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 MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROL SYSTEM DIAGNOSIS (3.5L) (1 OF 2))DTC TROUBLESHOOTING PROCEDURESDTC P0118: ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUTSIGNAL CIRCUIT INSPECTION

2005 Hyundai Santa Fe GLS, 2.7 D, AWD

Signal Circuit Inspection

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION Signal Circuit Inspection

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

Check reference voltage to ECT sensor
1. Ignition "OFF"
2. Disconnect ECT sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 3 of the ECT sensor harness connector and chassis ground.
  Specification : Approx. 5V
  
  Fig 1: Measuring Voltage Between Terminal 3 Of ECT Sensor Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is the measured voltage within specifications?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Go to next step .
Check for short to battery in harness
1. Ignition "OFF"
2. Disconnect ECT sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminals 3 and 2 of the ECT sensor harness connector and chassis ground.
  Specification : Infinity
  
  Fig 2: Measuring Resistance Between Terminals 3 And 2 Of ECT Sensor Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is the measured resistance within specifications?
  YES
  - Go to next step .
  NO
  - Check for short to battery in signal harness. Repair as a necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for open in harness
1. Ignition "OFF"
2. Disconnect ECT sensor connector
3. Measure resistance between terminal 3 of the ECT sensor harness connector and 4/C121-B of the PCM harness connector.
  Specification : Approx. below 1Ω
  
  Fig 3: Measuring Resistance Between Terminal 3 Of ECT Sensor Harness Connector And 4/C121-B Of PCM Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
4. Is the measured resistance within specifications?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Check for open in harness between ECTS connector and PCM connector. Repair or replace as a necessary and then, 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.