Circuit/System Testing

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.

P145C Pump Stuck Off

Vehicle in Service Mode.
Verify the scan tool EVAP Leak Detection Pump Pressure parameter, record the value.
Command the EVAP Leak Detection Pump ON with a scan tool for 10 s, record reading.
The EVAP Leak Detection Pump Pressure should decrease greater than 1.5 kPa (0.21 PSI) from step 2.
- If 1.5 kpa or less
  Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly
- Go to next step: If within specified range
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
  Repeat step 2
- Go to next step: If the DTC does not set
All OK

P145D Pump Stuck On

Vehicle in Service Mode.
Verify the scan tool EVAP Leak Detection Pump Pressure parameter, record the value.
Command the EVAP Leak Detection Pump Switching Valve Command to Not Venting/ON position with a scan tool for 10 s, record reading.
The EVAP Leak Detection Pump Pressure should not change from step 2 (within 0.2 kPa / 0.029 PSI).
- If 0.2 kpa or greater
  Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly
- Go to next step: If within specified range
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
  Repeat step 2
- Go to next step: If the DTC does not set
All OK