Note on Intermittents

If an intermittent Code 20 is being set, manipulate the related wiring while observing engine data parameter .1.0 with the engine running and the oil pressure switch disconnected. The oil pressure switch should be disconnected since this redundant fuel pump feed can cover-up some circuit malfunctions. If the failure is induced, the "battery voltage" reading will drop from its normal reading to a reading of 0 volts (the engine may also stall). This will help to isolate the location of the malfunction.