Question about 2003 Ford Windstar
DTC code is P1120. How can this be corrected? Thank you.
-- Frayed wires.
The code is faulty throttle position sensor. but here is some other reasons to get that code
-- Corrosion on TP sensor, PCM or harness connectors.
-- VREF harness opens or shorts.
-- Damaged TP sensor.
-- Damaged PCM.
God Bless Greg
Posted on Nov 25, 2008
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Posted on Jan 02, 2017
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Nov 01, 2011 | 2003 Ford Windstar
Diagnostic Trouble Code (DTC) P1120 indicates that the Throttle Position Sensor (TPS) closed throttle position is below the range of 3.4 percent (0.17 volts). Possible causes for this DTC are:
· Damaged wiring harness or connectors
· Open or shorted Reference Voltage (VREF) circuit
· Faulty TPS
· Faulty Powertrain Control Module (PCM)
The methods/steps for diagnosing this code depend on how the code was stored and retrieved.
This code can be a Key On Engine Off (KOEO), Key On Engine Running (KOER), or a Continuous Memory code. To properly diagnose the cause of the problem a scanner must be obtained that has the ability to read each of these as well as the capability of reading live engine data from the PCM.
Direct voltage readings should be taken at the TPS connector and compared to the live data at the PCM. This will eliminate the possibility of a faulty PCM. The VREF and Signal Return circuits must be verified between the TPS and the PCM. Also the Sensor Ground circuit must be verified between the TPS connector and battery ground.
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