DL20 - Remove Garage Forced Ventilation

Diagnostic Trouble Code (DTC) 326 indicates the Pressure Feedback EGR (PFE) circuit voltage is lower than expected at zero EGR Vacuum Regulator (EVR) duty cycle.

Possible cause:

- Obstructed vacuum hose.

- Contaminated EVR filter.

- Damaged EGR valve.

- Damaged EVR solenoid.

- Garage exhaust ventilation system.

NOTE: PFE system can sense a lack of pressure in the vehicle exhaust system. An efficient garage exhaust ventilation system that is installed during Key On Engine Running (KOER) Self-Test may generate a DTC 326.

- Remove garage forced ventilation system and properly vent to atmosphere.

- Rerun KOER Self-Test. Key ON Engine Running (KOER) Self-Test

- Is DTC 326 present?

Yes -- Go to DL21. DL21 - Rerun Self-Test w/EGR Vacuum Line Disconnected

No -- Address other DTCs in KOER Self-Test. Manufacturer Code Charts

If none, continue with remaining Quick Test. Flow of Diagnosis