Exhaust Gas Sensor (optional)
The Optional exhaust gas oxygen sensor must be mounted in the exhaust pipe near the
exhaust header or extractors, usually after the collector. The sensor uses exhaust gas to detect
if the engine is lean or rich. Many late model engines already have provision for an exhaust gas
oxygen sensor and the sensor provided should fit any standard exhaust mount. If the exhaust
system does not have an existing sensor mount then a new mount will have to be welded to the
exhaust system. When routing the electrical system and connectors to the exhaust gas oxygen
sensor do not allow the harness to touch the exhaust pipe, as heat will damage them.
Best oxygen sensor is the 4-wire type. Normally the two white are heating (power and ground)
and the black is signal and grey sensor ground. You can also weld an extra mount for tuning
with an Autronic analyser. The sensors signal should be wired to any Analog input on the SM4,
and be configured under A/F Ratio menu I/P Analogs.
Crank and Cylinder Reference Wiring
The SM4 is capable of being triggered by magnetic (uses internal reluctor) and digital trigger
like Hall Effect and optical. The Hall Effect or Optical trigger requires power (5-12 Volts), signal
and ground. If using magnetic triggers you must use shielded wires, se wiring diagram at the
end of this manual for wiring, the software is set under menu I/P Crank & Cyl.
Autronic Hall effect trigger, the wire with colour strip is the power lead.
Gap between sensor and teeth should be 1 mm ( .049”)
Warning:
Igniters such as Bosch 124, 200, 211, 230 which do not provide dwell (Most standard igniters
are dumb) you must select -ve edge (Dwell) in Ignition Setup menu M1. Also check you
Ignition Dwell Table for proper coil charge time. Coils on top normally will have less charge
time than stand alone coils.
Consult your dealer for proper values.
Do not connect the modules to the loom until you have configured the ECU by connecting to
a computer with Autronic software.
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