How To Test The Alternator (1998-2002 2.0L Mazda 626)

TEST 2: Checking The EGI INJ Fuse

If you've reached this point, you've confirmed that your Mazda 626's alternator is not charging the battery. In other words, in TEST 1 you confirmed that the battery voltage is at 12.5 Volts (or under) with the engine running.

In this test we're going to check that the EGI INJ fuse is not blown. This fuse is a 30 Amp fuse and is the pink colored fused that the orange arrow, in the illustration above, points to.

This is what you'll need to do:

1. 1

   Locate the underhood fuse and relay box and remove its dust cover.

2. 2

   Locate the 30 Amp EGI INJ fuse. This fuse is identified by the arrow in the illustration above.

3. 3

   Remove the fuse and visually inspect it. Make sure that the fuse is NOT blown.

Let's take a look at what your results mean:

CASE 1: The 30 Amp EGI INJ fuse is NOT blown. This is the correct and expected test result. The next step is to check the 10 Amp METER fuse in the under-dash fuse box. For this test, go to: TEST 3: Checking The METER Fuse.

CASE 2: The 30 Amp EGI INJ fuse is blown. Replace the fuse with another 30 Amp fuse and retest the alternator per the instructions in TEST 1.

Replacing the 30 Amp fuse (if it's blown) should solve your No Charge condition. You'll have to investigate the reason this mega fuse blew, since they don't get blown for no particular reason.

TEST 3: Checking The METER Fuse

In this last test, we are going to make sure that the METER fuse is not blown. This fuse is located in the fuse box under the dashboard.

The METER fuse is the one labeled with the number 4 in the illustration above and is a 10 Amp fuse.

This is what you need to do:

1. 1

   Locate the METER fuse, which will be located in the under-dash fuse box inside your Mazda 626.
   
   The METER fuse of the under-dash fuse box is the number 4 fuse.

2. 2

   Once you have located the 10 amp METER fuse, remove it and check that it's not blown.

3. 3

   If it is blown, replace it with a new one and repeat TEST 1.

Let's take a look at what your test results mean:

CASE 1: The METER fuse is NOT blown. This is good and let's you know that the alternator has all of the power sources it needs to charge, since it isn't, this result also let's you know that the alternator is bad and needs to be replaced.

CASE 2: The METER fuse IS blown. Replace the fuse with another of the same amperage rating (10 amps) and start the car and check to see if the alternator is now charging the battery by repeating TEST 1.

More 2.0L Mazda Test Articles

If this tutorial was helpful, check out the other Mazda 2.0L tutorials that I've written. You can find them all here: Mazda 2.0L Index Of Articles.

Here's a small sample of the tutorials you'll find in the index:

• How To Test For A Blown Head Gasket (2.0L Mazda 626).
• How To Test The MAF Sensor (1996-1997 2.0L Mazda 626).
• How To Test The TPS (1994-2002 2.0L Mazda 626).
• How To Test The MAF Sensor (1996-1997 2.0L Mazda 626).
• How To Test The Fuel Pump (1994-1999 2.0L Mazda 626).