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
MICROSQUIRT-A-30 OPTO+
11 no data
14 no data
MICROSQUIRT-A-8 FP (pump)
MICROSQUIRT-A-17 WLED
MICROSQUIRT-A-7 FIDLE
MICROSQUIRT-A-35 TACHO
22 no data
MICROSQUIRT-A-34 O2
MICROSQUIRT-A-6 FLEX
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
22 no data
23Secondary O2 sensor
24Starter switch signal
31 no data
Power source 1 (main relay)
GND
MICROSQUIRT-A-10 INJ 2
MICROSQUIRT-A-9 INJ 1
MICROSQUIRT-A-10 INJ 2
6–8 no data
Power source 2 (main relay)
GND
MICROSQUIRT-A-9 INJ 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
MICROSQUIRT-A-11 SPK B (IGN2)
MICROSQUIRT-A-31 OPTO-
6 no data
0V sensor
MICROSQUIRT-A-32 VR1+
SP-0V · 3 pins
MICROSQUIRT-A-12 SPK A (IGN 1)
MICROSQUIRT-A-5 SPAREADC2 (MAF)
MICROSQUIRT-A-29 SPAREADC
MICROSQUIRT-A-24 MAP
0V sensor
5V ref
MICROSQUIRT-A-4 VR2+
SP-0V · 3 pins
23 no data
MICROSQUIRT-A-26 MAT
MICROSQUIRT-A-25 CLT
MICROSQUIRT-A-27 TPS
5V ref
MICROSQUIRT-A-21 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
15Secondary O2 sensor
16Primary O2 sensor
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
MICROSQUIRT
MICROSQUIRT-A
MICROSQUIRT
1+12V In
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
21VR2-
22POWER GROUND
23POWER GROUND
24MAP
25CLT
26MAT
27TPS
28TPS VREF (5V)
29SPAREADC
30OPTO+
31OPTO-
32VR1+
34O2
35TACHO
+12V In
OEM-C-20 Cam (TDC1) sensor +
OEM-C-15 Secondary O2 sensor
OEM-A-24 Starter switch signal
OEM-A-17 A/C clutch relay
OEM-A-15 Fuel pump relay (USDM)
Injector 3 · 2 pins
INJ 2 · 2 pins
OEM-C-4 Ignition coil 1
OEM-C-12 Ignition coil 2
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-A-16 Fuel pump relay (JDM)
0V sensor
0V sensor
0V sensor
OEM-C-29 Cam (TDC2) sensor +
GND
GND
OEM-C-17 MAP sensor
OEM-C-26 Coolant temp sensor
OEM-C-25 Intake air temp sensor
OEM-C-27 Throttle position sensor
5V ref
OEM-C-16 Primary O2 sensor
OEM-A-9 Vehicle speed sensor
OEM-C-5 Alternator FR signal
OEM-C-8 Crank sensor + (CKP+)
OEM-A-23 Secondary O2 sensor
OEM-A-19 Tacho output
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)
MICROSQUIRT-A-16 ALED
SP-GND · 7 pins
SP-14V · 6 pins
SP-0V · 10 pins
SP-5V1 · 4 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.
48 / 48 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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