Ford
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Throttle Position Sensor 'B Circuit Low Conditions
Cause:
    Key on, or engine running, then the PCM detected that the TP-B sensor signal was less than 0.2v during the self-test

Generic
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Throttle/Pedal Position Sensor/Switch "B" Circuit Low

GM
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Accelerator Pedal Position Sensor 2 Low Input Conditions
Cause:
    Key on or engine running, then the PCM detected that the APP-2 sensor voltage was less than 250 mv, condition met for 2 seconds

Nissan
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Throttle position (TP) sensor 1 - voltage low
Cause:
    Wiring, TP sensor, ECM