DDEC III/IV Single ECM Troubleshooting

Section 21.1 Description of Flash Code 21

Section 21.1
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

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