DTC P0123: Throttle Position (TP) Sensor Circuit High Input: Procedure
- Turn ignition off. Disconnect TP sensor 3-pin connector. Turn ignition on. Measure voltage between ground and TP sensor harness connector terminal No. 3 (Blue/Orange wire). See Figure . If voltage is 5.6-5.8 volts, go to next step. If voltage is more than 5.8 volts, repair short to power in Blue/Orange wire between TP sensor and ECM. If voltage is less than 5.6 volts, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair as necessary appropriate connector. If problem does not exist, repair open in Blue/Orange wire between TP sensor and ECM.
- Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between TP sensor harness connector terminal No. 1 and ECM harness connector terminal No. 71. See Figure and Figure . If resistance is less than ohm, go to next step. If resistance is one ohm or more, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair as necessary appropriate connector. If problem does not exist, repair open in Black/Green wire between TP sensor and ECM.
- Turn ignition off. Measure resistance between TP sensor harness connector terminals No. 2 and 3 (Blue/White wire and Blue/Orange wire - component side). Resistance should be 1.6-2.4 k/ohms with throttle closed. As throttle is opened, resistance should smoothly increase linearly to over 4 k/ohms at wide open throttle. If resistances are not as specified, replace TP sensor. If resistances are as specified, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair as necessary appropriate connector.