Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

NOTE: Additional DTCs will set when disconnecting the components.

Vehicle OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids .
Vehicle in Service Mode.
Test for 4.8 - 5.2 V between one of the 5 V reference circuits and ground.
- If less than 4.8 V
1. Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.
2. Test for infinite resistance between the 5 V reference circuit for each applicable component and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K20 Engine Control Module.
- If greater than 5.2 V
1. Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.
2. Test for less than 1 V between the 5 V reference circuit for each applicable component and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K20 Engine Control Module.
- If between 4.8 - 5.2 V
Vehicle in Service Mode.
NOTE: A short to voltage or ground on the signal circuit of certain components may cause this DTC to set.
Verify the appropriate scan tool 5 V Reference 1, 2, 3 or 4 Circuit Status parameter displays OK while connecting each component associated with the 5 V reference circuit one at a time.
- If OK is not displayed when a component is connected
  Test the signal circuit of that component for a short to ground or voltage. If the circuit tests normal, replace the component.
- If OK is displayed after all components have been connected
All OK.