Testing the knock sensors can seem fairly the difficulty, considering that they"re situated under the intake manifold.

You are watching: How to test a knock sensor chevy

But you deserve to test them without rerelocating the intake manifold and also with simply a basic multimeter.

In this tutorial I"ll present you how. You"ll have the ability to conveniently discover out if one or both knock sensors are poor or not.


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You have the right to discover this tutorial in Spanish here: Cómo Probar Los Sensores De Detonación (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon) (at: autotecnico-virtual.com).

NOTE: This tutorial uses to the adhering to vehicles:

Chevrolet:

Silveraexecute (1500, 2500):4.8L, 5.3L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006Silveracarry out (2500):6.0L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006Suburban (1500):5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006Submetropolitan (2500):6.0L: 2000, 2001, 2002, 2003, 2004, 2005, 2006Tahoe:4.8L, 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006

GMC:

Sierra (1500, 2500):4.8L, 5.3L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006Sierra (2500):6.0L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006Yukon:4.8L, 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006Yukon XL (1500):5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006Yukon XL (2500):6.0L: 2000, 2001, 2002, 2003, 2004, 2005, 2006

RELATED TROUBLE CODES:

Symptoms Of A Bad Knock Sensor

When the knock sensor falls short, the fuel injection computer will certainly light up the check engine light with one (or both) of the adhering to trouble codes:

P0327 Knock Sensor No. 1 Circuit Problem.P0332 Knock Sensor No. 2 Circuit Problem.

You"re likewise going to check out one or more of the adhering to symptoms:

Engine knock (ping) when accelerating the car.Lack of power once accelerating under load.The auto will certainly not pass the eobjectives test.

Knock Sensor Wiring Harness Connector Pin Out


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Below are the circuit descriptions of the 2 wires of the knock sensors jumper wiring harness.

The knock sensors jumper wiring harness connector is situated on the left side (driver side) of the intake manifold. See photo 2 of 2 in the image viewer above.

TerminalWireDescription
ADark blue (DK BLU)Knock Sensor No. 1 Signal
BLight blue (LT BLU)Knock Sensor No. 2 Signal

Wright here To Buy The Knock Sensor And Save

If you uncover that one knock sensor is poor, then it"s recommfinished that you need to rearea both and also their wiring harness.

Since you"ll need to rerelocate the intake manifold to accessibility the knock sensors, I desire to likewise recommend that you avoid buying cheap brand-X knock-off knock sensors.

The complying with web links will help you comparison shop for these items of well-known brand names (AC-Delco, Dorguy, Standard Motor Products):


NOTE: The above knock sensor and connected components fit the following vehicles: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 V8 Chevrolet Silverado, Suburban, Tahoe and also GMC Sierra, Tahoe, Tahoe XL.

TEST 1: Testing Knock Sensor 1 (Front Sensor)

Testing knock sensor 1 ssuggest entails experimentation its resistance via a multimeter in Ohms mode.

The wire that we"re gonna" test, to check the interior resistance of knock sensor 1, is the dark blue (DK BLU) wire of the connector in the photo above.

In the photo over, I"ve labeled the DK BLU wire via the letter A.

RESISTANCE SPECIFICATION: The resistance specification of knock sensor 1 is 93 to 107 K Ohms.

Let"s acquire started:


1

Place your multimeter in Ohms mode.


2

Disattach the knock sensors jumper wiring harness.The knock sensors jumper wiring harness is situated on the left side (driver side) of the intake manifold. See photo above.


3

Connect the red multimeter test result in the male terminal that connects to the dark blue (DK BLU) wire of the connector.The DK BLU wire is determined with the letter A in the photo over.NOTE: This test is done on the knock sensors jumper wiring harness connector that has actually male spade terminals.


4

Ground the black multimeter test lead straight on the battery negative (-) article.


5

You must view a resistance worth between 93 to 107 K Ohms on your multimeter.

Let"s analyze your test results:

CASE 1: The resistance of knock sensor 1 is within the indicated range. This is the correct test result and also it allows you understand that knock sensor 1 is good.

You have the right to likewise conclude that tright here are no wiring difficulties with the knock sensors jumper wiring harness.

If the engine is knocking (pinging), then this test outcome allows you recognize that the resource of the problem is an engine mechanical problem.

CASE 2: The resistance of knock sensor 1 IS NOT within the indicated range. This test outcome mainly allows you recognize that knock sensor 1 is poor and demands to be replaced.

The next action is to remove the intake manifold and:

Visually inspect knock sensor 1 and watch if it"s damaged or corroded.Visually inspect the knock sensors jumper wiring harness for damages or corrosion.

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Relocation any component that is damaged/corroded.