Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON.
Verify DTC U0074 or U18A2 is not set or stored in history.
- If DTC U0074 or U18A2 is set or stored in history
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If DTC U0074 or U18A2 is not set or stored in history
Engine running.
Verify the scan tool Fuel Pressure Sensor parameter is between 0.2 - 4.8 V.
- If not between 0.2 - 4.8 V
  Refer to Circuit/System Testing.
- Go to next step: If between 0.2 - 4.8 V
Verify the scan tool Fuel Pressure Sensor increases or decreases when commanding an increase and decrease in Fuel Pressure with a scan tool.
- If the pressure does not change
  Refer to Circuit/System Testing.
- Go to next step: If the pressure changes
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  Refer to Circuit/System Testing.
- Go to next step: If the DTC does not set
All OK.