Fault Code 24
Description: Throttle position
sensor (TPS) signal is out of range
Power loss light: On
MAP sensor is
used as an indication of thottle position
TPS failure - The TPS is located on the throttle body on the opposite
side of the throttle cable. Turn the engine off, disconnect the sensor
and test it by connecting an ohmmeter (preferably an analog one) between
the center and either outside pin of the sensor. Slowly open the
throttle all the way and then slowly close it again. The ohmmeter
should show a constant, smooth change in resistance as the throttle is
moved. If there are any jumps in reading or no change in reading
at all, replace the sensor. If the sensor seems ok, reconnect the
sensor cable and turn the ignition on. One outside wire should be
5V, the other ground. The voltage on the center wire should vary
as the throttle is opened (about 0V closed, 3V wide open). If power
or ground is not present, check the wiring.
Bad connection or wiring - Check the wiring and connections between
the sensor and the logic module (or SMEC). Clean and regrease any
corroded connectors with dielectric grease. Check connections if
there is no power or ground, or for shorts if there is power and resistance,
but no output.
- Sensor output less than 0.16V or greater than 4.7V
Results If Component Fails
Fault code 24 is stored, the power loss light is turned on, and the logic
module will enter limp-in mode. The logic module will then use the
MAP sensor as an indication of the thottle position. A MAP sensor
voltage less than 2.0V is considered closed throttle and a MAP sensor voltage
greater than 2.0V is considered wide open throttle (WOT).
This page is maintained by Russell W. Knize and was last updated 08/28/98.
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Copyright © 1996-2003 Russ W. Knize