P0123

Wiring Diagram:

CIRCUIT DESCRIPTION
The throttle position sensor is connected to the throttle valve shaft on the throttle body, and detects the throttle valve opening.

The throttle opening is detected by the potentiometer as follows.

A 5-volt reference voltage is applied to the sensor from ECM (PCM) and as its brush moves over the print resistance according to the throttle valve opening, the output voltage varies accordingly.

By monitoring the sensor output voltage, ECM (PCM) detects the throttle valve opening.

ECM (PCM) uses the signal from TP sensor as one of the signals to control fuel injector, idle air control valve, ignition timing, EVAP canister purge valve and EGR valve.

DTC Detecting Condition And Trouble Area:

DTC CONFIRMATION PROCEDURE
1. Connect scan tool to DLC with ignition switch OFF.
2. Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool and run engine at idle speed for 10 sec. or more.
3. Check DTC by using scan tool.

Step 1 - 4:

TROUBLESHOOTING