SM4 Manual
by
MRM-Racing
V3.0
11
4. Inputs:
a. Connect the throttle position sensor (TPS) See Manual
Throttle Position Sensor
for detailed wiring.
b. Connect the Autronic Air Temperature Sensor, other sensor may be used see
software setup A
nalog inputs.
c. Connect the Coolant Sensor, other type may be used see software setup A
nalog
inputs.
d. Run a good quality hose to the internal MAP sensor on the ECU (if used), Make
sure the hose not will come off under pressure (on turbocharged engines). Secure
the hose with cable clamps or nylon ties. Select a vacuum connection that has no
other accessories which will share the vacuum like boost valves, dump valves. If
there is no empty connector it can share with fuel regulator or boost gauge. Make
sure the point of connection will not cause fuel to get into the hose and run down
into the map sensor.
e. Connect O2 sensor if needed,
f. Connect the crank angle sensor; The crank sensor can be a hall sensor type or a
inductive type. See in this manual "crank and cam sensor set up" for detailed
wiring and setup. Make sure only shielded wires are used if using inductive
sensor. The crank sensor signal can come from a distributor or the camshaft, and
still give crank position.
g. Connect the cam sync sensor; The cam sync sensor can be a hall sensor type or
a inductive type. See in this manual "crank and cam sensor set up" for detailed
wiring and setup. Make sure only shielded wires are used if using inductive
sensor. If using distributor, a
No1 spark plug pickup
can be used instead of the
cam sensor to give the synchronisation pulse to the ECU.
h. Connect vehicle speed sensor and other inputs if used, like anti-lag, input and
more.
5.
Outputs:
When running the wiring for outputs, run any power and ground wiring to the locations
where they will be connected, but do not connect power or ground the connections yet.
a. Run the injector wires to the fuel injectors; Remember to wire them in ignition
order, injector 1 to cylinder 1, injector 2 to next cylinder in firing order. See wiring
diagram fore more information.
b. Connect your fuel pump to the big brown fuel pump wire.
c. Run the loom from all ignition outputs to the ignition module/modules or CDI. The
ignition modules are often called ignition amplifiers. They can be of a dumb type
which uses dwell control from SM4 or smart types which use a pulse output, like
the CDI. The output sequence is different from SMC/SM2 when used on multi coil
setup. The SM4 always start with output number 1 and then output 2. Always wire
them in firing order. See wiring diagram fore more information.
