Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This diagnostic assumes the following:

Verify the battery is completely charged. Refer to Battery Inspection/Test .
Verify the engine cranking speed should be at least 100 RPM cold and 180 RPM hot. Refer to Engine Cranks Slowly .
Verify there is adequate fuel in the fuel tank.

Engine cranking for 15 s, verify the DTC information with a scan tool. Verify that no DTC is set.
- If any DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no DTC is set
Visually inspect the fuel system from the high pressure pump to the fuel tank for leaks.
- If a fuel leak is present
  Refer to Fuel System Diagnosis .
- Go to next step: If no fuel leaks are present
Engine cranking for 15 s, observe the scan tool Fuel Rail Pressure Sensor parameter. The reading should be greater than 13 MPa (1885 PSI)
- If the Fuel Rail Pressure Sensor parameter is less than 13 MPa (1885 PSI)
  Refer to Fuel System Diagnosis
- Go to next step: If the Fuel Rail Pressure Sensor parameter is 13 MPa (1885 PSI) or greater
Verify the following conditions do not exist:
- Collapsed air intake duct to the throttle body
- Restricted air filter element
- A skewed engine coolant temperature (ECT) sensor. Verify sensor resistance against the Temperature Versus Resistance - Engine Coolant Temperature Sensor tables.
- Exhaust system restricted. Refer to Restricted Exhaust .
- Fuel contamination. Refer to Contaminants-in-Fuel Diagnosis .
- Engine mechanical condition, for example, worn timing belt or low compression. Refer to Symptoms - Engine Controls , or Engine Compression Test .
- If any of the above listed conditions are exists
  Repair as necessary.
- Go to next step: If no of the above listed conditions is exists
All OK.