Throttle/Pedal Position Sensor/Switch "E" Circuit Low
Throttle Position Sensor (TPS) circuit has a low input voltage, indicating a connection or sensor problem. This affects engine idle, acceleration, and transmission shifting.
What You Might Notice
- Rough or low idle
- Engine stalling
- Surging or hesitation
- Poor acceleration
- Check Engine light
Most Common Causes
- 1
Faulty TPS
The throttle position sensor has failed or is sending incorrect voltage signals.
- 2
Loose TPS mounting
The sensor is not properly secured, causing intermittent or weak signals.
- 3
Wiring short to ground
The TPS circuit wiring is shorted to ground or another wire, reducing signal voltage.
- 4
Faulty PCM
The engine control computer has failed and cannot properly read the TPS signal.
How to Diagnose It
- 1
Check Faulty TPS — The throttle position sensor has failed or is sending incorrect voltage signals.
- 2
Check Loose TPS mounting — The sensor is not properly secured, causing intermittent or weak signals.
- 3
Check Wiring short to ground — The TPS circuit wiring is shorted to ground or another wire, reducing signal voltage.
- 4
Check Faulty PCM — The engine control computer has failed and cannot properly read the TPS signal.
How to Fix It
- 1
Replace TPS
Remove and install a new throttle position sensor calibrated for your vehicle.
- 2
Inspect and secure TPS
Check mounting bolts and bracket for looseness and tighten to proper specification.
- 3
Repair TPS wiring
Inspect wiring harness for cuts, corrosion, or shorts and repair or replace as needed.
- 4
Test or replace PCM
Have the engine control module tested; replace if faulty after ruling out sensor issues.
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