P0123

Diagnostic Chart:

Schematic:

The Throttle Position (TP) sensor is mounted on the throttle body assembly. The sensor is comprised of two potentiometers with common supply and ground circuits, and independent signal circuits. As the throttle opens, the signal wire on sensor 1 reads a higher voltage, and the voltage on signal wire for sensor 2 decreases. The ECM sets this DTC when the signal being received is higher than expected.

DTC PARAMETERS
This DTC will set when:
^ TPS 1 voltage greater than 0.13 volts
^ Above condition met for longer than 140 ms

DTC P0123 is a (type A) DTC

DIAGNOSTIC AIDS
To locate an intermittent problem use Scan tool to monitor TP sensor 1 voltage with engine running.

Wiggling wires while monitoring TP sensor 1 voltage may locate area where a short to voltage exists.

Possible causes:
^ Poor connections
Check for adequate terminal tension.
^ Corrosion
^ Rubbed through wire insulation
^ Broken wire inside the insulation
^ Water intrusion into connectors