DDEC III/IV Single ECM Troubleshooting – Section 34.1 Description of Flash Code 34

Section 34.1
Description of Flash Code 34

Flash Code 34 indicates that the engine Turbo Boost Sensor (TBS), see Figure "Turbo Boost Sensor" and see Figure "Turbo Boost Sensor — 2003 Engines" , input to the ECM has dropped below 5% (normally < 0.25 volts) of the sensor supply voltage. ‪

This diagnostic condition is typically:‪

• Open sensor signal circuit
• Open sensor +5 volt supply circuit
• Sensor signal is shorted to sensor return circuit or to ground
• Sensor +5 volt supply is shorted to the sensor return circuit or ground
• Plugged or restricted air filter.