Neon L4-2.0L SOHC (1995)
Throttle Position Sensor: Description and Operation
Related Trouble Codes & Set Conditions
No 5 Volts to TP Sensor
NAME OF CODE:
No 5 Volts to TP Sensor
WHEN MONITORED:
Vehicle speed above 20 mph, MAP sensor vacuum above 3 in., and engine speed above 1500 rpm.
SET CONDITION:
TP sensor signal goes below 0.5 volts.
THEORY OF OPERATION:
The throttle position sensor contains a potentiometer that is operated by the throttle blade shaft. As the throttle plate rotates, the TP sensor
provides a variable 0 to 5 volt signal to PCM cavity 10. The voltage is directly proportional to throttle angle. When the throttle is fully open, the
voltage is high. With this signal, the PCM can determine precise throttle position ;under all operating conditions.
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The TP sensor receives a 5 volt supply from PCM cavity 61.
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The sensor ground is provided by PCM cavity 43.
POSSIBLE CAUSES:
-
Open 5 volt supply
-
TP sensor failure
Throttle Position Sensor Operation
THROTTLE POSITION SENSOR
From the Powertrain Control Module (PCM), circuit K6 supplies 5 volts to the Throttle Position Sensor (TPS). Circuit K6 connects to cavity 43
of the PCM, and cavity 1 of the sensor connector.
When the operator puts the vehicle in reverse, the back-up lamp switch connects circuits F20 and L1. Circuit F20 is connected to a bus bar in fuse
block, and cavity 3 of the PARK/NEUTRAL position switch. Circuit A22 feeds the bus bar.
Circuit L1 feeds the back-up lamps and double-crimps to provide an input to the PCM on cavity 55. Circuit L1 connects to cavity 1 of the
PARK/NEUTRAL position switch.
Throttle Position Sensor Voltage High
NAME OF CODE:
Throttle Position Sensor Voltage High
WHEN MONITORED:
With the ignition ON.
SET CONDITION:
Throttle Position (TP) sensor voltage at Powertrain Control Module (PCM) cavity 10 goes above 4.5 volts for 0.704 seconds.
THEORY OF OPERATION:
The throttle position sensor contains a potentiometer that is operated by the throttle blade shaft. As the throttle plate rotates, the TP sensor
provides a variable 0 to 5-volt signal to PCM cavity 10. The voltage is directly proportional to throttle angle. When the throttle plate is at rest, the
voltage is low. When the throttle is fully open, the voltage is high. With this signal, the PCM can determine precise throttle position under all
operating conditions. The TP sensor receives a 5-volt supply from PCM cavity 43. The sensor ground is provided by PCM cavity 51.
POSSIBLE CAUSES:
-
Sensor signal circuit open
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Throttle position sensor failure
-
Sensor ground circuit open
Throttle Position Sensor Voltage Low
NAME OF CODE:
Throttle Position Sensor Voltage Low
WHEN MONITORED:
With the ignition ON.
