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
NEXUSS3-A-13 Ignition switch input
NEXUSS3-C-33 WBI 1 Heater -
NEXUSS3-A-7 Injector 7
ECM power (J271 relay feed)
0V sensor
NEXUSS3-C-12 AVI 3
0V sensor
NEXUSS3-C-14 AVI 5
0V sensor
NEXUSS3-A-17 DPO 6
NEXUSS3-A-5 Injector 5
NEXUSS3-C-31 WBI 1 Pump
NEXUSS3-C-10 AVI 1
NEXUSS3-C-5 SPI 1
NEXUSS3-A-24 CAN 1 Low
NEXUSS3-A-23 CAN 1 High
NEXUSS3-A-12 DPO 2
NEXUSS3-A-6 Injector 6
NEXUSS3-A-26 ECR output
NEXUSS3-A-9 DPO 1
NEXUSS3-C-17 AVI 8
NEXUSS3-C-18 AVI 9
NEXUSS3-C-32 WBI 1 Nernst
5V ref
5V ref
NEXUSS3-C-1 Trigger +
5V ref
NEXUSS3-C-13 AVI 4
NEXUSS3-C-27 AVI 10
NEXUSS3-C-3 Home +
NEXUSS3-A-4 Injector 4
NEXUSS3-A-2 Injector 2
0V sensor
0V sensor
NEXUSS3-C-15 AVI 6
NEXUSS3-C-16 AVI 7
NEXUSS3-A-30 Ignition 4
NEXUSS3-A-28 Ignition 2
NEXUSS3-A-1 Injector 1
NEXUSS3-A-3 Injector 3
5V ref
5V ref
NEXUSS3-C-11 AVI 2
NEXUSS3-A-27 Ignition 1
NEXUSS3-A-29 Ignition 3
NEXUSS3-A-14 DPO 3
NEXUSS3-A-15 DPO 4
NEXUSS3-C-23 Knock 1
NEXUSS3-C-24 Knock 2
0V sensor
NEXUSS3-A-16 DPO 5
NEXUSS3-A-19 HBO 1
NEXUSS3-A-20 HBO 2
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)
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)
47Check engine light (MIL)
48EPC warning light
51Wideband lambda pump (G39)
53MAF sensor signal (G70)
54Road speed signal (VSS)
58CAN bus low
60CAN bus high
63Post-cat lambda heater (Z29)
64EVAP canister valve (N80)
65Fuel pump relay control
66Secondary-air pump relay (J299)
68Post-cat lambda signal (G130)
69Post-cat lambda signal (G130)
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)
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)
NEXUSS3
NEXUSS3-A
NEXUSS3
1Injector 1
2Injector 2
3Injector 3
4Injector 4
5Injector 5
6Injector 6
7Injector 7
9DPO 1
10Battery ground
11Battery ground
12DPO 2
13Ignition switch input
14DPO 3
15DPO 4
16DPO 5
17DPO 6
18+12V switched input
19HBO 1
20HBO 2
23CAN 1 High
24CAN 1 Low
25+12V switched input
26ECR output
27Ignition 1
28Ignition 2
29Ignition 3
30Ignition 4
OEM-T121-96 Injector 1 (N30)
OEM-T121-89 Injector 2 (N31)
OEM-T121-97 Injector 3 (N32)
OEM-T121-88 Injector 4 (N33)
OEM-T121-48 EPC warning light
OEM-T121-64 EVAP canister valve (N80)
OEM-T121-9 Secondary-air injection valve (N112)
OEM-T121-66 Secondary-air pump relay (J299)
GND
GND
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-3 Ignition switch +12V (term 15)
OEM-T121-104 Boost control solenoid (N75)
OEM-T121-105 Diverter valve (N249)
OEM-T121-115 VVT camshaft adjustment valve (N205)
OEM-T121-47 Check engine light (MIL)
+12V switched input
OEM-T121-117 Throttle motor G186 (+)
OEM-T121-118 Throttle motor G186 (−)
OEM-T121-60 CAN bus high
OEM-T121-58 CAN bus low
+12V switched input
OEM-T121-65 Fuel pump relay control
OEM-T121-102 Ignition coil 1 (N127)
OEM-T121-95 Ignition coil 2 (N128)
OEM-T121-103 Ignition coil 3 (N158)
OEM-T121-94 Ignition coil 4 (N163)
NEXUSS3-C
NEXUSS3
1Trigger +
2Trigger -
3Home +
4Home -
5SPI 1
10AVI 1
11AVI 2
12AVI 3
13AVI 4
14AVI 5
15AVI 6
16AVI 7
17AVI 8
18AVI 9
23Knock 1
24Knock 2
25+5V
26Signal ground
27AVI 10
31WBI 1 Pump
32WBI 1 Nernst
33WBI 1 Heater -
OEM-T121-82 Crank position sensor (G28)
SP-0V · 6 pins
OEM-T121-86 Camshaft position sensor (G40)
SP-0V · 6 pins
OEM-T121-54 Road speed signal (VSS)
OEM-T121-53 MAF sensor signal (G70)
OEM-T121-101 Boost pressure sensor (G31)
OEM-T121-33 Accelerator pedal position 1 (G79)
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-T121-93 Engine coolant temperature (G62)
OEM-T121-68 Post-cat lambda signal (G130)
OEM-T121-69 Post-cat lambda signal (G130)
OEM-T121-106 Knock sensor 1 (G61)
OEM-T121-107 Knock sensor 2 (G66)
5V ref
0V sensor
OEM-T121-85 Intake air temperature (G42)
OEM-T121-51 Wideband lambda pump (G39)
OEM-T121-70 Wideband lambda Nernst signal (G39)
OEM-T121-5 Wideband lambda heater (Z19)
SP-GND · 5 pins
SP-14V · 5 pins
SP-0V · 10 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.
64 / 64 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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