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Adin3, Nissan Mechanic
Category: Nissan
Satisfied Customers: 3423
Experience:  Autozone Manager 3 years, mechanic 10 years
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2002 nissan xterra: service engine soon..The diagnostic codes..Knock

Resolved Question:

I have received a service engine soon light in my 2002 nissan xterra. The diagnostic codes read: Knock engine sensor and IAT sensor. Please advise how I shoul proceed.
Submitted: 6 years ago.
Category: Nissan
Expert:  Adin3 replied 6 years ago.

Hello and thank you for choosing Just Answer.

Do you have the specific codes that you pulled from the diagnostic?

Customer: replied 6 years ago.
Yes: P0328 and P0127. I reset the codes they reappeared 80 miles later
Expert:  Adin3 replied 6 years ago.

Thank you. If you are getting the P0328 you should replace the knock sensor. I would hold off on the IAT, first change the knock sensor (common sensor that goes out) reset the codes and see if the p127 comes back.

Trouble Code: P0328 Knock Sensor Circuit High Input (Bank 1)

Possible Causes:

  • Knock sensor signal circuit is open
  • Knock sensor signal circuit is shorted to VREF or system power
  • Knock sensor is damaged or has failed
Adin3, Nissan Mechanic
Category: Nissan
Satisfied Customers: 3423
Experience: Autozone Manager 3 years, mechanic 10 years
Adin3 and 9 other Nissan Specialists are ready to help you
Customer: replied 6 years ago.
To remove the knovk sensor the air intake manifold must be removed. Is there a way to test the knock sensor. The voltage from the sensor to the computer should be 2.4 volts. Is there a way to test at the computer. It should be a green wire entering the left side of the computer housing.
Expert:  Adin3 replied 6 years ago.

Actually that is the only way to test it manually.

  • Start engine and run at idle.

  • Measure voltage at ECM pin 64.

  • Voltage should be approximately 2.4 vDC.

  • The way we would measure it here at the shop is by doing a freeze data on the car.

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