Circuit/System Testing
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
Fuel Pressure Low
- Verify none of the conditions listed below exist:
- Restricted fuel feed pipe
- Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
- If a condition exists
Repair as necessary.
- Go to next step: If no conditions exist
Go to next step: Replace the G12 Fuel Pump.
Fuel Pressure Leaks Down
- Ignition OFF, relieve the fuel pressure.
- Install the EN 37287 Adapter between the chassis fuel feed hose and the engine compartment fuel feed pipe.
- Open the valve on the EN 37287 Adapter.
- Ignition ON, command the Chassis Control Module Fuel Pump On and then Off with a scan tool.
- Close the valve on the EN 37287 Adapter.
- Verify that the scan tool Chassis Control Module Fuel Pressure Sensor parameter does not decrease more than 34 kPa (5 psi) in 1 min.
- If greater than 34 kPa (5 psi)
Replace the G12 Fuel Pump.
- Go to next step: If less than 34 kPa (5 psi)
Go to next step: Locate and replace the leaking Q17 Fuel Injector.
- If greater than 34 kPa (5 psi)
Fuel Pressure Drops Off
- Verify none of the conditions listed below exist:
- Restricted fuel feed pipe
- Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
- If a condition exists
Repair as necessary.
- Go to next step: If no conditions exist
Go to next step: Replace the G12 Fuel Pump.