Engine-Codes - Ford - P1120 1997 FORD F150

P1120 1997 FORD F150 - Throttle Position Sensor Out of Range

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1120 1997 FORD F150 Possible Causes

  • Faulty throttle position sensor
  • Throttle position sensor harness is open or shorted
  • Throttle position sensor circuit poor electrical connection
  • Throttle position sensor not properly adjusted

How is the P1120 1997 FORD F150 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

The TP sensor circuit is monitored by the PCM for a low TP rotation angle (or voltage) input below the closed throttle position through the comprehensive component monitor (CCM). If during key ON engine OFF or key ON engine running the TP rotation angle (or voltage) remains within the calibrated self-test range but falls between 3.42 and 9.85% (0.17 and 0.49 volt), the test fails.

What is the cost to diagnose the P1120 1997 FORD F150 code

Labor: 1.0

The cost to diagnose the P1120 1997 FORD F150 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

Malfunction is detected when voltage from the sensor is sent to Engine Control Module (ECM) is out of range.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • No throttle response

P1120 1997 FORD F150 Meaning

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. The TPS is a rotary potentiometer sensor that provides a signal to the Powertrain Control Module (PCM) that is linearly proportional to the throttle plate/shaft position. As the TPS is rotated by the throttle shaft, the following operating conditions are determined by the PCM:
• Closed throttle (includes idle or deceleration)
• Part throttle (includes cruise or moderate acceleration)
• Wide open throttle (includes maximum acceleration or de-choke on crank)
• Throttle angle rate

More Information

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