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Knock sensor problems for 2001 Kia Sportage


USAFVetCruz

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My girlfriend has a 2001 Kia Sportage that is having problems. The check engine light came on so i got a readout to see what was causing the check engine light to come on. It said the knock sensor was bad so I replaced it and the car ran great for 2 days then the check engine light came back on and once again it is tellling me the knock sensor is bad. Seeing how I need to eliminate the check engine light in order to pass a CA.smog test in order to register the vehicle //which is due very soon\\  I need to resolve this issue. Any suggestions?

 

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knock sensors function is to listen for unusual noise such as misfire ....

 

Testing for bad sensor is simple 

 

1 WITH THE KNOCK SENSOR STILL CONNECTED CONNECT A VOLTMETER BETWEEN THE (TERMINAL 3) YELLOW /GREEN WIRE AND A GROUND SOURCE

2 TURN IGNITION ON

3 TAP THE ENGINE CROSS MEMBER OR A PART OF THE CAR ATTACHED CLOSEST TO THAT AREA WITH A WRENCH

4 VERIFY THERE IS A VOLTAGE SPIKE LESS THEN 1VOLT FROM THE KNOCK SENSOR

5 IF THERE IS NO VOLT SPIKE YOU HAVE A BAD SENSOR

 

ALSO YOU CAN RUN THE ENGINE AND LISTEN FOR YOUR SELF OF ANY UNUSUAL SOUNDS COMING FROM THE ENGINE

SUCH AS SOMETHING LOOSE /BAD HARMONIC BALANCER / MISFIRE OR SPUTTER/ PULLEY NOISE OR WATER PUMP

 

IF IT IS GOOD SOMETHING IS BANGING WHEN DRIVING AND SETTING IT OFF

WHEN YOU READ THE CODE IF YOUR SCANNER WILL ALLOW CHECK AND SEE AT WHICH POINT IT IS THROWING THE CODE 

MOST LIKELY ITS AT COLD START

 

CHANGE THE SPARK PLUGS AND REPLACE WITH OEM PLUGS ONLY

 

GOOD LUCK

Edited by loaderXI
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Where did you buy the sensor?

use OEM sensor they may cost more but they have less problems with them

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Wire could also be grounded..... there for you would not see voltage!!

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I'm with budman on this issue  12yr old wiring harness is showing its age

 

may have to re-wire sensor back to computer

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Is it knocking?

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