2.) How To Test The Fuel Pump In 2 Tests (1.6L Honda Civic), 1996-1998 Fuel Injector Circuit Diagram (1.6L Honda Civic), 1996-1998 EGR Valve Circuit Diagram (1.6L Honda Civic), “Math is fun, it teaches you life and death information... like when you’re cold, you should go to a corner since it’s 90° there.”Anonymous, Home | However, when I test the voltage when the engine is off, it is at 12.55V. I did the Voltage drop tests and found that positive side (alternator output to battery positive) was 0.03V drop and up to 0.08V when I turned on the lights (to get the alternator to increase total Voltage). Or 12.5 Volts that will decrease the longer the engine stays running. OK, let's interpret your multimeter test results: CASE 1: Your multimeter registered 13.5 to 14.5 Volts. Whenever you turn on the headlights (night driving), they glow very dim. The A/C will initially work and then the PCM commands it to de-activate (making you think you've got A/C compressor problems). 10+ Year Member. keep the engine running for about 10 minutes while you perform this test. With the black multimeter test lead, probe the negative battery terminal on your Honda Civic's battery. Or 12.5 Volts that will decrease the longer the engine stays running. We'll do this by simply checking the battery's voltage with your Civic's engine running and your multimeter set to Volts DC mode. It will only crank and start if you jump start your Civic. If the alternator is outputting max voltage but the battery is sucking up the voltage for charging, the system voltage will drop lower than normal until the battery is fully charged. This is a clear indication that your Honda Civic's alternator IS NOT charging the battery. The voltage will decrease from 12.5 Volts DC to 10-9 Volts DC the more stuff you turn on and the longer your Honda Civic stays running. For example: Turn on the A/C or heater on high, turn on the windshield wipers, turn on the headlights, turn on everything and anything that uses electricity inside and outside of the vehicle. Jeep | The. Turning on the headlights will produce charging voltage if the alternator is good. When you do the test on your Honda Civic, it will be an On Car Test, so don't remove the alternator from the car. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! Do NOT follow this link or you will be banned from the site! We have changed the alternator twice ... My 05 honda civic ex battery light came on, then went off, immediately followed by the check engine light. Will put it here even though it is in the link under the avatar. When looking for how to replace a battery, I learn a few more things about alternator and battery voltage. Honda has been using the eld system since the mid 90's. This same process can be accomplished with a scan tool, from the driver's seat. Your multimeter is gonna' register one of two possible readings and they are: You must log in or register to reply here. The magazine automotive repair shop owners and technicians read first to learn about the latest tools and equipment in the automotive aftermarket that can increase productivity in the shop and maximize billable hours. 2012 Honda Civic Charging System Testing The alternator control on the 2012 Civic consists of single wire Lin bus controlled alternator, a battery load sensor, the instrument cluster and the PCM. If the alternator is outputting max voltage but the battery is sucking up the voltage for charging, the system voltage will drop lower than normal until the battery is fully charged. The closest thing I found is that the main fuse coming from the alternator to the car's electrical system is 125A. GM | For a better experience, please enable JavaScript in your browser before proceeding. Ford | There have been instances where these alternators have been replaced for no charge output at idle. Even way back then, I kept saying "You have to know your OPPONENT". I jumped it and let it run while I locked up the shop and then drove home (12-14 minute drive home). Ugh, stupid Honda. CASE 2: Your multimeter registered a voltage that steadily dropped down to 9 Volts. On the negative side (battery negative to alternator exterior) I got no drop at all under either condition. If I remember correctly. All Rights Reserved. Tools | 1.) 9 hours later, I go to leave and it is dead as a door nail. As you're keeping an eye on your multimeter's display screen, this is what you'll see: Top. ALTERNATOR TEST 1: Testing Battery Voltage With A Multimeter, ALTERNATOR TEST 2: Testing The Continuity Of The Bat (+) Circuit, ALTERNATOR TEST 3: Checking The Alternator Fuse. Replacing the alternator at this point usually solves around 90% of the No Charge conditions on any 1.7L Honda Civic around the world. I tried multiple times and it is consistently so. Disclaimer. Jeep | The first is the alternator output rating, which is the amount of current that a unit is capable of producing at a specific rotational speed. It is completely normal that there would be no charging output at idle. The idle may get high when you come to a stop. The charge light (also known as the battery light) will be shining nice and bright on your Civic's instrument cluster. 2001-2005 Crank Sensor Wiring Diagram (Honda 1.7), How To Test The Starter Motor (2001-2005 1.7L Honda Civic), How To Test For A Blown Head Gasket (2001-2005 1.7L Honda Civic), “Don’t worry about avoiding temptation. Disclaimer. One last thing before we start, you'll notice that the photos I'm using in this article show the alternator off of the Honda Civic but this is just to make the explanation of the test easier. CASE 2: Your multimeter registered a voltage that steadily dropped down to 9 Volts. If you think it is voltage regulator, then you will The alternator control on the 2012 Civic consists of single wire Lin bus controlled alternator, a battery load sensor, the instrument cluster and the PCM. © 2020 CarGurus, Inc., All Rights Reserved. This material may not be reproduced without the author’s consent. Jeep | Your 1.7L Honda Civic's alternator fulfills two basic requirements: One is to charge the battery so that you crank and start the car each and every time you need to.
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