Pinout

MaxxECU PRO pinout

Every pin of the 48-pin C1, 32-pin C2, 48-pin C3, and 32-pin C4 connectors, with the wire colours of MaxxECU's harness. Tap a pin to see what it does.

Every pin checked against 2 MaxxECU documents
Connector C1 · 48-pinLooking into the plug's mating face, cavity letters as Molex (the plug's maker) prints them
A1A2A3A4B1B2B3B4C1C2C3C4D1D2D3D4E1E2E3E4F1F2F3F4G1G2G3G4H1H2H3H4J1J2J3J4K1K2K3K4L1L2L3L4M1M2M3M4
Connector C2 · 32-pinLooking into the plug's mating face, cavity letters as Molex (the plug's maker) prints them
A1A2A3A4B1B2B3B4C1C2C3C4D1D2D3D4E1E2E3E4F1F2F3F4G1G2G3G4H1H2H3H4
Connector C3 · 48-pinLooking into the plug's mating face, cavity letters as Molex (the plug's maker) prints them
A1A2A3A4B1B2B3B4C1C2C3C4D1D2D3D4E1E2E3E4F1F2F3F4G1G2G3G4H1H2H3H4J1J2J3J4K1K2K3K4L1L2L3L4M1M2M3M4
Connector C4 · 32-pinLooking into the plug's mating face, cavity letters as Molex (the plug's maker) prints them
A1A2A3A4B1B2B3B4C1C2C3C4D1D2D3D4E1E2E3E4F1F2F3F4G1G2G3G4H1H2H3H4

Pick any pin on the drawing or in the table to see its function, its wire colour and the documents it was checked in.

MaxxECU PRO connector C1 pinout (48-pin)

Mating connector: Molex 643203311

PinFunctionWireMaxxECU note
C1-A1GP OUT 5green
C1-A2IGNITION CYL 1blue
C1-A3IGNITION CYL 2blue
C1-A4TACH/GP OUT 8green660ohm pullup
C1-B1GP OUT 6green
C1-B2IGNITION CYL 3blue
C1-B3IGNITION CYL 4blue
C1-B4GP OUT 1green
C1-C1GP OUT 7green
C1-C2IGNITION CYL 5blue
C1-C3IGNITION CYL 6blue
C1-C4GP OUT 2green
C1-D1WBO2 HTR PIN4-
C1-D2IGNITION CYL 7blue
C1-D3IGNITION CYL 8blue
C1-D4GP OUT 3green
C1-E1CAN Hgrey
C1-E2CAN Lpink
C1-E3SHIELD GNDblack/white
C1-E4GP OUT 4green
C1-F1COOLANT SENSORblack
C1-F2AIR TEMP SENSORblack
C1-F3WBO2 COMyellow
C1-F4WBO2 VS/02 INbrown
C1-G15V SENSOR SUPPLYred(peak 0.5A, max 150mA)
C1-G2THROTTLE SENSORblack
C1-G3WBO2 IPwhite
C1-G4WBO2 RCALgreen
C1-H1SENSOR GNDbrown
C1-H2VR GNDbrown
C1-H3TRIGGERwhite
C1-H4HOME/CAMwhite
C1-J1ANALOG IN 1, TEMPblack
C1-J2ANALOG IN 2, TEMPblack
C1-J3ANALOG IN 3, 0-5Vblack
C1-J4ANALOG IN 4, 0-5Vblack
C1-K1INJECTOR CYL 1grey
C1-K2INJECTOR CYL 2grey
C1-K3DIGITAL IN 1black
C1-K4DIGITAL IN 2black
C1-L1INJECTOR CYL 8grey
C1-L2INJECTOR CYL 7grey
C1-L3INJECTOR CYL 6grey
C1-L4ENGINE GROUND-
C1-M1INJECTOR CYL 3grey
C1-M2INJECTOR CYL 4grey
C1-M3INJECTOR CYL 5grey
C1-M412V ECUred

MaxxECU PRO connector C2 pinout (32-pin)

Mating connector: Molex 0643191218

PinFunctionWireMaxxECU note
C2-A1EGT1+-
C2-A2EGT2+-
C2-A3EGT3+-
C2-A4EGT4+-
C2-B1EGT1--
C2-B2EGT2--
C2-B3EGT3--
C2-B4EGT4--
C2-C1EGT5+-
C2-C2EGT6+-
C2-C3EGT7+-
C2-C4EGT8+-
C2-D1EGT5--
C2-D2EGT6--
C2-D3EGT7--
C2-D4EGT8--
C2-E1EGT9+-
C2-E2EGT10+-
C2-E3EGT11+-
C2-E4EGT12+-
C2-F1EGT9--
C2-F2EGT10--
C2-F3EGT11--
C2-F4EGT12--
C2-G1Not used-
C2-G2Not used-
C2-G3Not used-
C2-G4Not used-
C2-H1ENGINE GROUND 3-
C2-H2ENGINE GROUND 3-
C2-H3ENGINE GROUND 3-
C2-H4Not used-

MaxxECU PRO connector C3 pinout (48-pin)

Mating connector: Molex 0643203319

PinFunctionWireMaxxECU note
C3-A1DIGITAL/VR IN 4black
C3-A2DIGITAL/VR IN 5black
C3-A3DIGITAL IN 6black
C3-A4DIGITAL IN 7black
C3-B1WBO2 2 RCALgreen
C3-B2WBO2 2 IPwhite
C3-B3WBO2 2 VS/02 INbrown
C3-B4WBO2 2 COMyellow
C3-C1SHIELD GNDblack/white
C3-C25V SENSOR SUPPLY 2red(peak 0.5A, max 150mA)
C3-C3ANALOG IN 5 (0-5V)black
C3-C4GP OUT 19 (12V)red
C3-D1ANALOG IN 6 (0-5V)black
C3-D2ANALOG IN 7 (0-5V)black
C3-D3ANALOG IN 8 (0-5V)black
C3-D4GP OUT 20 (12V)red
C3-E1GP OUT 10 /WBO2 2 HTRgreen
C3-E2ANALOG IN 9 (0-5V)black
C3-E3ANALOG IN 10 (0-5V)black
C3-E4GP OUT 21 (12V)red
C3-F1INJECTOR CYL 15grey
C3-F2ANALOG IN 11 (0-5V)black
C3-F3ANALOG IN 12 (0-5V)black
C3-F4GP OUT 22 (12V)red
C3-G1INJECTOR CYL 14grey
C3-G2IGNITION CYL 11blue
C3-G3IGNITION CYL 9blue
C3-G4GP OUT 15 (12V)red
C3-H1INJECTOR CYL 13grey
C3-H2IGNITION CYL 12blue
C3-H3IGNITION CYL 10blue
C3-H4GP OUT 16 (12V)red
C3-J1INJECTOR CYL 16grey
C3-J2SENSOR GND 2brown
C3-J3SENSOR GND 2brown
C3-J4GP OUT 17 (12V)red
C3-K1INJECTOR CYL 10grey
C3-K2INJECTOR CYL 9grey
C3-K3KEY IN 12Vblack
C3-K4GP OUT 18 (12V)red
C3-L1INJECTOR CYL 11grey
C3-L2GP OUT 12/MOTOR 1 +red
C3-L3GP OUT 11/MOTOR 1 -red
C3-L4ENGINE GROUND 2-
C3-M1INJECTOR CYL 12grey
C3-M2GP OUT 13/MOTOR 2 +red
C3-M3GP OUT 14/MOTOR 2 -red
C3-M412V ECU 2red

MaxxECU PRO connector C4 pinout (32-pin)

Mating connector: Molex 0643193211

PinFunctionWireMaxxECU note
C4-A1CAN 2 Hgrey
C4-A2CAN 2 Lpink
C4-A30-5V OUT 1blue
C4-A40-5V OUT 2blue
C4-B1ANALOG IN 18 (0-5V)black
C4-B2ANALOG IN 17 (0-5V)black
C4-B3ANALOG IN 16 (0-5V)black
C4-B4ANALOG IN 15 (0-5V)black
C4-C1ANALOG IN 14 (0-5V)black
C4-C2ANALOG IN 13 (0-5V)black
C4-C3ANALOG IN 19 (TEMP)black
C4-C4ANALOG IN 20 (TEMP)black
C4-D1ANALOG IN 21 (TEMP)black
C4-D2ANALOG IN 22 (TEMP)black
C4-D3USER DIN 8 SWITCHblack
C4-D4USER DIN 9 SWITCHblack
C4-E1USER DIN 10 SWITCHblack
C4-E2USER DIN 11 SWITCHblack
C4-E35V SENSOR SUPPLY 3red(peak 0.5A, max 150mA)
C4-E45-10V SENSOR SUPPLY-
C4-F1GPO 23-30 FLYBACKgreen
C4-F2KNOCK 1whiteOnly available on REV10+ units
C4-F3KNOCK 2whiteREV10+ units = KNOCK 2, earlier rev = Sensor GND 3
C4-F4SENSOR GND 3/KNOCK GNDbrownREV10+ units = KNOCK GND, earlier rev = Sensor GND 3
C4-G1GP OUT 23green
C4-G2GP OUT 24green
C4-G3GP OUT 25green
C4-G4GP OUT 26green
C4-H1GP OUT 27green
C4-H2GP OUT 28green
C4-H3GP OUT 29green
C4-H4GP OUT 30green

MaxxECU PRO pins at a glance

Which pins are CAN on the MaxxECU PRO?
CAN H: pin C1-E1 (grey). CAN L: pin C1-E2 (pink). CAN 2 H: pin C4-A1 (grey). CAN 2 L: pin C4-A2 (pink).
Which pins are the crank and cam inputs on the MaxxECU PRO?
VR GND: pin C1-H2 (brown). TRIGGER: pin C1-H3 (white). HOME/CAM: pin C1-H4 (white).
Which pins are the injector outputs on the MaxxECU PRO?
INJECTOR CYL 1: pin C1-K1 (grey). INJECTOR CYL 2: pin C1-K2 (grey). INJECTOR CYL 8: pin C1-L1 (grey). INJECTOR CYL 7: pin C1-L2 (grey). INJECTOR CYL 6: pin C1-L3 (grey). INJECTOR CYL 3: pin C1-M1 (grey). INJECTOR CYL 4: pin C1-M2 (grey). INJECTOR CYL 5: pin C1-M3 (grey). INJECTOR CYL 15: pin C3-F1 (grey). INJECTOR CYL 14: pin C3-G1 (grey). INJECTOR CYL 13: pin C3-H1 (grey). INJECTOR CYL 16: pin C3-J1 (grey). INJECTOR CYL 10: pin C3-K1 (grey). INJECTOR CYL 9: pin C3-K2 (grey). INJECTOR CYL 11: pin C3-L1 (grey). INJECTOR CYL 12: pin C3-M1 (grey).
Which pins are the ignition outputs on the MaxxECU PRO?
IGNITION CYL 1: pin C1-A2 (blue). IGNITION CYL 2: pin C1-A3 (blue). IGNITION CYL 3: pin C1-B2 (blue). IGNITION CYL 4: pin C1-B3 (blue). IGNITION CYL 5: pin C1-C2 (blue). IGNITION CYL 6: pin C1-C3 (blue). IGNITION CYL 7: pin C1-D2 (blue). IGNITION CYL 8: pin C1-D3 (blue). IGNITION CYL 11: pin C3-G2 (blue). IGNITION CYL 9: pin C3-G3 (blue). IGNITION CYL 12: pin C3-H2 (blue). IGNITION CYL 10: pin C3-H3 (blue).
Which pins are ground on the MaxxECU PRO?
SENSOR GND: pin C1-H1 (brown). ENGINE GROUND: pin C1-L4. ENGINE GROUND 3: pins C2-H1, C2-H2, C2-H3. SENSOR GND 2: pins C3-J2, C3-J3 (brown). ENGINE GROUND 2: pin C3-L4. SENSOR GND 3/KNOCK GND: pin C4-F4 (brown).
Which pins power the MaxxECU PRO?
12V ECU: pin C1-M4 (red). KEY IN 12V: pin C3-K3 (black). 12V ECU 2: pin C3-M4 (red).
Which pins are the sensor supplies on the MaxxECU PRO?
5V SENSOR SUPPLY: pin C1-G1 (red). 5V SENSOR SUPPLY 2: pin C3-C2 (red). 5V SENSOR SUPPLY 3: pin C4-E3 (red).
Which pins are the wideband sensor connections on the MaxxECU PRO?
WBO2 HTR PIN4: pin C1-D1. WBO2 COM: pin C1-F3 (yellow). WBO2 VS/02 IN: pin C1-F4 (brown). WBO2 IP: pin C1-G3 (white). WBO2 RCAL: pin C1-G4 (green). WBO2 2 RCAL: pin C3-B1 (green). WBO2 2 IP: pin C3-B2 (white). WBO2 2 VS/02 IN: pin C3-B3 (brown). WBO2 2 COM: pin C3-B4 (yellow).

MaxxECU PRO pinout sheet

A printable sheet with the connector drawings and every pin, made from the checked data on this page.

Download PDFDownload diagram (PNG)
MaxxECU PRO pinout diagram with wire colours

Where this comes from

Only MaxxECU's own documents. Pin names and notes are written exactly as MaxxECU writes them.

How we checked it

  • We start from MaxxECU's pinout table for this ECU.
  • We read every pin again from a second MaxxECU document, the wiring diagram or the quick start guide. A script compares the two, pin by pin.
  • A pin is only shown when its function and its wire colour match in both. Where a diagram has no text to read, we read the pins off the drawing itself.
  • The notes are MaxxECU's own words from its pinout table.

Where MaxxECU's documents disagree

C2-H1: MaxxECU's online pinout and its PRO REV9+ wiring diagram call these pins ENGINE GROUND 3; the PRO REV10+ diagram calls them ENGINE GROUND 2. They are engine grounds in every document; we show the name two documents agree on.

C2-H2: MaxxECU's online pinout and its PRO REV9+ wiring diagram call this pin ENGINE GROUND 3; the PRO REV10+ diagram calls it ENGINE GROUND 2. It is an engine ground in every document; we show the name two documents agree on.

C2-H3: MaxxECU's online pinout and its PRO REV9+ wiring diagram call this pin ENGINE GROUND 3; the PRO REV10+ diagram calls it ENGINE GROUND 2. It is an engine ground in every document; we show the name two documents agree on.

C3-L4: MaxxECU's online pinout and its PRO REV9+ wiring diagram call this pin ENGINE GROUND 2; the PRO REV10+ diagram calls it ENGINE GROUND 3. It is an engine ground in every document; we show the name two documents agree on.

ECU Recovery is not affiliated with MaxxECU. MaxxECU and its product names are trademarks of MaxxECU. If your harness came with its own diagram, check your wiring against it.

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