LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Kia >> 2020 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 6) (PHEV) >> DTC P0123-00: Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input >> Wiring Inspection >> Ground Circuit Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Ground Circuit Inspection

  1. Ignition "OFF".
  2. Disconnect Battery (-) terminal.
  3. Refer to "ETC (ELECTRONIC THROTTLE CONTROL) SYSTEM " and disconnect Throttle Body connector.
  4. Measure resistance between Pin No. 3 (Ground) terminal of Throttle Body harness connector and chassis ground.

    Specification:  Approx. below 1Ω

  5. Ignition "OFF".
  6. Disconnect Battery (-) terminal.
  7. Refer to "ENGINE CONTROL MODULE (ECM) " and disconnect ECM/PCM connector.
  8. Measure resistance between Pin No. 3 (Ground) terminal of Throttle Body harness connector and Pin No. 59 (Ground) terminal of ECM/PCM harness connector.

    Specification:  Approx. below 1Ω

  9. Is the measured value within specification?

    YES 

    NO 

scientia non olet · About LEMON Manuals