P1121

Description
TP SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE

Throttle Position (TP) sensor measures amount of throttle
opening. PCM uses TP sensor information for fuel delivery
calculations. TP sensor readings during acceleration are much higher
than those during deceleration or idle. DTC P1121 sets if PCM senses
TP sensor voltage intermittently greater than 4.7 volts.

Symptoms
You likely won't notice any drivability problems.

Causes

• TP signal voltage is intermittently greater than 4.7 volts.

Solutions

• If DTC P0123 is also set, diagnose DTC P0123 before
  proceeding.
• Check for faulty connections or damaged harness.
• Test TPS
• Replace TPS