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
ME221-C1-16 LSU HEATER -VE
ECM power (J271 relay feed)
ME221-C1-72 LOW SIDE RELAY 13
ME221-C1-44 LOW SIDE 4
ME221-C1-7 DIG_IN 2
0V sensor
ME221-C1-17 ANA VOLT 3
0V sensor
0V sensor
ME221-C1-79 TACHOMETER
ME221-C1-43 LOW SIDE RELAY 14
ME221-C1-50 LSU IP
ME221-C1-26 ANA VOLT 1
ME221-C1-6 DIG_IN 1
ME221-C1-51 CAN 1 LOW
ME221-C1-21 CAN 1 HIGH
ME221-C1-74 LOW SIDE 3
ME221-C1-73 LOW SIDE 1
ME221-C1-12 LOW SIDE 2
ME221-C1-19 LSU UN
5V ref
5V ref
ME221-C1-69 LOW SIDE 5
ME221-C1-80 CRANK VR+
5V ref
ME221-C1-18 ANA VOLT 4
ME221-C1-57 ANA TEMP 2
ME221-C1-22 CAM A VR+
ME221-C1-3 INJECTOR 4
ME221-C1-4 INJECTOR 2
0V sensor
0V sensor
ME221-C1-86 ANA TEMP 1
ME221-C1-1 COIL 4
ME221-C1-31 COIL 2
ME221-C1-63 INJECTOR 1
ME221-C1-33 INJECTOR 3
5V ref
5V ref
ME221-C1-56 ANA VOLT 2
ME221-C1-32 COIL 1
ME221-C1-2 COIL 3
ME221-C1-39 LOW SIDE 6
ME221-C1-37 LOW SIDE RELAY 11
ME221-C1-53 KNOCK 1 SIGNAL
0V sensor
ME221-C1-42 LOW SIDE RELAY 12
ME221-C1-67 Stepper 1 / A1
ME221-C1-68 Stepper 2 / A2
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)
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)
36Accelerator pedal position 2 ground (G185)
37Engine speed signal (tacho to cluster)
47Check engine light (MIL)
51Wideband lambda pump (G39)
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)
70Wideband lambda Nernst signal (G39)
72Accelerator pedal position 1 5V supply (G79)
73Accelerator pedal position 2 5V supply (G185)
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)
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)
108Sensor ground
115VVT camshaft adjustment valve (N205)
117Throttle motor G186 (+)
118Throttle motor G186 (−)
121ECM + coil power (J271 relay feed)
ME221
ME221-C1
ME221
1COIL 4
2COIL 3
3INJECTOR 4
4INJECTOR 2
6DIG_IN 1
7DIG_IN 2
10GROUND CHASSIS
12LOW SIDE 2
15IGN +12V
16LSU HEATER -VE
17ANA VOLT 3
18ANA VOLT 4
19LSU UN
21CAN 1 HIGH
22CAM A VR+
26ANA VOLT 1
31COIL 2
32COIL 1
33INJECTOR 3
37LOW SIDE RELAY 11
39LOW SIDE 6
42LOW SIDE RELAY 12
43LOW SIDE RELAY 14
44LOW SIDE 4
455V REF
465V REF
50LSU IP
51CAN 1 LOW
52SENSORS GROUND
53KNOCK 1 SIGNAL
56ANA VOLT 2
57ANA TEMP 2
61GROUND
63INJECTOR 1
64VBAT
67Stepper 1 / A1
68Stepper 2 / A2
69LOW SIDE 5
72LOW SIDE RELAY 13
73LOW SIDE 1
74LOW SIDE 3
765V REF
79TACHOMETER
80CRANK VR+
84Sensor Ground
86ANA TEMP 1
89GROUND
90GROUND
OEM-T121-94 Ignition coil 4 (N163)
OEM-T121-103 Ignition coil 3 (N158)
OEM-T121-88 Injector 4 (N33)
OEM-T121-89 Injector 2 (N31)
OEM-T121-54 Road speed signal (VSS)
OEM-T121-28 Alternator DF terminal (charge warning)
GND
OEM-T121-66 Secondary-air pump relay (J299)
IGN +12V
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-33 Accelerator pedal position 1 (G79)
OEM-T121-84 Throttle position sensor 1 (G187)
OEM-T121-70 Wideband lambda Nernst signal (G39)
OEM-T121-60 CAN bus high
OEM-T121-86 Camshaft position sensor (G40)
OEM-T121-53 MAF sensor signal (G70)
OEM-T121-95 Ignition coil 2 (N128)
OEM-T121-102 Ignition coil 1 (N127)
OEM-T121-97 Injector 3 (N32)
OEM-T121-105 Diverter valve (N249)
OEM-T121-104 Boost control solenoid (N75)
OEM-T121-115 VVT camshaft adjustment valve (N205)
OEM-T121-47 Check engine light (MIL)
OEM-T121-25 V144 Evaporative diagnostic pump (Pin 2)
5V ref
5V ref
OEM-T121-51 Wideband lambda pump (G39)
OEM-T121-58 CAN bus low
0V sensor
OEM-T121-106 Knock sensor 1 (G61)
OEM-T121-101 Boost pressure sensor (G31)
OEM-T121-85 Intake air temperature (G42)
GND
OEM-T121-96 Injector 1 (N30)
VBAT
OEM-T121-117 Throttle motor G186 (+)
OEM-T121-118 Throttle motor G186 (−)
OEM-T121-80 V144 Evap Diagnostic Pump (Pin 1)
OEM-T121-22 Brake vacuum pump (V192)
OEM-T121-65 Fuel pump relay control
OEM-T121-63 Post-cat lambda heater (Z29)
5V ref
OEM-T121-37 Engine speed signal (tacho to cluster)
OEM-T121-82 Crank position sensor (G28)
0V sensor
OEM-T121-93 Engine coolant temperature (G62)
GND
GND
SP-GND · 7 pins
SP-14V · 5 pins
SP-0V · 9 pins
SP-5V1 · 4 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.
62 / 62 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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