Actron SunPro CP7678 Operating Instructions Manual

Also see for SunPro CP7678: Operating instrucktions

Actron SunPro CP7678 Operating Instructions Manual Manual pdf 31 page image

250V MAX15A MAXFUSEDCOMDC15A20M200K20K2K 200 8CYL6CYL TACHX105CYL4CYL8CYLOHMS15A31Position Type SensorsPosition sensors are potentiometers or a type ofvariable resistor. They are used by the computer todetermine position and direction of movement of amechanical device. Typical position sensor applica-tions are throttle position sensors, EGR valve posi-tion sensors, and vane air flow sensors.• If multimeter overranges on largestrange, then sensor is an open circuitand is defective.7. Move RED test lead to sensor SIG-NAL pin.• Refer to vehicle service manual forlocation of sensor SIGNAL pin.8. Operate Sensor.Throttle Position Sensor:• Slowly move throttle linkage fromclosed to wide open position.• Depending on hook-up, the displayreading will either increase or de-crease in resistance.• The display reading should either startat or end at the approximate resis-tance value measured in Step 6.• Some throttle position sensors havean Idle or Wide Open Throttle (WOT)switch in addition to a potentiometer.Fig. 32Test Procedure (see Fig. 32):1. Insert BLACK test lead into COM testlead jack.2. Insert RED test lead into testlead jack.3. Disconnect wiring harness from sen-sor.4. Connect Test Leads.• Connect RED test lead to sensor POWERpin.• Connect BLACK test lead to sensorGROUND pin.• Refer to vehicle service manual for loca-tion of sensor POWER and GROUNDpins.5. Turn multimeter rotary switch to 20KΩrange.6. View and record reading on display.• Display should read some resistancevalue.• If multimeter is overranging, adjust therange accordingly. (See Setting theRange on page 6.)Typical Toyota ThrottlePosition SensorRed BlackPOWER GROUNDSIGNAL IDLE SWITCH• To test these switches, follow the Test-ing Switches test procedure on page 13.• When you are told to operate switch,then move throttle linkage.Vane Air Flow Sensor:• Slowly open vane “door” from closed toopen by pushing on it with a pencil orsimilar object. This will not harm sensor.• Depending on hook-up, the display read-ing will either increase or decrease inresistance.• The display reading should either startat or end at the approximate resistancevalue measured in Step 6.• Some vane air flow sensors have an idleswitch and an intake air temperaturesensor in addition to a potentiometer.• To test idle switch see Testing Switcheson page 13.• When you are told to operate switch,then open vane “door”.• To test intake air temperature sensor seeTemperature Type Sensors on page 30.