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.
Input Devices: Notes
The PCM supplies a buffered (reference) voltage to the various information sensors and switches. PCM monitors the input components for circuit continuity and out-of-range values. PCM also provides performance checking. Performance checking refers to the PCM indicating a fault when the signal from an input does not seem reasonable, i.e., a Throttle Position (TP) sensor that indicates a high throttle position at low engine loads or low manifold absolute pressure sensor voltage. The input components may include, but are not limited to the following sensors and switches:
- A/C compressor clutch relay (A/C relay).
- Camshaft Position (CMP) sensor.
- Crankshaft Position (CKP) sensor.
- Engine Coolant Temperature (ECT) sensor.
- Fuel Tank Pressure (FTP) sensor.
- Heated Oxygen Sensor (HO2S).
- Knock Sensor (KS).
- Mass Air Flow (MAF) sensor.
- Power Steering Pressure (PSP) switch, if equipped.
- Transmission Range Switch (A/T only).
- Throttle Position (TP) sensor.
- Vehicle Speed Sensor (VSS).
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.