Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Ignition/Vehicle - Off
- Verify the following conditions do not exist:
- Q17 Fuel Injector - Leaking/Restricted
- Direct Fuel Injection Fuel Rail - Leaking/Restricted
Refer to: Fuel Leak Diagnosis
- Fuel - Contaminated/Poor Quality
Refer to: Contaminants-in-Fuel Diagnosis
- Fuel Feed Pipe - Leaking/Restricted
Refer to: Fuel Leak Diagnosis
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no condition exists
- Perform the scan tool control function: Fuel Pressure Control - Regulator 1 - Increase & Decrease
Verify the scan tool parameter: Fuel Rail Pressure Sensor 1 = The value should change with each command.
- If the value does not change
Replace the component: Q18A Fuel Pressure Regulator 1
- Go to next step: If the value changes
- If the value does not change
- Perform the scan tool control function: Fuel Pressure Control - Regulator 2 - Increase & Decrease
Verify the scan tool parameter: Fuel Rail Pressure Sensor 1 = The value should change with each command.
- If the value does not change
Replace the component: Q18B Fuel Pressure Regulator 2
- Go to next step: If the value changes
- If the value does not change
- All OK.