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
T2-C1-15 Lambda Heater Negative
ECM power (J271 relay feed)
0V sensor
T2-C1-23 Analogue 3
0V sensor
T2-C1-33 Analogue 5
0V sensor
T2-C1-5 Lambda Pump Current
T2-C1-20 Analogue 1
T2-C1-11 Digital 1
T2-C1-17 CAN Low
T2-C1-16 CAN High
Battery constant +12V (term 30)
T2-C1-18 PWM 3
T2-C1-1 PWM 1
T2-C1-10 PWM 2
T2-C1-2 Lambda Nernst Voltage
5V ref
5V ref
T2-C1-19 Crank
5V ref
T2-C1-25 Analogue 4
T2-C1-32 Thermistor 2
T2-C1-12 Wheel 1
T2-C1-9 Injector 2
T2-C1-9 Injector 2
0V sensor
0V sensor
T2-C1-34 Analogue 6
T2-C1-24 Thermistor 1
T2-C1-6 Coil 2
T2-C1-8 Injector 1
T2-C1-8 Injector 1
5V ref
5V ref
T2-C1-22 Analogue 2
T2-C1-3 Coil 1
T2-C1-26 PWM 4
0V sensor
ECM + coil power (J271 relay feed)
OEM-T121
Stock ECU being replaced
1ECU ground
2ECU ground
5Wideband lambda heater (Z19)
21ECM power (J271 relay feed)
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)
51Wideband lambda pump (G39)
53MAF sensor signal (G70)
54Road speed signal (VSS)
58CAN bus low
60CAN bus high
62Battery constant +12V (term 30)
63Post-cat lambda heater (Z29)
65Fuel pump relay control
66Secondary-air pump relay (J299)
70Wideband lambda Nernst signal (G39)
72Accelerator pedal position 1 5V supply (G79)
73Accelerator pedal position 2 5V supply (G185)
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)
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)
104Boost control solenoid (N75)
108Sensor ground
121ECM + coil power (J271 relay feed)
T2
T2-C1
T2
1PWM 1
2Lambda Nernst Voltage
3Coil 1
5Lambda Pump Current
6Coil 2
8Injector 1
9Injector 2
10PWM 2
11Digital 1
12Wheel 1
13Power Ground 1
14Power Ground 2
15Lambda Heater Negative
16CAN High
17CAN Low
18PWM 3
19Crank
20Analogue 1
21Permanent 12v
22Analogue 2
23Analogue 3
24Thermistor 1
25Analogue 4
26PWM 4
275v Output
28Sensor Ground
29Sensor Ground
31Ignition 12v In
32Thermistor 2
33Analogue 5
34Analogue 6
OEM-T121-65 Fuel pump relay control
OEM-T121-70 Wideband lambda Nernst signal (G39)
OEM-T121-102 Ignition coil 1 (N127)
OEM-T121-51 Wideband lambda pump (G39)
OEM-T121-95 Ignition coil 2 (N128)
Injector 1 · 2 pins
Injector 2 (N31) · 2 pins
OEM-T121-66 Secondary-air pump relay (J299)
OEM-T121-54 Road speed signal (VSS)
OEM-T121-86 Camshaft position sensor (G40)
GND
GND
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-60 CAN bus high
OEM-T121-58 CAN bus low
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-82 Crank position sensor (G28)
OEM-T121-53 MAF sensor signal (G70)
Permanent 12v
OEM-T121-101 Boost pressure sensor (G31)
OEM-T121-33 Accelerator pedal position 1 (G79)
OEM-T121-93 Engine coolant temperature (G62)
OEM-T121-84 Throttle position sensor 1 (G187)
OEM-T121-104 Boost control solenoid (N75)
5V ref
0V sensor
0V sensor
Ignition 12v In
OEM-T121-85 Intake air temperature (G42)
OEM-T121-35 Accelerator pedal position 2 (G185)
OEM-T121-92 Throttle position sensor 2 (G188)
SP-GND · 5 pins
SP-0V · 9 pins
SP-14V · 4 pins
SP-5V1 · 7 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.
48 / 48 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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