DTC 4-1-1 Throttle Position Potentiometer Signal

4-1-1 THROTTLE POSITION SENSOR SIGNAL

Preconditions for DTC
^ If the ECM receives a signal from the Throttle Position (TP) Sensor which corresponds to a throttle angle less than 3.3° (0.1 Volts) (signal too low) or higher than 100.1° (4.9 Volts) (signal too high), the ECM interprets this as a fault and DTC 4-1-1 is set.


Substitute values
^ Idle Air Control (IAC) Valve inhibited.
^ Throttle angle set at 32.2°.
^ The ECM uses the Mass Air Flow (MAF) signal to determine idling position.
^ The ECM uses the Mass Air Flow (MAF) signal and RPM to determine full-load position.

Fault sources
^ Signal too high:
- Voltage or signal lead short circuited to voltage supply.
- Break in signal or ground lead.
- Contact resistance in connectors.
- Defective TP sensor.

^ Signal too low:
- Voltage or signal lead short circuited to ground.
- Break in voltage lead.
- Contact resistance in connectors.
- Defective TP sensor.

Fault symptoms
^ Car feels a bit sluggish.
^ High idling speed in neutral.