO 27
OEM-T121-60 CAN bus high
OEM-T121-58 CAN bus low
OEM-T121-39 Clutch pedal switch (F36)
OEM-T121-40 A/C signal
OEM-T121-41 A/C signal
OEM-T121-49 Power steering pressure switch (F88)
5V ref
OEM-T121-106 Knock sensor 1 (G61)
OEM-T121-107 Knock sensor 2 (G66)
OEM-T121-47 Check engine light (MIL)
OEM-T121-48 EPC warning light
OEM-T121-64 EVAP canister valve (N80)
OEM-T121-9 Secondary-air injection valve (N112)
OEM-T121-37 Engine speed signal (tacho to cluster)
SP-GND · 8 pins
SP-0V · 11 pins
SP-5V1 · 4 pins
SP-14V · 5 pins
SP-5V2 · 4 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.
87 / 87 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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