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: X160 or X161
- Ignition - On / Vehicle - In Service Mode
- Verify the scan tool parameter:
X160
- Cylinder 1 Injector Control Circuit Status = OK
- Cylinder 3 Injector Control Circuit Status = OK
- Cylinder 5 Injector Control Circuit Status = OK
X161
- Cylinder 2 Injector Control Circuit Status = OK
- Cylinder 4 Injector Control Circuit Status = OK
- Cylinder 6 Injector Control Circuit Status = OK
- If not the specified state
- Ignition/Vehicle - Off
- Disconnect the electrical connector: X3 @ K20 Engine Control Module
- Test for infinite resistance between the test points:
- { Q17A Fuel Injector 1 } Terminal 72 & Terminal 52 @ Control module harness
- { Q17B Fuel Injector 2 } Terminal 71 & Terminal 51 @ Control module harness
- { Q17C Fuel Injector 3 } Terminal 67 & Terminal 47 @ Control module harness
- { Q17D Fuel Injector 4 } Terminal 66 & Terminal 46 @ Control module harness
- { Q17E Fuel Injector 5 } Terminal 70 & Terminal 50 @ Control module harness
- { Q17F Fuel Injector 6 } Terminal 68 & Terminal 48 @ Control module harness
- If less than infinite resistance - Repair the short between the circuits.
- If infinite resistance - Replace the component: K20 Engine Control Module
- Go to next step: If the specified state
- Ignition/Vehicle - Off
- Disconnect the appropriate electrical connector: Q17 Fuel Injector
- Test for infinite resistance between the test points: Q17 Fuel Injector Terminal 1 & Terminal 2 @ Component harness
- If less than infinite resistance
Repair the short between the circuits: High Control & Low Control
- If infinite resistance
Test or replace the component: Q17 Fuel Injector
- If less than infinite resistance