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
Ignition power 2
Ignition power 1
GND
GND
MICROSQUIRT-A-4 VR2+
MICROSQUIRT-A-32 VR1+
GND
GND
11–12 no data
MICROSQUIRT-A-12 SPK A (IGN 1)
MICROSQUIRT-A-11 SPK B (IGN2)
17 no data
MICROSQUIRT-A-30 OPTO+
19 no data
5V ref
5V ref
22 no data
0V sensor
0V sensor
MICROSQUIRT-A-27 TPS
MICROSQUIRT-A-5 SPAREADC2 (MAF)
27 no data
29 no data
MICROSQUIRT-A-24 MAP
OEM-A
Stock ECU being replaced
2Ignition power 2
3Ignition power 1
4Power ground 2
5Power ground 1
6Cam position sensor (T2)
7Crank position sensor (T1)
8Logic ground 2
9Logic ground 1
11–12 no data
15Ignition coil 2
16Ignition coil 1
17 no data
18Vehicle speed sensor
19 no data
20Sensor voltage 2
21Sensor voltage 1
22 no data
23Sensor ground 2
24Sensor ground 1
25Accelerator pedal position B
26Accelerator pedal position A
27 no data
29 no data
30MAP sensor
1 no data
MICROSQUIRT-A-10 INJ 2
MICROSQUIRT-A-9 INJ 1
MICROSQUIRT-A-10 INJ 2
MICROSQUIRT-A-9 INJ 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
7 no data
MICROSQUIRT-A-25 CLT
9 no data
MICROSQUIRT-A-31 OPTO-
12 no data
14 no data
16 no data
22–24 no data
OEM-B
Stock ECU being replaced
1 no data
2Injector 4
3Injector 3
4Injector 2
5Injector 1
6VTEC solenoid
7 no data
8Coolant temp sensor
9 no data
11VTEC oil pressure switch
12 no data
14 no data
16 no data
22–24 no data
MICROSQUIRT-A-6 FLEX
2–3 no data
5–6 no data
10–14 no data
MICROSQUIRT-A-7 FIDLE
16–17 no data
OEM-D
Stock ECU being replaced
1Cruise set switch
2–3 no data
5–6 no data
10–14 no data
15Throttle actuator relay
16–17 no data
MICROSQUIRT-A-26 MAT
2 no data
GND
0V sensor
5V ref
6 no data
MICROSQUIRT-A-16 ALED
10 no data
MICROSQUIRT-A-2 CANH
MICROSQUIRT-A-8 FP (pump)
MICROSQUIRT-A-34 O2
23 no data
MICROSQUIRT-A-3 CANL
MICROSQUIRT-A-35 TACHO
31 no data
OEM-E
Stock ECU being replaced
1Coolant temp sensor 2
2 no data
3Logic ground 3
4Sensor ground 3
5Sensor voltage 3
6 no data
7Main relay control
10 no data
11CAN H
17Fuel pump relay
20Secondary O2 sensor
23 no data
24CAN L
25Engine speed pulse (tacho)
31 no data
MICROSQUIRT
MICROSQUIRT-A
MICROSQUIRT
1+12V In
2CANH
3CANL
4VR2+
5SPAREADC2 (MAF)
6FLEX
7FIDLE
8FP (pump)
9INJ 1
10INJ 2
11SPK B (IGN2)
12SPK A (IGN 1)
16ALED
17WLED
18Sensor Ground
19Serial Ground
20Sensor Ground
22POWER GROUND
23POWER GROUND
24MAP
25CLT
26MAT
27TPS
28TPS VREF (5V)
29SPAREADC
30OPTO+
31OPTO-
32VR1+
34O2
35TACHO
+12V In
OEM-E-11 CAN H
OEM-E-24 CAN L
OEM-A-6 Cam position sensor (T2)
OEM-A-26 Accelerator pedal position A
OEM-D-1 Cruise set switch
OEM-D-15 Throttle actuator relay
OEM-E-17 Fuel pump relay
Injector 3 · 2 pins
INJ 2 · 2 pins
OEM-A-16 Ignition coil 1
OEM-A-15 Ignition coil 2
OEM-E-7 Main relay control
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
0V sensor
0V sensor
0V sensor
GND
GND
OEM-A-30 MAP sensor
OEM-B-8 Coolant temp sensor
OEM-E-1 Coolant temp sensor 2
OEM-A-25 Accelerator pedal position B
5V ref
TB-J-TPS1 Throttle position 1
OEM-A-18 Vehicle speed sensor
OEM-B-11 VTEC oil pressure switch
OEM-A-7 Crank position sensor (T1)
OEM-E-20 Secondary O2 sensor
OEM-E-25 Engine speed pulse (tacho)
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-6 VTEC solenoid
Relay coil positive (switched +12 V)
MICROSQUIRT-A-17 WLED
TB
TB-J
TB
GNDThrottle sensor ground
TPS1Throttle position 1
VCCThrottle sensor 5V supply
0V sensor
MICROSQUIRT-A-29 SPAREADC
Throttle sensor 5V supply
SP-14V · 6 pins
SP-GND · 8 pins
SP-0V · 8 pins
SP-5V1 · 6 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.
50 / 50 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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