Fuel Pressure Regulator Graphing
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Set up the scan tool in the following format:
- Select the Data Display on the scan tool.
- Select Engine Data 1.
- Select the More softkey 2 times.
- Select the Live Plot softkey.
- Select the Engine Speed, Actual Fuel Rail Pressure, and Desired Fuel Rail Pressure parameters by highlighting each parameter and depressing the ENTER softkey.
- Select the Accept softkey.
- Select the More softkey, then select the Change Min/Max softkey.
- Select the More softkey, and adjust the parameters to the following Min/Max ranges:
- The Engine Speed Min/Max range is 0 to 1000 RPM.
- The Actual Fuel Rail Pressure Min/Max range is 1.0 to 160 MPa.
- The Desired Fuel Rail Pressure Min/Max range is 1.0 to 160 MPa.
- Start and idle the engine.
- Observe the live plot for sharp changes in the Actual Fuel Rail Pressure above and below the Desired fuel rail pressure while performing one of the following actions:
- Idling the engine.
- Shifting the transmission from Park to Drive, and back to Park.
- Turning the steering wheel from lock to lock.
- Turning the air conditioning ON and OFF.
Callout Component Name 1 Engine Speed 2 Actual Fuel Rail Pressure 3 Desired Fuel Rail Pressure Callout Component Name 1 Engine Speed 2 Actual Fuel Rail Pressure 3 Desired Fuel Rail Pressure Callout Component Name 1 Engine Speed 2 Actual Fuel Rail Pressure 3 Desired Fuel Rail Pressure - If there is a violent fluctuation in the Actual Fuel Rail pressure, as seen in the third Graphic above, replace the fuel pressure regulator. Refer to Fuel Pressure Regulator Replacement .