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Revision as of 03:54, 17 April 2026

General Setup

Crank sensor

07k crank sensor with plug

The 07K engine uses a Hall Effect crank position sensor. This is synced with the cam sensor for Dual Wheel Missing Tooth engine operation and VVT.

Crank sensor pinout

On the rear of the sensor plug the wires are numbered 1 through 3.

Pin 1: 5v.

Pin 2: Sensor output.

Pin 3: Sensor ground.

For best results this sensor should shielded and kept away from sources of EMI like the starter, high-current wires, and any noise source.

For Mega Squirt, a pull up resistor is needed for the ecu to recognize the signal. This is done by wiring a resistor between 5v and sensor output.

Incorrect wiring diagrams

07k vs 1.8t crank sensor comparison

This sensor is easily confused with the similar-looking 1.8t Variable-Reluctance(VR). Both are three-wire sensors, The 07k uses two small hex bolts and the 1.8t uses a single bolt. In the wiring diagrams of both the 1.8t and the B series of engines (BGP, BGQ, BPS) have the same sensor diagram but use different sensors. Per the diagram, both show the 3-wire VR sensor with VR+, VR-, and shield ground, this is incorrect for the 07k. The C series of engines (CBTA, etc.) does not display a diagram for the sensor.

Cam Sensor

07k Cam sensor

The 07k uses a single Hall effect sensor on the intake cam. This is synced with the crank sensor for Dual Wheel Missing Tooth engine operation and VVT.

Cam sensor pinout

On the rear of the sensor plug the wires are numbered 1 through 3.

Pin 1: 5v.

Pin 2: Sensor output.

Pin 3: Sensor ground.

For best results this sensor should shielded and kept away from sources of EMI like the starter, high-current wires, and any noise source.

Coil On Plug(COP)

Coolant sensor

2 Wire

3 Wire

Knock Sensor(s)

Throttle body

The 07k uses a drive by wire throttle body, in order to control the thorttle body, you need a 3rd party throttle controller called DBW controller. Preferably wire the controler via can bus to the ecu to avoid extra wiring. A DBW control can be made by Arduino or purchased like the ldperformance DBW or DBWX2.

Map sensor

VVT

Accelerator Pedal

I have only messed with mk5 and mk7 pedals and they had identical pin layouts as follows.

Accelerator Pedal Pinout

Pin 1: +5

Pin 2: +5

Pin 3: ground

Pin 4: Output 1

Pin 5: ground

Pin 6: Output 2

If you want to bypass the safety of having multiple 5v inputs, wire both the 5v together, this can also be done with the grounds.

Mega squirt 3X

**Please note that this is a work in progress, tune and wire at your own risk**

Ignition options / Wheel Decoder

TunerStudio ignition/wheel decoder options page for a cam and crank sensor setup.

Coil on plug(COP)

Wiring diagram for COP^[1]

VW/Audi COP issue

The MegaSquirt3X cannot drive the VW/Audi coils directly. This is due to the SNx4AHCT541 Integrated circuit is limited by the resistance of the trigger of the coil being lower than 1k ohm. The resistance of the standard COPs is ~440 ohm. This causes the coils to pull more current than SNx4AHCT541 can handle and leads to misfires and potential EMI issues in the MS3X leading to RPM sync loss.

VW/Audi COP fix

The fix to this issue is using three TC4427 Integrated circuits that can handle the required higher current (the number of ICs can be scaled for more cylinders) and one 15 ohm resistor on the output of each TC4427.

MS3X ignition output modification circuit^[2]

Megasquirt VAG COP driver on a PCB^[3]

Drive by cable

Using a VR6 Throttle body

Wiring diagram

Male 8 pin plug going into to throttle body

MS3X 2 wire PWM idle circuit ^[4]

Helpful links

@@ Line 13: / Line 13: @@
 '''Pin 3: Sensor ground.'''
-[[File:07k vs 1.8 crank sens.png|thumb|07k vs 1.8t crank sensor comparison ]]
 For best results this sensor should shielded and kept away from sources of EMI like the starter, high-current wires, and any noise source.
 For Mega Squirt, a pull up resistor is needed for the ecu to recognize the signal. This is done by wiring a resistor between 5v and sensor output.
 ===== Incorrect wiring diagrams =====
+[[File:07k vs 1.8 crank sens.png|thumb|07k vs 1.8t crank sensor comparison ]]
 This sensor is easily confused with the similar-looking 1.8t Variable-Reluctance(VR). Both are three-wire sensors, The 07k uses two small hex bolts and the 1.8t uses a single bolt. In the [[Wiring Diagrams|wiring diagrams]] of both the 1.8t and the B series of engines (BGP, BGQ, BPS) have the same sensor diagram but use different sensors. Per the diagram, both show the 3-wire VR sensor with VR+, VR-, and shield ground, this is incorrect for the 07k. The C series of engines (CBTA, etc.) does not display a diagram for the sensor.
 === Cam Sensor ===
+[[File:07k Cam sensor.jpg|thumb|07k Cam sensor]]
 The 07k uses a single Hall effect sensor on the intake cam. This is synced with the crank sensor for Dual Wheel Missing Tooth engine operation and VVT.
 ==== Cam sensor pinout ====
-[[File:07k Cam sensor.jpg|thumb|07k Cam sensor]]
 On the rear of the sensor plug the wires are numbered 1 through 3.
@@ Line 77: / Line 84: @@
 === Ignition options / Wheel Decoder ===
 [[File:MS3x Tunerstudio ignition - wheel decoder options page.jpg|left|thumb|TunerStudio ignition/wheel decoder options page for a cam and crank sensor setup.]]
@@ Line 93: / Line 103: @@
 === Coil on plug(COP) ===
 [[File:COP wiring diagram.png|thumb|Wiring diagram for COP<ref>http://www.extraefi.co.uk/</ref>|left]]
@@ Line 109: / Line 118: @@
 ==== VW/Audi COP fix ====
-The fix to this issue is using three TC4427 Integrated circuits that can handle the required higher current (the number of ICs can be scaled for more cylinders) and one 15 ohm resistor on the output of each TC4427.  [[File:Tc4427 wiring.jpg|thumb|MS3X ignition output modification circuit<ref>https://www.msextra.com/forums/viewtopic.php?t=75997</ref>|left]]
+The fix to this issue is using three TC4427 Integrated circuits that can handle the required higher current (the number of ICs can be scaled for more cylinders) and one 15 ohm resistor on the output of each TC4427.  [[File:Tc4427 wiring.jpg|thumb|MS3X ignition output modification circuit<ref>https://www.msextra.com/forums/viewtopic.php?t=75997</ref>|left]][[File:Megasquirt VAG COP driver.png|thumb|Megasquirt VAG COP driver on a PCB<ref>https://shop.fullest.fi/product/6894/vag-cop-driver-8-channel-without-casing</ref>|center]]
-[[File:Megasquirt VAG COP driver.png|thumb|Megasquirt VAG COP driver on a PCB<ref>https://shop.fullest.fi/product/6894/vag-cop-driver-8-channel-without-casing</ref>|left]]
@@ Line 138: / Line 134: @@
 [[File:2 wire pwm MS3X circuit .png|thumb|MS3X 2 wire PWM idle circuit <ref>https://www.msextra.com/manuals/ms3manuals/</ref>|left]]