LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Kia >> 1994 >> Sephia LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 12: Throttle Position (TP) Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 12: Throttle Position (TP) Sensor

  1. Check TP sensor connector for poor connection. Clean or repair connector as necessary. If connector is okay, go to next step.
  2. Disconnect TP sensor. Using an ohmmeter, check continuity of Light Green/Red wire between terminals No. 4 of TP sensor connector and No. 6 of ECM C249 (26-pin) connector. Check continuity of Light Green/Orange wire between terminals No. 3 of TP sensor connector and No. 7 of ECM C249 (26-pin) connector. Also, check continuity of Black/Red wire between terminals No. 1 of TP sensor connector and No. 15 of ECM C249 (26-pin) connector. If continuity exists in all readings, go to next step. If continuity does not exist in any reading, locate and repair open in appropriate wire between TP sensor connector and ECM connector.
  3. Measure resistance between terminals No. 1 (Black/Red wire) and No. 3 (Light Green/Orange wire) of TP sensor connector. With throttle closed, resistance should be less than 1000 ohms. With throttle fully open, resistance should be about 5000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, adjust or replace TP sensor. See ADJUSTMENTS article in the ENGINE PERFORMANCE section for TP sensor adjustment procedure.
  4. Measure voltage between ground and terminal No. 7 (Light Green/Orange wire) of ECM C249 (26-pin) connector. With throttle closed, voltage should be about 0.5 volt. With throttle fully open, voltage should be about 4 volts. If voltage is as specified, replace ECM. If voltage is not as specified, locate and repair short in wiring between TP sensor and ECM connector.
scientia non olet · About LEMON Manuals