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
5 no data
7–8 no data
SPEEDUINO-A-14 Proto area 1 (flex fuel)
11 no data
14 no data
SPEEDUINO-A-16 Proto area 3 (fuel pump)
SPEEDUINO-A-36 Idle 2 (3-wire idle)
SPEEDUINO-A-35 Boost
SPEEDUINO-A-17 Proto area 4 (tachometer)
SPEEDUINO-A-37 PWM idle
22 no data
SPEEDUINO-A-21 O2 sensor
SPEEDUINO-A-38 VVT
31 no data
OEM-A
Stock ECU being replaced
5 no data
7–8 no data
9Vehicle speed sensor
11 no data
14 no data
15Fuel pump relay (USDM)
16Fuel pump relay (JDM)
17A/C clutch relay
19Tacho output
20Radiator fan relay
22 no data
23Secondary O2 sensor
28Air pump relay
31 no data
Power source 1 (main relay)
GND
SPEEDUINO-A-2 Injector 2
SPEEDUINO-A-3 Injector 3
SPEEDUINO-A-5 Injector 4
6–8 no data
Power source 2 (main relay)
GND
SPEEDUINO-A-1 Injector 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
13–19 no data
GND
GND
24–25 no data
OEM-B
Stock ECU being replaced
1Power source 1 (main relay)
2Power ground 1
3Injector 2
4Injector 3
5Injector 4
6–8 no data
9Power source 2 (main relay)
10Power ground 2
11Injector 1
12VTEC solenoid
13–19 no data
20Ground
22Ground
24–25 no data
SPEEDUINO-A-7 Ignition 1
SPEEDUINO-A-18 Proto area 5 (clutch)
6 no data
0V sensor
SPEEDUINO-A-25 Crank input / VR1+
SP-0V · 2 pins
SPEEDUINO-A-34 Ignition 2
SPEEDUINO-A-33 Ignition 3
SPEEDUINO-A-8 Ignition 4
SPEEDUINO-A-11 MAP sensor (0-5V)
0V sensor
5V ref
SPEEDUINO-A-24 Cam input / VR2+
SP-0V · 2 pins
23 no data
SPEEDUINO-A-20 Inlet air temp (IAT)
SPEEDUINO-A-19 Coolant temp (CLT)
SPEEDUINO-A-22 TPS input
5V ref
SPEEDUINO-A-26 VR2-
0V sensor
0V sensor
OEM-C
Stock ECU being replaced
4Ignition coil 1
5Alternator FR signal
6 no data
7Sensor ground 1
8Crank sensor + (CKP+)
9Crank sensor − (CKP−)
12Ignition coil 2
13Ignition coil 3
14Ignition coil 4
17MAP sensor
18Sensor ground 2
19Sensor 5V supply 1 (MAP)
20Cam (TDC1) sensor +
21Cam (TDC1) sensor −
23 no data
25Intake air temp sensor
26Coolant temp sensor
27Throttle position sensor
28Sensor 5V supply 2
29Cam (TDC2) sensor +
30Cam (TDC2) sensor −
31Timing ground
1–16 no data
OEM-D
Stock ECU being replaced
1–16 no data
RLY1
RLY1-R
RLY1
INRelay contact input (switched +12 V)
OUTRelay contact output (switched +12 V to load)
COIL+Relay coil positive (switched +12 V)
COIL-Relay coil negative (ECU low-side driver)
SP-14V · 3 pins
OEM-B-12 VTEC solenoid
Relay coil positive (switched +12 V)
SPEEDUINO-A-15 Proto area 2 (fan)
SPEEDUINO
SPEEDUINO-A
SPEEDUINO
1Injector 1
2Injector 2
3Injector 3
5Injector 4
7Ignition 1
8Ignition 4
9Ground
10Ground
11MAP sensor (0-5V)
12Ground
135V
14Proto area 1 (flex fuel)
15Proto area 2 (fan)
16Proto area 3 (fuel pump)
17Proto area 4 (tachometer)
18Proto area 5 (clutch)
19Coolant temp (CLT)
20Inlet air temp (IAT)
21O2 sensor
22TPS input
23Ground
24Cam input / VR2+
25Crank input / VR1+
26VR2-
285V
33Ignition 3
34Ignition 2
35Boost
36Idle 2 (3-wire idle)
37PWM idle
38VVT
OEM-B-11 Injector 1
OEM-B-3 Injector 2
OEM-B-4 Injector 3
OEM-B-5 Injector 4
OEM-C-4 Ignition coil 1
OEM-C-14 Ignition coil 4
GND
GND
OEM-C-17 MAP sensor
0V sensor
5V ref
OEM-A-9 Vehicle speed sensor
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-A-15 Fuel pump relay (USDM)
OEM-A-19 Tacho output
OEM-C-5 Alternator FR signal
OEM-C-26 Coolant temp sensor
OEM-C-25 Intake air temp sensor
OEM-A-23 Secondary O2 sensor
OEM-C-27 Throttle position sensor
0V sensor
OEM-C-20 Cam (TDC1) sensor +
OEM-C-8 Crank sensor + (CKP+)
OEM-C-29 Cam (TDC2) sensor +
5V ref
OEM-C-13 Ignition coil 3
OEM-C-12 Ignition coil 2
OEM-A-17 A/C clutch relay
OEM-A-16 Fuel pump relay (JDM)
OEM-A-20 Radiator fan relay
OEM-A-28 Air pump relay
SPEEDUINO-PWR
SPEEDUINO
12VMain power (+12 V switched)
Main power (+12 V switched)
SP-14V · 6 pins
SP-GND · 7 pins
SP-0V · 9 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.
47 / 47 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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