2.6L Isuzu MAF Sensor Test Amigo, Pick Up, Rodeo (1993-96)

TEST 2: Testing The Power Circuit

The second thing that we'll do is check that your 2.6L Isuzu Pick Up (Rodeo, Amigo) MAF sensor is receiving 10 to 12 Volts.

The procedure I recommend for you to use (to accomplish all of the tests below) is to use a test probe that pierces thru' the wire's insulation (Wire Piercing Probe). DO NOT insert anything into the female terminal.

Whatever method you use, the key here is not to damage the female terminal or the wire. Again, be careful. Use common sense and take all necessary safety precautions.

These are the test steps:

1. 1

   Put your multimeter in Volts DC mode.

2. 2

   Disconnect MAF sensor from its connector.

3. 3

   With the red multimeter test lead and an appropriate tool, probe the MAF sensor connector's A circuit as shown in the photo.

4. 4

   With the black lead of the multimeter probe the battery negative (-) terminal.

5. 5

   Turn the key On, but don't crank or start the engine.

6. 6

   You should see 10 to 12 Volts DC on your multimeter.

Let's interpret your voltage test result:

CASE 1: The multimeter registered 10 to 12 Volts. All is good in the neighborhood since this voltage test result tells you that the MAF sensor, on your 2.6L Isuzu Pick Up (Rodeo, Amigo), is getting power (10 to 12 Volts DC).

Your next test is to make sure the mass air flow (MAF) sensor is getting Ground on the wire labeled with the letter B. For this test, go to: TEST 2: Testing The Ground Circuit.

CASE 2: The multimeter DID NOT register 10 to 12 Volts. The MAF sensor is not the problem. Without this voltage the MAF sensor will not work.

Your next step is to find out why this power is missing and restore it. Restoring power to your Isuzu's MAF sensor will get it back to working.

TEST 3: Testing The Ground Circuit

In the previous test we checked that the mass air flow (MAF) sensor was receiving 12 Volts. Now we'll check that the MAF sensor is getting a good Ground. This Ground is provided by the ECM internally.

NOTE: Since this wire connects directly to the fuel injection computer (to get Ground), be careful and take extreme care not to short-circuit this wire to battery power as you're probing it. Shorting this wire to battery voltage will fry the fuel injection computer on your Isuzu.

OK, these are the test steps:

1. 1

   Put the multimeter in Volts DC mode.

2. 2

   Disconnect MAF sensor from its connector.

3. 3

   With the black multimeter test lead, probe the MAF sensor connector's B wire.

4. 4

   Connect red lead to the battery (+) positive terminal.

5. 5

   Turn the ignition switch to the RUN position.

6. 6

   You should see a voltage of 10 to 12 Volts DC.

Let's analyze the result of your test:

CASE 1: The multimeter registered 12 Volts. All is good in the neighborhood since this test confirms that the MAF sensor, 2.6L Isuzu Pick Up (Rodeo, Amigo), is getting Ground.

You can conclude that the MAF sensor is bad and needs to be replaced if you have:

• Confirmed that the MAF signal is stuck in one value as you accelerate/decelerate the engine (TEST 1).
• Confirmed that the MAF sensor is getting power (TEST 2).
• Confirmed that the MAF sensor is getting Ground (this test section).

CASE 2: The multimeter DID NOT register 12 Volts. The MAF sensor is not the problem. Without a good path to Ground, the MAF sensor will not work.

Finding out why this Ground is not getting to the MAF sensor (and restoring it) will get the MAF back to work and solve the MAF sensor issue.

More 2.6L Isuzu Diagnostic Tutorials

You can find a complete list of 2.6L Isuzu tutorials in this index: Isuzu 2.6L Index Of Articles.

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

• How To Test The Fuel Injectors (2.6L Isuzu Pick Up).
• Blown Head Gasket Test Amigo, Pick Up, Rodeo (1993-96 Isuzu 2.6L).
• How To Test The Isuzu Manifold Absolute Pressure (MAP) Sensor.
• Engine Compression Test (2.6L Isuzu) Amigo, Pick Up, Rodeo (1993-96).