Circuit/System Testing

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.

Ignition/Vehicle - Off
Disconnect the appropriate electrical connector: Q17 Fuel Injector
Ignition - On / Vehicle - In Service Mode
Test for 4. 5 to 6. 5 V between the test points: Control circuit terminal 1 & Ground
- If not between 4. 5 and 6. 5 V
  Refer to: DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, or P2151
- Go to next step: If between 4. 5 and 6. 5 V
Test for 0. 60 to 0. 80 V between the test points: Control circuit terminal 2 @ Component harness & Ground
- If not between 0. 60 and 0. 80 V
  Refer to: DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, or P2151
- Go to next step: If between 0. 60 and 0. 80 V
Verify a condition does not exist with the component: Q17 Fuel Injector - Refer to: Component Testing
- If a condition exists
  Replace the component: Q17 Fuel Injector
- Go to next step: If no condition exists
Perform a conventional engine compression test. Refer to: Engine Compression Test
- If one or more cylinders indicate low compression
  Repair as necessary
- Go to next step: If all cylinders indicate normal compression
Test or replace the component: Q17 Fuel Injector