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)
M170-A-24 Peak Hold Injector 5
ECM power (J271 relay feed)
M170-A-57 Peak Hold Injector 7
M170-A-45 Universal Digital Input 4
0V sensor
M170-A-6 Analogue Voltage Input 3
0V sensor
M170-A-12 Analogue Voltage Input 5
0V sensor
M170-A-52 Universal Digital Input 5
M170-A-53 Universal Digital Input 6
M170-A-13 Universal Digital Input 7
M170-A-22 Universal Digital Input 8
M170-A-26 Analogue Voltage Input 1
M170-A-46 Universal Digital Input 3
M170-A-31 CAN Bus 1 Low
M170-A-40 CAN Bus 1 High
Battery constant +12V (term 30)
M170-A-42 Peak Hold Injector 6
M170-A-63 Peak Hold Injector 3
M170-A-66 Peak Hold Injector 4
M170-A-35 Analogue Voltage Input 7
M170-A-44 Analogue Voltage Input 8
5V ref
5V ref
M170-A-62 Peak Hold Injector 8
M170-A-49 Universal Digital Input 1
5V ref
M170-A-7 Analogue Voltage Input 4
M170-A-38 Analogue Temperature Input 2
M170-A-56 Universal Digital Input 2
M170-A-51 Low Side Injector 2
M170-A-43 Low Side Injector 1
0V sensor
0V sensor
M170-A-36 Analogue Voltage Input 6
M170-A-28 Analogue Temperature Input 1
M170-A-10 Low Side Ignition 4
M170-A-5 Low Side Ignition 2
M170-A-33 Peak Hold Injector 1
M170-A-50 Peak Hold Injector 2
5V ref
5V ref
M170-A-18 Analogue Voltage Input 2
M170-A-1 Low Side Ignition 1
M170-A-4 Low Side Ignition 3
M170-A-29 Knock Input 1
M170-A-60 Knock Input 2
0V sensor
M170-A-9 Half Bridge Output 1
M170-A-8 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)
21ECM power (J271 relay feed)
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
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)
68Post-cat lambda signal (G130)
69Post-cat lambda signal (G130)
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)
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)
106Knock sensor 1 (G61)
107Knock sensor 2 (G66)
108Sensor ground
117Throttle motor G186 (+)
118Throttle motor G186 (−)
121ECM + coil power (J271 relay feed)
M170
M170-A
M170
1Low Side Ignition 1
4Low Side Ignition 3
5Low Side Ignition 2
6Analogue Voltage Input 3
7Analogue Voltage Input 4
8Half Bridge Output 2
9Half Bridge Output 1
10Low Side Ignition 4
11Sensor 0V A
12Analogue Voltage Input 5
13Universal Digital Input 7
14Battery Negative 1
15Battery Negative 2
16Sensor 5.0V A
18Analogue Voltage Input 2
19Battery Negative 3
20Battery Negative 4
21Battery Negative 5
22Universal Digital Input 8
23Battery Positive
24Peak Hold Injector 5
26Analogue Voltage Input 1
27Sensor 0V B
28Analogue Temperature Input 1
29Knock Input 1
31CAN Bus 1 Low
32Battery Positive
33Peak Hold Injector 1
34Sensor 5.0V B
35Analogue Voltage Input 7
36Analogue Voltage Input 6
38Analogue Temperature Input 2
40CAN Bus 1 High
41Battery Positive
42Peak Hold Injector 6
43Low Side Injector 1
44Analogue Voltage Input 8
45Universal Digital Input 4
46Universal Digital Input 3
49Universal Digital Input 1
50Peak Hold Injector 2
51Low Side Injector 2
52Universal Digital Input 5
53Universal Digital Input 6
54Battery Backup
56Universal Digital Input 2
57Peak Hold Injector 7
60Knock Input 2
62Peak Hold Injector 8
63Peak Hold Injector 3
66Peak Hold Injector 4
OEM-T121-102 Ignition coil 1 (N127)
OEM-T121-103 Ignition coil 3 (N158)
OEM-T121-95 Ignition coil 2 (N128)
OEM-T121-33 Accelerator pedal position 1 (G79)
OEM-T121-84 Throttle position sensor 1 (G187)
OEM-T121-118 Throttle motor G186 (−)
OEM-T121-117 Throttle motor G186 (+)
OEM-T121-94 Ignition coil 4 (N163)
0V sensor
OEM-T121-35 Accelerator pedal position 2 (G185)
OEM-T121-40 A/C signal
GND
GND
5V ref
OEM-T121-101 Boost pressure sensor (G31)
GND
GND
GND
OEM-T121-41 A/C signal
Battery Positive
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-53 MAF sensor signal (G70)
0V sensor
OEM-T121-93 Engine coolant temperature (G62)
OEM-T121-106 Knock sensor 1 (G61)
OEM-T121-58 CAN bus low
Battery Positive
OEM-T121-96 Injector 1 (N30)
5V ref
OEM-T121-68 Post-cat lambda signal (G130)
OEM-T121-92 Throttle position sensor 2 (G188)
OEM-T121-85 Intake air temperature (G42)
OEM-T121-60 CAN bus high
Battery Positive
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-89 Injector 2 (N31)
OEM-T121-69 Post-cat lambda signal (G130)
OEM-T121-28 Alternator DF terminal (charge warning)
OEM-T121-54 Road speed signal (VSS)
OEM-T121-82 Crank position sensor (G28)
OEM-T121-97 Injector 3 (N32)
OEM-T121-88 Injector 4 (N33)
OEM-T121-38 Cruise control switch (E45)
OEM-T121-39 Clutch pedal switch (F36)
Battery Backup
OEM-T121-86 Camshaft position sensor (G40)
OEM-T121-25 V144 Evaporative diagnostic pump (Pin 2)
OEM-T121-107 Knock sensor 2 (G66)
OEM-T121-80 V144 Evap Diagnostic Pump (Pin 1)
OEM-T121-65 Fuel pump relay control
OEM-T121-66 Secondary-air pump relay (J299)
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 · 9 pins
SP-5V1 · 5 pins
SP-14V · 3 pins
SP-5V2 · 4 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.
69 / 69 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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