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
ECU power +14V (main relay)
MAIN-R-COIL+ Relay coil positive (ignition-switched +12V)
SPEEDUINO-A-35 Boost
SPEEDUINO-A-7 Ignition 1
SPEEDUINO-A-34 Ignition 2
SPEEDUINO-A-15 Proto area 2 (fan)
SPEEDUINO-A-18 Proto area 5 (clutch)
SPEEDUINO-A-14 Proto area 1 (flex fuel)
SPEEDUINO-A-36 Idle 2 (3-wire idle)
OEM-1
Stock ECU being replaced
BECU power +14V (main relay)
CIgnition on (+12V)
EMalfunction indicator lamp (MIL)
GIgnition 1 (coils 1+4, wasted spark)
HIgnition 2 (coils 2+3, wasted spark)
JA/C relay
KDiagnostic mode switch (TEN)
NWide-open throttle switch
RA/C extra cooling fan relay
GND
GND
0V sensor
0V sensor
SPEEDUINO-A-25 Crank input / VR1+
F no data
SPEEDUINO-A-24 Cam input / VR2+
SPEEDUINO-A-17 Proto area 4 (tachometer)
5V ref
SPEEDUINO-A-22 TPS input
SPEEDUINO-A-21 O2 sensor
SPEEDUINO-A-20 Inlet air temp (IAT)
SPEEDUINO-A-19 Coolant temp (CLT)
SPEEDUINO-A-1 Injector 1
SPEEDUINO-A-2 Injector 2
SPEEDUINO-A-37 PWM idle
SPEEDUINO-A-38 VVT
SPEEDUINO-A-3 Injector 3
SPEEDUINO-A-5 Injector 4
OEM-2
Stock ECU being replaced
APower ground
BPower ground
CSensor ground (E2)
DSensor ground (E2)
ECrank position (CAS NE)
F no data
GCam position (CAS G)
ITachometer output
K+5V sensor supply
MTPS signal (A/T)
NO2 sensor
PIntake air temperature (IAT)
QCoolant temperature (ECT)
UInjector 1 & 3 (batch)
VInjector 2 & 4 (batch)
WIdle speed control (ISC) valve
XPurge solenoid valve
YInjector 3 (California sequential)
ZInjector 4 (California sequential)
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
SPEEDUINO-PWR-12V Main power (+12 V switched)
Relay coil positive (ignition-switched +12V)
SP-GND · 4 pins
SPEEDUINO
SPEEDUINO-A
SPEEDUINO
1Injector 1
2Injector 2
3Injector 3
5Injector 4
7Ignition 1
9Ground
10Ground
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+
34Ignition 2
35Boost
36Idle 2 (3-wire idle)
37PWM idle
38VVT
OEM-2-U Injector 1 & 3 (batch)
OEM-2-V Injector 2 & 4 (batch)
OEM-2-Y Injector 3 (California sequential)
OEM-2-Z Injector 4 (California sequential)
OEM-1-G Ignition 1 (coils 1+4, wasted spark)
GND
GND
0V sensor
5V ref
OEM-1-N Wide-open throttle switch
OEM-1-J A/C relay
NEW-FUELPUMP
OEM-2-I Tachometer output
OEM-1-K Diagnostic mode switch (TEN)
OEM-2-Q Coolant temperature (ECT)
OEM-2-P Intake air temperature (IAT)
OEM-2-N O2 sensor
OEM-2-M TPS signal (A/T)
0V sensor
OEM-2-G Cam position (CAS G)
OEM-2-E Crank position (CAS NE)
OEM-1-H Ignition 2 (coils 2+3, wasted spark)
OEM-1-E Malfunction indicator lamp (MIL)
OEM-1-R A/C extra cooling fan relay
OEM-2-W Idle speed control (ISC) valve
OEM-2-X Purge solenoid valve
SPEEDUINO-PWR
SPEEDUINO
12VMain power (+12 V switched)
Main power (+12 V switched)
◯New feed: NEW-BATT
SP-14V · 2 pins
SP-GND · 6 pins
SP-0V · 5 pins
◯New feed: NEW-FUELPUMP
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.
35 / 35 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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