ASE A6 Exam Graded A+

OBD2 P C B U - ANSWER-Body Chassis Power U-Network VM - ANSWER-connected in parallel Ammeter - ANSWER-connected in series or can damage OBD2 First Digit - ANSWER-0-Universal 1-OEM 2nd digit system Short within component - ANSWER-resistance less than spec short to power - ANSWER-items operate unintentionally or not at all, due to worn wiring or such. If a component is shorted, resistance should be less than specified. short to ground - ANSWER-fuse will blow but if short is before switch then comp. will remain on all the time Short finder - ANSWER--You can make one or purchase one. - an easier way to find a short, it uses a small resetting circuit breaker and a compass. use the breaker in place of the blown fuse and move the compass along that circuit the more the needle moves the closer you are when you pass the short it will stop. Ohms Law - ANSWER-E=IxR . R=E/I . I=E/R E think electromagnetic pressure voltage, R obv resistance, I think intensity current Series Circuit Laws - ANSWER--voltage is what is used across all loads -amperage is same everywhere -rest. add up all the restists Parallel Series Laws - ANSWER--voltage dropped across each parallel circuit is same as source to each branch -current is sum of branch currents -rest complicated Voltage same across each component in parallel circuit. Parasitic Drain - ANSWER-30-50 mA for a battery Diodes - ANSWER-used to rectify AC to DC. can check with ohmmeter, high rest in one direction only hydrometer battery - ANSWER-green - fully charged dark needs charging cuz level not high enough to show light or yellow replace SOC test - ANSWER-70F Below 12.4V inaccurate test, charge first Load test - ANSWER-70F 9.6V min. bounce back to 12 gravity - ANSWER-1.260 - 1.280 each cell at 80F Battery to Starter Voltage Drop Test to test battery high current cables or starter relay - ANSWER-First disable fuel system B+ (battery) and to starters large battery cable terminal while cranking, no more than .5 to 1V VM +lead to starter case and VM- cable to B- expect even less voltage drop. more starter testing - ANSWER-can also remove starter and apply 12V to it. Can also measure current draw in battery negative cable. Alternator no or low charge causes - ANSWER-broken/slipping belt, defective diodes, bad voltage regulator, stator windings, open alt field circuit, excessive resistance or open in wiring between alt and battery and sulfated battery plates overcharging - ANSWER-bad voltage regulator, shorted to ground field wire, faulty sensing circuit wire or internally shorted battery short light bulb life battery continually needs water Alt belt pulley - ANSWER-inspect Charging system test - ANSWER-first ensure 12.4V and test battery Start, go to rpm. Should be 2V higher 13.8-14.5V normal unless exotic car Positive and neg side voltage drop should not exceed .5V