3 | Technical Data
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Engine_Control_Unit_MS_3_Sport_GT3_Cup_Manual
Bosch Motorsport
85
30
87a
87
86
Bosch Automotive relay
Fuse / Circuit breaker
KL30
KL15
To battery plus (+)
Master kill switch
Ignition switch
Notes:
-
ECU requires a dedicated relay to be installed in the car
-
KL30 is HAAT (Hot At All Times)
-
KL15 is hot only when ECU engages relay
-
ECU will engage relay after 12V is detected on pin ‘J’ by pulling pin ‘B’ to ground
-
ECU will disengage the relay after 12V is removed from pin ‘J’,
but may be delayed for up to 2 seconds after engine speed signal is zero.
-
It is recommended to fuse the KL30 circuit
-
Wire gauge recommendations based on Raychem Spec 44 wire
KL30
KL15
KL15 IN
Main relay
KL31
KL31
To battery minus (-)
14ga
20ga
20ga
14ga
20ga
20ga
20ga
16ga
16ga
16ga
16ga
14ga
14ga
F
H
B
C
G
L
M
J
Spec
harness
connector
ECU
Illustration 4: Power supply connection plan
CAUTION
Wrong polarity / high currents
Wrong polarity of the terminals and high currents damage the MS 3 Sport GT3 Cup. Be
careful to observe current limits of wires and connector pins!
3.4 Ignition trigger wheel
To start the engine, the ECU requires information about the position of the camshaft and
crankshaft. These are determined by using sensors on the cam and crankshaft generator
gear.
In this chapter you’ll find the sensors you need to detect the camshaft and crankshaft pos-
ition and how to tune the components to each other.
3.4.1 Camshaft and Crankshaft Sensors
Camshaft trigger sensor
The camshaft trigger sensor is a Hall-effect type with a single tooth trigger wheel. Bosch
Motorsport recommends the use of Hall-effect sensor HA-P.
Illustration 5: Camshaft wheel
