How To Test The MAP Sensor (1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 4.8L, 5.3L, 6.0L Chevrolet Silverado, Suburban, Tahoe And GMC Sierra, Tahoe, Tahoe XL)

The manifold accented pressure (MAP) sensor, on the 1999-2006 V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon 40) can be easily tested with a simple multimeter.

In this tutorial, I'll explain how to exercise it in a step-past-step fashion. You'll be able to easily find out if it's bad (or non) in 3 simple tests.

En Español You can detect this tutorial in Spanish hither: Cómo Probar El Sensor MAP (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon) (at: autotecnico-online.com).

Notation: This tutorial applies to the following vehicles:

Chevrolet:

  1. Silverado (1500, 2500):
    1. 4.8L, v.3L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
  2. Silverado (2500):
    1. vi.0L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
  3. Suburban (1500):
    1. 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
  4. Suburban (2500):
    1. half-dozen.0L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
  5. Tahoe:
    1. 4.8L, 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006

GMC:

  1. Sierra (1500, 2500):
    1. iv.8L, 5.3L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
  2. Sierra (2500):
    1. 6.0L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
  3. Yukon:
    1. 4.8L, v.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
  4. Yukon XL (1500):
    1. five.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
  5. Yukon 40 (2500):
    1. 6.0L: 2000, 2001, 2002, 2003, 2004, 2005, 2006

RELATED TROUBLE CODES:

  1. P0106 -What Does It Mean? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon).
  2. P0107 -What Does Information technology Mean? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon).
  3. P0108 -What Does It Mean? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon).

Symptoms Of A Bad MAP Sensor

A manifold accented pressure (MAP) sensor trouble will ever cause the check engine light with one of the post-obit trouble codes:

  1. P0106: MAP Sensor Performance Trouble.
  2. P0107: MAP Sensor Voltage Also Low.
  3. P0108: MAP Sensor Voltage Too High.

You're besides going to see one or more of the following symptoms:

  1. Won't pass the state mandated emissions exam.
  2. Bad gas mileage.
  3. Lack of power, rough idle, or hesitation.
  4. Engine cranks a long fourth dimension before starting.

MAP Sensor Excursion Descriptions

MAP Sensor Pin Out. How To Test The MAP Sensor (1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 4.8L, 5.3L, 6.0L Chevrolet Silverado, Suburban, Tahoe And GMC Sierra, Tahoe, Tahoe XL)

Below are the circuit descriptions of the 3 wires of the MAP sensor'southward connector.

Terminal Wire Description
A Orange with black stripe (ORG/BLK) Sensor Footing
B Lite greenish (LT GRN) MAP Signal
C Grey (GRY) 5 Volts

Where To Buy The MAP Sensor And Relieve

The MAP sensor, on the 1999-2006 V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL), is not an expensive engine management component.

The following links will assist you to comparison store and hopefully salve you a few bucks on its purchase (AC-Delco is the original equipment manufacturer):

Note: The higher up manifold absolute pressure (MAP) sensor fits the following vehicles: 1999-2006 V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon Forty).

TEST i: Testing The MAP Voltage Signal

Testing The MAP Voltage Signal. How To Test The MAP Sensor (1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 4.8L, 5.3L, 6.0L Chevrolet Silverado, Suburban, Tahoe And GMC Sierra, Tahoe, Tahoe XL)

To go this bear witness on the road, we're gonna' test the MAP voltage signal and run into if information technology decreases/increases as you apply/release vacuum to the sensor.

If the MAP sensor is skilful, the MAP voltage signal should decrease when you apply vacuum to the sensor and increment when you lot release that vacuum.

If the MAP sensor is bad, you'll see that the MAP voltage betoken will stay stuck in 1 value every bit yous employ/release vacuum to the sensor.

IMPORTANT: The MAP sensor must remain connected to its electrical connector for this test to part properly. To be able to access the voltage inside the signal wire, you'll need to apply either a dorsum probe or a wire piercing probe. Yous can see an example of this tool here: Wire Piercing Probe.

Let's get started:

  1. 1

    Remove the MAP sensor from the intake manifold. If yous had to disconnect the MAP sensor from information technology'due south electric connector to remove it, reconnect it at present (the MAP sensor must remain connected to its connector for this test).

  2. 2

    Connect the vacuum pump to the MAP sensor's vacuum inlet port.

  3. 3

    Select Volts DC Mode on your multimeter.

  4. 4

    Connect the red multimeter examination lead to the middle wire of the MAP sensor'due south connector.

    In the photograph higher up I've identified the heart wire with the number 2.

    Note: The MAP sensor must remain connected to its electric connector to test the MAP indicate voltage.

  5. 5

    Ground the black multimeter exam lead on the bombardment negative (-) concluding.

  6. six

    Accept your helper plough the key On but don't get-go the engine.

  7. vii

    You should see a voltage around 4.5 Volts DC registering on your multimeter. If it doesn't, don't worry about it just nonetheless, proceed with the other steps.

  8. 8

    Utilise vacuum to the MAP sensor till the judge'southward needle reaches 5 in. Hg of vacuum. These are the approximate readings you should come across as yous utilize vacuum to the sensor:

    1.) 0 in. Hg ...... 3-four Volts.

    ii.) v in. Hg ...... 2.iv Volts.

    3.) 10 in. Hg .... one.nine Volts.

    4.) 15 in. Hg .... 1.4 Volts.

  9. 9

    Release the vacuum you've applied. The voltage reading should go back up to the value y'all registered in pace 7.

Let's analyze your test results:

CASE 1: Equally you lot practical/released vacuum, the voltage decreased/increased. This is the correct test consequence and it tells you that the MAP sensor is OK.

Now, if the MAP sensor trouble code won't go abroad, accept a expect at the info establish at: MAP Sensor Code Won't Go Abroad for a few more suggestions every bit to what could be causing the MAP sensor diagnostic trouble code (DTC).

CASE two: As you applied/released vacuum, the voltage DID Not subtract/increment. This test issue normally confirms that the MAP sensor is bad and that it needs to be replaced.

But before you replace information technology, the adjacent step is to brand certain it's getting v Volts and Ground. Get to: Examination 2: Making Certain The MAP Sensor Is Getting 5 Volts.

CASE iii: The multimeter DID Non register whatsoever voltage. This isn't good, simply doesn't condemn the manifold absolute pressure level (MAP) sensor every bit bad yet.

The next test is to make sure that the MAP sensor is getting 5 Volts. Get to: Examination 2: Making Certain The MAP Sensor Is Getting 5 Volts.