Actron CP7677 Operating Instructions Manual

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Actron CP7677 Operating Instructions Manual Manual pdf 14 page image

14• If you hear tone - The switch isclosed.• If you don’t hear tone - The switchis open.8. Repeat Step 7 to verify switch op-eration.Good Switch: Tone turns ON andOFF as you operate switch.Bad Switch: Tone always ON or tonealways OFF as you operate switch.4. Connect BLACK test lead to oneside of coil.5. Connect RED test lead to otherside of coil.6. View reading on display.• Typical solenoid / relay coil resis-tances are 200Ω or less.• Refer to vehicle service manual foryour vehicles resistance range.7. Test ResultsGood Solenoid / Relay Coil: Displayin Step 6 is within manufacturersspecification.Bad Solenoid / Relay Coil:• Display in Step 6 is not within manu-facturers specifications.• Display reads overrange on everyohms range indicating an open cir-cuit.NOTE: Some relays and solenoidshave a diode placed across the coil.To test this diode see Testing Di-odes on page 11.1. Insert BLACK test lead into COMtest lead jack.2. Insert RED test lead intotest lead jack.3. Turn multimeter rotary switch to200Ω function.Most solenoids and relay coil resis-tances are less than 200Ω. If meteroverranges, turn multimeter rotaryswitch to next higher range. (seeSetting the Range on page 6)This test checks to see if a solenoid orrelay have a broken coil. If the coil testsgood, it is still possible that the relay orsolenoid are defective. The relay canhave contacts that are welded or worndown, and the solenoid may stick whenthe coil is energized. This test does notcheck for those potential problems.To test Solenoids and Relays (see Fig.18):Relay orSolenoidRed BlackFig. 18Testing Solenoids and Relays