G4 Wiring and Installation Manual48
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9.3 Metering Oil Pump Wiring
Rotary engines Metering Oil Pumps can be controled directly from G4 ECU's. This involves
wiring the pumps stepper motor and position feedback to the ECU.
Metering Oil Pump Control Wiring
Notes for wiring the stepper motor:
· The centre tap of both windings should be wired to the same power supply as the
ECU to ensure correct flywheeling and to prevent backfeeding.
· One common pair of windings must be wired to Auxiliary Outputs 5 and 6. The other
pair must be wired to Auxiliary Ouputs 7 and 8.
· Auxiliary Outputs 5-8 must be set to “Rotary Oil Pump”.
· Use the Stepper Calibration function (found under Aux 8) to test if the stepper is wired
correctly. Setting Stepper Calibration to Fully Closed should cause the motor to close
the valve (so no oil enters the engine). Likewise, setting Stepper Calibration to Fully
Open should cause the motor to completely open the valve. Once finished tested, set
Stepper Calibration to Off.
· If the motor rotates in the wrong direction swap the wiring of Aux 7 and Aux 8.
Notes for wiring the motor position feedback:
· Any Analog Volt input can be used for the feedback position signal.
· The sensor should be wired to the ECU's sensor ground (which is grounded at the
ECU) not directly to the engine.
· When wired correctly the position signal should have approximately 0.9V with the
valve fully closed and 4.4V with the valve fully open (note that if this is opposite it can
be compensated for using the analog inputs calibration).
Instructions for configuring and calibrating the ECU for Metering Oil Pump Control can be
found in the PCLink Tuning Software online help (search Metering Oil Pump). These must
be followed exactly to ensure accurate oil metering. This MUST be done before attempting
to start the engine.
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