Throttle Position (TP) Sensor
DESCRIPTIONThe throttle position sensor (TP sensor) is a potentiometer that is mounted on the throttle body. The throttle position sensor detects the position of the throttle plate or lever and sends this information as a voltage signal to the powertrain control module (PCM). If the throttle position sensor or related circuits fail to operate in a normal manner, the powertrain control module will recognize that the throttle position sensor signal is out of specification. The powertrain control module will then operate the E4OD transmission at a higher line pressure to prevent transmission damage. This high line pressure causes harsh upshift and engagements. Used as an input to determine shift scheduling and electronic pressure control.
SYMPTOMS
Harsh engagements, firm shift feel, abnormal shift schedule, abnormal or no torque converter clutch operation. May flash transmission control indicator lamp.
DIAGNOSTIC TROUBLE CODES
P0122, P0123, P1120, P1124