For 1990-2009 cars only
Circuit Description
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 conflicts with the MAF reading.
DTC Parameters
DTC P0122 will set when:
| • | TP sensor 1 voltage less than 0.2 volts |
| • | Above condition met for longer than 140 ms |
P0122 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 short to ground exists.
Possible causes:
| • | Poor connections |
| • | Check for adequate terminal tension |
| • | Corrosion |
| • | Rubbed through wire insulation |
| • | Water intrusion into connectors |
