Check the TPS (Throttle position sensor) wire lead and replace the TPS if any signs of damage or failure.
The Throttle Position
Sensor (TPS) is used to send input signals to the Powertrain Control
Module (PCM) to indicate the current angle of the throttle blade.
Theory/Operation:
This sensor is a variable resistor that has a 5 volt reference signal
applied to it by the PCM. The TPS sends signals back to the PCM in the
range of approximately 1 to 4 volts, depending upon the throttle shaft
angle. The PCM uses these input voltages to determine the current
position of the throttle.
The
PCM uses the voltage signals from the TPS and other input sensors to
determine the proper air/fuel mixture and ignition timing for certain
operating conditions. Some of these operating conditions are:
acceleration, deceleration, idle, and wide open throttle.
Typical Readings:
An input voltage of approximately 1 volt indicates a minimum throttle
opening, idle, or deceleration condition. An input voltage of
approximately 2 volts indicates a cruise or light acceleration
condition. An input voltage of approximately 4 volts would indicate a
maximum throttle opening or wide open throttle condition.
NOTE: The following procedure tests the TPS only.
- The TPS can be tested with an analog voltmeter. The center terminal of the TPS is the output terminal.
- With the ignition key in the ON position, check the TPS output
voltage at the center terminal wire of the connector. Check this at
idle (throttle plate closed), and at wide open throttle (WOT).
- At idle, TPS output voltage should be approximately one volt. The
output voltage should increase gradually as the throttle plate is
slowly opened from idle to WOT.
- At wide open throttle, TPS output should be approximately 4.5 volts.
As always, check the service manual for the proper procedures and specifications for your particular vehicle.
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