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 MANUALSHYUNDAI2013GENESIS COUPE 2.0T PREMIUMREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (ENGINE CONTROL SYSTEM (DTC TROUBLESHOOTING) (1 OF 4) - 3.8L)DTC P0123: THROTTLE POSITION SENSOR 1 SIGNAL CIRCUIT HIGH INPUTSIGNAL CIRCUIT INSPECTION

2013 Hyundai Genesis Coupe 2.0T Premium

Signal Circuit Inspection

2013 Hyundai Genesis Coupe 2.0T PremiumSECTION Signal Circuit Inspection

WARNING: This page is about a different car, the 2012 Hyundai Genesis Coupe. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage
1. Ignition "OFF" and disconnect ETC Motor and TPS connector.
2. Ignition "ON".
3. Measure voltage between TPS1 signal terminal of ETC Motor and TPS harness connector and chassis ground.
  Specification: Approx. 5V
  
  Fig 1: Measuring Voltage Between TPS1 Signal Terminal Of ETC Motor & TPS Harness Connector & Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
4. Is the measured voltage within specification?
  YES
  - Go to "Check open in harness " procedure.
  NO
  - Go to "Check short to battery in harness " procedure.
Check open in harness
1. Ignition "OFF" and disconnect ETC Motor and TPS connector and ECM connector.
2. Measure resistance between TPS1 signal terminal of ETC Motor and TPS harness connector and TPS1 signal terminal of ECM harness connector.
  Specification: Below 1Ω
  
  Fig 2: Measuring Resistance Between TPS1 Signal Terminal Of ETC Motor & TPS Harness Connector & TPS1 Signal Terminal Of ECM Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
3. Is the measured resistance within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Repair open in harness, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check short to battery in harness
1. Ignition "OFF" and disconnect ETC Motor and TPS connector and ECM connector.
2. Measure resistance between TPS1 signal and TPS power terminals of ETC Motor and TPS harness connector. (Measurement "A")
3. Measure resistance between TPS1 signal and ETC motor (+) terminals of ETC Motor and TPS harness connector. (Measurement "B")
4. Measure resistance between TPS1 signal and ETC motor (-) terminals of ETC Motor and TPS harness connector. (Measurement "B")
  Specification: Infinite
  
  Fig 3: Measuring Resistance Between TPS1 Signal & TPS Power Terminals Of ETC Motor & TPS Harness Connector (Measurement "A")
  Courtesy of HYUNDAI MOTOR CO.

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.