Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSKIA2015OPTIMA SX TURBOREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 107 (ENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 3) - 2.4L (EXCEPT HEV))DTC P0326: KNOCK SENSOR 1 CIRCUIT RANGE/PERFORMANCE (BANK 1 OR SINGLE SENSOR)WIRING INSPECTIONSIGNAL CIRCUIT INSPECTION

2015 Kia Optima SX Turbo

Signal Circuit Inspection

2015 Kia Optima SX TurboSECTION Signal Circuit Inspection

WARNING: This page is about a different variant/trim than selected.

Check for short to ground in signal circuit
1. Measure resistance between signal terminal of the sensor harness connector and chassis ground.
  Specification : Infinite
2. Is resistance within the specification?
  YES
  - Go to next step as indicated below.
  NO
  - Check signal circuit for short to ground. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to power in signal circuit
1. Disconnect PCM connector
2. Ignition "ON" & Engine "OFF"
3. Measure voltage between signal terminal of sensor harness connector and chassis ground.
  Specification : Approx. 0V
4. Is voltage within the specification?
  YES
  - Go to next step as indicated below.
  NO
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for open in signal harness
1. Ignition "OFF"
2. Measure resistance between signal terminal of sensor harness connector and Knock signal terminal of the PCM harness connector.
  Specification : Approx. 0Ω
3. Is resistance within the specification?
  YES
  - Go to next step as indicated below.
  NO
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.