Description of Flash Code 21
Flash Code 21 indicates that the Throttle Position Sensor (TPS), see Figure "Throttle Position Sensor " , input to the ECM has exceeded 95% (normally >4.75 volts) of the sensor supply voltage.
This diagnostic condition is typically:
- Open sensor return circuit
- Sensor signal circuit is shorted to the sensor +5 volt supply
|DDEC III/IV Single ECM Troubleshooting Guide - 6SE497|
|Generated on 10-13-2008|