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Old 09-24-2009, 04:15 PM   #1
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Default P0121

P0121

Description
TP SENSOR SYSTEM PERFORMANCE

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.

Symptoms
  • SES, Service Engine Soon light
  • Intermittent stumble on acceleration or deceleration
  • Blows black smoke on acceleration
  • No start
Causes
  • Defective TPS
  • Short in the TPS wiring.
  • Bad connection at the TPS
  • Water or corrosion in connector or sensor
Possible Solutions
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obd2, obdii, p0121, p121

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