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
MAIN-R-COIL+ Relay coil positive (ignition-switched +12V)
M150-B-8 Low Side Injector 5
M150-B-25 Peak Hold Injector 12
ECM power (J271 relay feed)
M150-C-30 Peak Hold Injector 8
M150-C-21 Peak Hold Injector 3
M150-A-23 Digital Input 1
0V sensor
M150-C-16 Analogue Voltage Input 3
0V sensor
M150-C-25 Analogue Voltage Input 5
0V sensor
M150-A-15 Digital Input 2
M150-A-16 Digital Input 3
M150-A-17 Digital Input 4
M150-D-9 Universal Digital Input 4
M150-B-22 Peak Hold Injector 9
M150-B-23 Peak Hold Injector 10
M150-D-10 Universal Digital Input 5
M150-C-14 Analogue Voltage Input 1
M150-D-8 Universal Digital Input 3
M150-D-11 Universal Digital Input 6
M150-D-14 Universal Digital Input 7
M150-B-3 Universal Digital Input 8
M150-D-18 CAN Bus 1 Low
M150-D-17 CAN Bus 1 High
Battery constant +12V (term 30)
M150-B-14 Low Side Injector 6
M150-B-24 Peak Hold Injector 11
M150-B-9 Low Side Injector 3
M150-B-15 Low Side Injector 4
M150-B-4 Universal Digital Input 9
M150-A-11 Lambda Narrow Input 1
M150-A-12 Lambda Narrow Input 2
5V ref
5V ref
M150-B-5 Universal Digital Input 10
M150-B-6 Universal Digital Input 11
M150-C-22 Peak Hold Injector 4
M150-D-1 Universal Digital Input 1
5V ref
M150-C-17 Analogue Voltage Input 4
M150-D-4 Analogue Temperature Input 2
M150-D-2 Universal Digital Input 2
M150-C-24 Low Side Injector 2
M150-C-23 Low Side Injector 1
0V sensor
0V sensor
M150-D-20 Analogue Voltage Input 6
M150-D-3 Analogue Temperature Input 1
M150-C-6 Low Side Ignition 4
M150-C-4 Low Side Ignition 2
M150-C-19 Peak Hold Injector 1
M150-C-20 Peak Hold Injector 2
5V ref
5V ref
M150-C-15 Analogue Voltage Input 2
M150-C-3 Low Side Ignition 1
M150-C-5 Low Side Ignition 3
M150-C-27 Peak Hold Injector 5
M150-C-28 Peak Hold Injector 6
M150-D-7 Knock Input 1
M150-D-13 Knock Input 2
0V sensor
M150-C-29 Peak Hold Injector 7
M150-C-18 Half Bridge Output 1
M150-C-1 Half Bridge Output 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)
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)
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)
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
62Battery constant +12V (term 30)
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)
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)
M150
M150-A
M150
10Sensor 5.0V C1
11Lambda Narrow Input 1
12Lambda Narrow Input 2
15Digital Input 2
16Digital Input 3
17Digital Input 4
18Sensor 5.0V C2
19Sensor 5.0V B2
23Digital Input 1
24Battery Negative 3
25Battery Negative 4
26Sensor 0V C1
27Sensor 0V C2
32Battery Negative 5
33Sensor 0V B1
34Sensor 0V A1
5V ref
OEM-T121-68 Post-cat lambda signal (G130)
OEM-T121-69 Post-cat lambda signal (G130)
OEM-T121-38 Cruise control switch (E45)
OEM-T121-39 Clutch pedal switch (F36)
OEM-T121-40 A/C signal
5V ref
5V ref
OEM-T121-28 Alternator DF terminal (charge warning)
GND
GND
0V sensor
0V sensor
GND
0V sensor
0V sensor
M150-B
M150
3Universal Digital Input 8
4Universal Digital Input 9
5Universal Digital Input 10
6Universal Digital Input 11
8Low Side Injector 5
9Low Side Injector 3
13Battery Positive
14Low Side Injector 6
15Low Side Injector 4
19Battery Positive
22Peak Hold Injector 9
23Peak Hold Injector 10
24Peak Hold Injector 11
25Peak Hold Injector 12
26Sensor 5.0V A
OEM-T121-57 Cruise control switch (E45)
OEM-T121-67 Crash sensor signal
OEM-T121-75 Cruise control switch (E45)
OEM-T121-76 Cruise control switch (E45)
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-65 Fuel pump relay control
Battery Positive
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-66 Secondary-air pump relay (J299)
Battery Positive
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)
5V ref
M150-C
M150
1Half Bridge Output 2
2Sensor 5.0V A
3Low Side Ignition 1
4Low Side Ignition 2
5Low Side Ignition 3
6Low Side Ignition 4
10Battery Negative 1
11Battery Negative 2
14Analogue Voltage Input 1
15Analogue Voltage Input 2
16Analogue Voltage Input 3
17Analogue Voltage Input 4
18Half Bridge Output 1
19Peak Hold Injector 1
20Peak Hold Injector 2
21Peak Hold Injector 3
22Peak Hold Injector 4
23Low Side Injector 1
24Low Side Injector 2
25Analogue Voltage Input 5
26Battery Positive
27Peak Hold Injector 5
28Peak Hold Injector 6
29Peak Hold Injector 7
30Peak Hold Injector 8
OEM-T121-118 Throttle motor G186 (−)
5V ref
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)
GND
GND
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-T121-117 Throttle motor G186 (+)
OEM-T121-96 Injector 1 (N30)
OEM-T121-97 Injector 3 (N32)
OEM-T121-25 V144 Evaporative diagnostic pump (Pin 2)
OEM-T121-80 V144 Evap Diagnostic Pump (Pin 1)
OEM-T121-89 Injector 2 (N31)
OEM-T121-88 Injector 4 (N33)
OEM-T121-35 Accelerator pedal position 2 (G185)
Battery Positive
OEM-T121-104 Boost control solenoid (N75)
OEM-T121-105 Diverter valve (N249)
OEM-T121-115 VVT camshaft adjustment valve (N205)
OEM-T121-22 Brake vacuum pump (V192)
M150-D
M150
1Universal Digital Input 1
2Universal Digital Input 2
3Analogue Temperature Input 1
4Analogue Temperature Input 2
7Knock Input 1
8Universal Digital Input 3
9Universal Digital Input 4
10Universal Digital Input 5
11Universal Digital Input 6
12Battery Backup
13Knock Input 2
14Universal Digital Input 7
15Sensor 0V A
16Sensor 0V B
17CAN Bus 1 High
18CAN Bus 1 Low
20Analogue Voltage Input 6
OEM-T121-82 Crank position sensor (G28)
OEM-T121-86 Camshaft position sensor (G40)
OEM-T121-93 Engine coolant temperature (G62)
OEM-T121-85 Intake air temperature (G42)
OEM-T121-106 Knock sensor 1 (G61)
OEM-T121-54 Road speed signal (VSS)
OEM-T121-41 A/C signal
OEM-T121-49 Power steering pressure switch (F88)
OEM-T121-55 Brake pedal switch (F)
Battery Backup
OEM-T121-107 Knock sensor 2 (G66)
OEM-T121-56 Brake pedal switch (F)
0V sensor
0V sensor
OEM-T121-60 CAN bus high
OEM-T121-58 CAN bus low
OEM-T121-92 Throttle position sensor 2 (G188)
MAIN
MAIN-R
MAIN
INRelay contact input (battery + via main fuse)
OUTRelay contact output (switched +12V bus)
COIL+Relay coil positive (ignition-switched +12V)
COIL-Relay coil negative (ECU low-side driver)
NEW-BATT
Battery Positive · 3 pins
Relay coil positive (ignition-switched +12V)
SP-GND · 7 pins
SP-GND · 9 pins
SP-0V · 13 pins
SP-14V · 3 pins
◯New feed: NEW-BATT
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.
86 / 86 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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