Tip & How-To about 2000 Toyota Corolla

How to change the Alternator in a Toyota Corolla car.

The Car uses an alternator to run electricaldevices in your vehicle while the engine is running.The alternator assemblyhelps the voltage regulator to to maintain the steady voltage.
1) Before buying new alternator ,first of all determine which alternator your car needs.Car models made from 1966 to 1970 have a 1.1 L or 1.2 L engine. Models from 1970 to 1978 have a 1.2 L, 1.4 L or 1.6 L engine. Models from 1979 to 1987 have 1.3 L, 1.6 L or 1.8 L diesel engine. Models 1988 to 1992 options include a 1.3 L, 1.5 L, 1.6 L or 2.0 L diesel engine. Models made from 1993 to 1997 also offer a 1.8 L engine. Models from 1998 to 2005 in the United States were available only with a 1.8 L engine. So before buying for new alternator check out this details.
2) The latest Toyota Corolla 2006 has 1.5 L, 1.8 L or 2.4 L engine.
3) After getting the exact alternator for your Toyota car engine. Follow this instructions to replace the alternator in car.
4) First of all disconnect the negative battery cable with a socket wrench. There is a gravel shield blocking the alternator. You will have to remove the gravel shield to access the alternator.The alternator is located under the car.
5) Then you will have to remove the battery terminal wire.to remove the battery terminal wire you will have to remove the electrical connector and loosen the nut on the alternator terminal with a socket wrench. And this will allow you to remove the battery terminal wire.
6) Now you can remove the alternator.to remove the alternator.you will have to remove the drive belt. For that you will have to loosen the two mounting bolts on the alternator with the help of socket wrench and this will help to take the alternator off the vehicle.
7) Now to install the new alternator assembly. You will require the torque wrench to tighten bolt .There are two bolts one is smaller and other is larger.Connect the smaller mounting to 18 foot-lb and the larger mounting to 40 foot-lb.
8) Then carefully connect the electrical harness and battery terminal wire to the alternator and tighten the retaining nut to the alternator terminal with a socket wrench. Install the gravel shield which you removed while removing the old alternator. Reconnect the negative battery cable with a socket wrench.
The above instructions will help you to replace your cars alternator.

Posted by on

2000 Toyota Corolla Logo

Related Topics:

Related Questions:

2 Answers

I have 2003 Saturn Ion and I have bought a new

test the battery voltage while the engine is running, (you'll have to jump it again)
if you know the battery, voltage regulator and alternator are good, you may have to check all the fuse-able links on the car, all the vehicle grounds, and the fuses and relays.
if you put your battery on charge until it is fully charged and let the car sit over night and it is dead, either the battery is internally shorted or the vehicle is drawing far to much current and each circuit tested to find the short.

Oct 01, 2014 | 2003 Saturn ION

1 Answer


Vehicles: any failing to keep its battery charged.

A vehicle unable to charge its own battery has one of 4 problems:
(a) alternator failure
(b) voltage regulator failure
(c) battery failure
(d) wiring problem between battery and alternator/voltage regulator.

One most modern vehicles (including 2002 Lexus RX300 - 2WD and AWD), the voltage regulator is an integral component of the alternator and is not separately serviceable.

In the US, one can get a free "charging system diagnosis" from the popular auto parts chains: AutoZone, Advance Auto Parts & Pep Boys. You needn't remove any parts from the car to get this diagnostic, since they can attach a diagnostic meter to the charging system in the parking lot. This diagnostic aid will tell you exactly which component has failed - battery, alternator or voltage regulator.

In case the vehicle is immobile, one can DIY (do it yourself) the diagnosis.
(a) inspect the wiring for corrosion/loose connections/loose connectors/etc.
(b) check alternator belt/pulley - if drive belt is properly turning the alternator pulley (no slippage/misrouting/etc.), then the mechanical tests are complete, and you'll need to continue testing the electrical performance of the charging system components.
(c) first component to test: battery
DIY test 1: remove battery from car and put battery on a 120VAC automotive battery charger and charge it fully (or just check it in the car with motor off, since the car's charging system is a type of automotive battery charger).
test parameter: a fully charged lead-acid automotive battery should read 12.45 volts on a VOM/DMM
DIY test 2: disassemble battery out of car after driving it to one of the auto parts chain stores (Advance/AutoZone/Pep Boys) for a free battery test. These testers will test the battery under load, which is not possible with just a DMM.
(d) if wiring is good, and battery tests good under load, then
the failed component is the alternator/voltage regulator - by process of elimination.
(e) DIY test 3: direct alternator/voltage regulator test (car must start and idle successfully to perform this test)
Start the car, and put a VOM/DMM across the terminals of the battery. Since the car is running, you'll be reading the output voltage of the alternator and not the output voltage of the battery. The acceptable ranges for alternator/voltage regulator output are:


Most alternators that are charging properly should produce a voltage of about 13.8 to 14.2 volts at idle with the lights and accessories off. Always refer to the vehicle manufacturer's specifications. Many Asian vehicles, for example, have higher charging voltages of around 15 volts.

When the engine is first started, the charging voltage should rise quickly to about two volts above base battery voltage, then taper off, leveling out at the specified voltage.

The exact charging voltage will vary according to the battery's state of charge, the load on the vehicle's electrical system, and temperature. The lower the temperature the higher the charging voltage, and the higher the temperature the lower the charging voltage. The "normal" charging voltage on a typical application might be 13.9 to 15.1 volts at 77 degrees F. But at 20 degrees F. below zero, the charging voltage might be 14.9 to 15.8 volts. On a hot engine on a hot day, the normal charging voltage might drop to 13.5 to 14.3 volts.

Here are the full specs for installation of the 2002 Lexus RX300 alternator - you may be able to check these specs yourself (with a torque wrench), or pass them along to your mechanic.

Note: the VIN 8th digit should be "F" for the 2002 Lexus RX300 (2WD & AWD)

2002 Lexus RX300 (2WD and AWD) - 3.0L Engine, VIN "F" SFI DOHC


Drive belt. Tension the belt to 170-180 lbs. for a new belt or 95-135 lbs. for a used belt.
Adjusting alternator lockbolt. Tighten the bolt to 13 ft.-lbs. (18 Nm).
Alternator pivot bolt. Tighten the bolt to 41 ft.-lbs. (56 Nm).

Glossary of acronyms
DIY = do it yourself
DMM = Digital Multimeter
DOHC = Dual Overhead Cam
SFI = Sequential Fuel Injection
VOM = Volt Ohmmeter

How to test a Car Alternator - todayifoundout.com

Alternator & Charging System Checks - aa1car.com

Dec 26, 2011 | 2002 Lexus RX 300

1 Answer

i have a 1998 montero sport. my lighs started getting real dim, windows go down slow and my anti lock brake came on then the car died. it was almost like the battery was being drained. i made sure everything in my car was turned off and replaced the battery because i did need a new one. the car is still having the same problem so i thought it was the alternator but auto zone said alternator was good and the computer wasn't spitting out any codes that anything was wrong with the vehicle. the only way i can start my car is by jumping it and it wont' run for very long before dying again. this morning when it died the anti lock light came on again and blinkers wouldn't work and i had a hard time pressing the brakes to stop the vehicle. what could possibly be the problem??

Presuming the alternator to be okay, the next logical source for your problem is the alternator voltage regulator. The alternator voltage on cars of your vintage is usually controlled by the engine management computer. The problem could also be in the wiring between the alternator and the battery or between the alternator and its regulator. The one thing for certain is that your problems are all created by the low voltage condition that indicates that no power is coming from the alternator to run the vehicle's electronics. Contrary to popular belief, the alternator does not charge the battery, rather, once the vehicle is running the alternator powers all of the equipment.

Jul 19, 2011 | 2001 Mitsubishi Montero Sport 4WD

2 Answers

my car keeps going dead, purchase a new battery yesterday the brake light and battery light is on will thuis cause car to go dead

YES! You have described a "NO CHARGING SYSTEM VOLTAGE' condition. You should have at least 14 to 14.5 volts at the battery with the engine running. If you don't, there are several possible causes:

1. Blown alternator fuse
2. Electrical cable between alternator & battery is broken or disconnected.
3. Alternator is not working/charging (voltage regulator inside the alternator).
4. Regulator at the alternator is disconnected or an open circuit exists between the alternator's regulator & underhood fuse box.

One quick way to verify "NO CHARGING SYSTEM VOLTAGE" is to start the engine and while it's running, disconnect the NEGATIVE battery cable. The moment you disconnect the cable, the engine will die. If it doesn't, you have a completely different problem -- the battery is dying over-night because there is an electrical drain on the battery after the key is turned off and removed.

If that's the case, and unless you know a good electrician, take it to an authorized Hyundai Service Center and have it properly diagnosed -- best advice I can give you without looking at the vehicle myhself.

You can gain access to Hyundai shop manuals and wiring diagrams by going to www.hmaservice.com and register using the Vehicle's VIN #.

Hope this helps.

Feb 07, 2011 | 2000 Hyundai Accent

3 Answers

i gave a friend a jumo yesterday and my car wont start. No power at all

Is your alternator and your battery the same volts if so then it's your PCM or ECM and do remember that they do need to be program

Jul 22, 2010 | 2005 Nissan Altima

Not finding what you are looking for?

3,705 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

76109 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8270 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions