85 engine electrical.pdf - Vintage Snow

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ENGINE ELECTRICALEFI ElectronicsFuel InjectorsVariation in the amount of fuel delivered per stroke tosuit varying load and speed conditions can beobtained by controlling the discharge duration of theinjector.The injector is a solenoid-actuated constant strokeplunger consisting of a solenoid, plunger, needlevalve and housing. The ECU will determine theduration time the injector is energized to deliver fuel.The resistance between the two pins on the injector(isolated) should be 2 to 2.5 ohms. There should beno continuity to ground. CAUTION: Since theoperating voltage is approximately 5 volts DC on theinjectors, never attempt to test them with any highervoltage or the injector will be destroyed.Select Monitor ReadingsModeFBO-21FBO-22FBO-23DescriptionType One System RXLType Two System 500 EFIType One SystemType Two SystemType One SystemNormal ReadingMag Side InjectorCenter of PTO Injector on Twin CylindersPTO InjectorDropping ResistorThe dropping resistor is mounted on the engine side ofthe battery box. The three cylinder system consists offour individual resistors (only three are used) wired inparallel with a common voltage feed. The twincylinder has two resistors wired parallel, also with acommon voltage feed. They are used to drop orreduce the voltage going to the injectors toapproximately 5 volts. Voltage from the batterytravels through one of the resistors, through aninjector and into the ECU. A failure of any injector orresistor will cause one cylinder to quit operating. TheECU will then flash the trouble code for that injector.NOTE: The ECU can only determine electrical failure.If an injector failure code is flashing, the problem couldbe anywhere in the electrical circuit for that injector.The ECU will not find a plugged or leaky injector.The dropping resistor may be tested with an ohmmeter between the white terminal and each of the black terminalsat the resistor plug. The resistance is 6 ohms ± 10%. Replace the resistor if any of the readings are outside of thespec. Clean the terminals if they become corroded. NOTE: The injector's operating power comes through theseresistors. Any suspected injector electrical problem must first be traced through the dropping resistor.8/94 4.60
!£WitECU DiagnosticsENGINE ELECTRICALEFI ElectronicsIf any of the main sensors should malfunction while the machine is being driven, the ECU will sense a problem andproceed to an over-rich "fail-safe" mode. An open or shorted circuit in any of the sensor circuits will show the ECUa reading outside of what it normally sees and the ECU will determine that a problem exists. Without this feature,certain kinds of failures could cause the mixture to be leaner than the required ratio and cause engine damage.This feature is important for engine protection. Once the sensor problem is determined and corrected, the ECUwill return to the original map.If any of the injectors or sensors should malfunction during operation, the ECU will record this information and startflashing a Light Emitting Diode (LED) code informing the mechanic/owner which component failed. The LED is onthe right of the ECU, in front of the main plug. See ECU photo. If the problem still exists and is ongoing, the LEDwill continuously flash the code. If the problem occurred but the machine is now operating properly (intermittent), itwill be stored in the memory and can be drawn out of the ECU by connecting the gray and black wires together atthe diagnostic plug. The LED will then begin blinking long followed by short light pulses; then a pause and the longand short pulses again. The long pulses are the first digit in the code and the short pulses are the second digit.Compare the code to the following trouble code chart to determine the problem. Remember that the problem canexist in the sensor, the power feed to the sensor, the sensor ground, connectors, or the part of the injector orsensor circuit inside the ECU.Select Monitor ReadingsMode FBa is for existing problem diagnosis. Pressbuttons F, B, a and enter. If there is an existingproblem, a code number and the abbreviation of theproblem component will appear. See the chart for anexplanation of the code numbers. The LED will alsodisplay this code. Example: Code 12- the light willdisplay one long and two short pulses.Mode FB 1 is for retrieving trouble codes from the ECUmemory. If a problem happened sometime during themachine's operation, but everything is operatingproperly at the present time, the ECU memory willverify which component was at fault. This is good forfinding intermittent problems such as a wiring open orshort. Press the F, B, 1 and enter buttons. If thedisplay shows one of the above codes, check thatcomponent and its circuit. If nothing appears, there isnothing in memory. NOTE: If the ECU power isdisconnected at any time, this memory will be erased.Mode FCa is used for erasing problem codes whichare stored in the ECU's memory. To erase theproblem codes, certain steps must be followed inorder. First select the mode for the component whichindicated a failu re. Next, press F, C, a and enter on themonitor. The display will ask "Memory clear? a-yesand 1-no". By pressing a and enter the memory will beerased. Indication of the memory being cleared will bea display of "Please key off'.Monitorand LEDCode111213141415212223313233SystemType Type Abb. ComponentOne TwoX X THV Throttle PositionSensorX X TCaseCrankcaseTemperature SensorX X T Air Intake AirTemperature SensorX ALT Barometric PressureSensorX TW Water TemperatureSensorX ALT Barometric PressureSensorX X Inj 1 Mag Side InjectorX X Inj 2 Center Injector orPTa on TwinsX Inj 3 PTa InjectorX VB Low Battery VoltageX VB Low ChargingSystem OutputX COl COl OutputoMode DescriptionNormal ReadingFBD Existing Trouble Faults Presently ExistingCodesFB1 Memory Trouble Faults Which AreCodesIntermittentFCD Memory Clear Used to Remove StoredInformation4.618/94
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CHAPTER 4ENGINE ELECTRICAL "Ignitio
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Electronic Control SystemSystem III
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1985 ModelsENGINE ELECTRICALIgnitio
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ENGINE ELECTRICALIgnition Data1988
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Page 16 and 17: ENGINE ELECTRICALTypical 1985 - Cur
Page 18 and 19: ENGINE ELECTRICALSingle Cylinder CO
Page 20 and 21: ENGINE ELECTRICALTwin Cylinder Fan
Page 22 and 23: ENGINE ELECTRICALThree Cylinder COl
Page 24 and 25: ENGINE ELECTRICALOperating RPM Timi
Page 26 and 27: ENGINE ELECTRICALIgnition I Chargin
Page 28 and 29: ENGINE ELECTRICALIgnition I Chargin
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Page 32 and 33: ENGINE ELECTRICALTypical Exciter, P
Page 34 and 35: ENGINE ELECTRICALBattery ServiceLoa
Page 36 and 37: ENGINE ELECTRICALElectric Starter S
Page 39: Electrical Fuel InjectionSection 44
Page 42 and 43: ENGINE ELECTRICALElectronic Fuel In
Page 44 and 45: ENGINE ELECTRICALPower Up Testing -
Page 46 and 47: ENGINE ELECTRICALPower Up Testing -
Page 48 and 49: ENGINE ELECTRICALAlternator Control
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Page 56 and 57: ENGINE ELECTRICALSystem III - Elect
Page 62 and 63: ENGINE ELECTRICALSystem 111- Electr
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Page 70 and 71: ~(J)~OR/6lKSTATOR RESISTANCES 1'10%
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