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
SL4-B-4 Ignition switch input
SL4-A-15 Auxiliary output 6
ECM power (J271 relay feed)
0V sensor
SL4-B-13 Analog input 3
0V sensor
SL4-B-15 Analog input 5
0V sensor
SL4-A-12 Auxiliary output 3
SL4-A-13 Auxiliary output 4
SL4-B-11 Analog input 1
SL4-A-20 Digital input 1
SL4-B-28 CAN 1 L
SL4-B-27 CAN 1 H
SL4-A-16 Auxiliary output 7
SL4-B-3 EFI relay output (low side, 200 mA)
SL4-A-14 Auxiliary output 5
SL4-B-21 Analog input 8 (switchable 1k pull-up)
SL4-B-22 Analog input 9 (switchable 1k pull-up)
5V ref
5V ref
SL4-B-5 Crank index sensor +
5V ref
SL4-B-14 Analog input 4
SL4-B-23 Analog input 10 (switchable 1k pull-up)
SL4-B-7 Sync sensor +
SL4-A-4 Injection channel 4
SL4-A-2 Injection channel 2
0V sensor
0V sensor
SL4-B-19 Analog input 6
SL4-B-20 Analog input 7 (switchable 1k pull-up)
SL4-A-29 Ignition channel 4
SL4-A-27 Ignition channel 2
SL4-A-1 Injection channel 1
SL4-A-3 Injection channel 3
5V ref
5V ref
SL4-B-12 Analog input 2
SL4-A-26 Ignition channel 1
SL4-A-28 Ignition channel 3
SL4-A-17 Auxiliary output 8
SL4-A-10 Auxiliary output 1
SL4-B-16 Knock 1 +
SL4-B-24 Knock 2 +
0V sensor
SL4-A-11 Auxiliary output 2
SL4-A-18 Auxiliary output 9
SL4-A-19 Auxiliary output 10
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)
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
53MAF sensor signal (G70)
54Road speed signal (VSS)
58CAN bus low
60CAN bus high
63Post-cat lambda heater (Z29)
65Fuel pump relay control
66Secondary-air pump relay (J299)
68Post-cat lambda signal (G130)
69Post-cat lambda signal (G130)
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)
SL4
SL4-A
SL4
1Injection channel 1
2Injection channel 2
3Injection channel 3
4Injection channel 4
5–8 no data
10Auxiliary output 1
11Auxiliary output 2
12Auxiliary output 3
13Auxiliary output 4
14Auxiliary output 5
15Auxiliary output 6
16Auxiliary output 7
17Auxiliary output 8
18Auxiliary output 9
19Auxiliary output 10
20Digital input 1
26Ignition channel 1
27Ignition channel 2
28Ignition channel 3
29Ignition channel 4
30–33 no data
34Aux 9–10 14V supply
OEM-T121-96 Injector 1 (N30)
OEM-T121-89 Injector 2 (N31)
OEM-T121-97 Injector 3 (N32)
OEM-T121-88 Injector 4 (N33)
5–8 no data
OEM-T121-105 Diverter valve (N249)
OEM-T121-115 VVT camshaft adjustment valve (N205)
OEM-T121-47 Check engine light (MIL)
OEM-T121-48 EPC warning light
OEM-T121-66 Secondary-air pump relay (J299)
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-104 Boost control solenoid (N75)
OEM-T121-117 Throttle motor G186 (+)
OEM-T121-118 Throttle motor G186 (−)
OEM-T121-54 Road speed signal (VSS)
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)
30–33 no data
Aux 9–10 14V supply
SL4-B
SL4
1ECU 14V supply
2Sensor supply Vref1 5.0V
3EFI relay output (low side, 200 mA)
4Ignition switch input
5Crank index sensor +
6Crank index sensor −
7Sync sensor +
8Sync sensor −
10Analog sensor 0V reference
11Analog input 1
12Analog input 2
13Analog input 3
14Analog input 4
15Analog input 5
16Knock 1 +
18ECU ground
19Analog input 6
20Analog input 7 (switchable 1k pull-up)
21Analog input 8 (switchable 1k pull-up)
22Analog input 9 (switchable 1k pull-up)
23Analog input 10 (switchable 1k pull-up)
24Knock 2 +
26ECU ground
27CAN 1 H
28CAN 1 L
29–30 no data
ECU 14V supply
5V ref
OEM-T121-65 Fuel pump relay control
OEM-T121-3 Ignition switch +12V (term 15)
OEM-T121-82 Crank position sensor (G28)
SP-0V · 6 pins
OEM-T121-86 Camshaft position sensor (G40)
SP-0V · 6 pins
0V sensor
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-T121-106 Knock sensor 1 (G61)
GND
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-T121-85 Intake air temperature (G42)
OEM-T121-107 Knock sensor 2 (G66)
GND
OEM-T121-60 CAN bus high
OEM-T121-58 CAN bus low
29–30 no data
SP-GND · 5 pins
SP-0V · 10 pins
SP-14V · 5 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.
60 / 60 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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