Circuit/System Testing
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition/Vehicle - Off
- Disconnect the electrical connector: G18 High Pressure Fuel Pump
- Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
- Engine - Idling - At normal operating temperature
- Increase the engine speed slowly to 3500 RPM and then back to idle.
- Verify the test lamp turns On and changes intensity.
- If the test lamp is always Off
- Ignition/Vehicle - Off & Remove - Test lamp
- Disconnect the electrical connector: X3 @ K20 Engine Control Module
- Ignition - On/Vehicle - In Service Mode
- Test for less than 1 V between the test points:
- Control circuit terminal 1 @ Component harness & Ground
- Control circuit terminal 2 @ Component harness & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition/Vehicle - Off
- Test for infinite resistance between the test points:
- Control circuit terminal 1 @ Component harness & Ground
- Control circuit terminal 2 @ Component harness & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 2 ohms between the test points:
- Control circuit terminal 1 @ Component harness & Terminal 72 @ Control module harness
- Control circuit terminal 2 @ Component harness & Terminal 52 @ Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
- Test for greater than 1 ohms between the test points:Control circuit terminal 1 & Control circuit terminal 2
- If 1 ohms or less - Repair the short between the circuits.
- If 1 ohms or greater - Replace the component:K20 Engine Control Module
- Go to next step: If the test lamp turns On and changes intensity
- Test or replace the component: G18 High Pressure Fuel Pump