Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Throttle Position Sensor: Description and Operation
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Description and Operation
Throttle Position Sensor:
Throttle Position Sensor (TPS):
PURPOSE
As the throttle angle changes (pressing down on accelerator pedal) so does the Throttle Position (TP) sensor voltage output. By monitoring TP voltage output, the computer can determine fuel delivery rate based on throttle valve angle or driver demand.
OPERATION
The TP sensor is a potentiometer with one connection to the computer 5.0 volt reference and the other to ground. A third wire from the computer is used to measure the output voltage from the TP sensor.
DIAGNOSTIC NOTES
The Engine Control Module (ECM) uses the reading at idle for a zero reading, so no adjustment is necessary. A problem with the TP circuit will cause a Diagnostic Trouble Code (DTC) 21 to be set. Once a DTC code is set, the ECM will substitute a default value for the TP sensor reading and some driveablity will return.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.