Circuit/System Testing

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

Ignition/Vehicle - Off
Verify the condition does not exist: Fuel System - Leaking
Refer to: Fuel Leak Diagnosis
- If the condition exists
  Repair or replace as necessary
- Go to next step: If no condition exists
Engine - Idling
Verify the scan tool parameter: Fuel Pressure Sensor = 370 to 450 kPa (54 to 65 PSI)
- If less than 370 kPa (54 PSI)
  Refer to: Fuel System Diagnosis
- If greater than 450 kPa (65 PSI)
  Refer to: Fuel Return System Diagnosis
- Go to next step: If between 370 and 450 kPa (54 and 65 PSI)
Perform the following procedure/test: Cylinder Power Balance Test
Verify the procedure/test passes.
- If the procedure/test does not pass
  Replace the component that failed the test: Q17 Fuel Injector
- Go to next step: If the procedure/test passes

NOTE:

Scan Tool Control Function - Fuel Pressure Regulator - Controls the following components:

Perform the scan tool control function: Fuel Pressure Regulator - Increase & Decrease
Verify the scan tool parameter: Fuel Rail Pressure Sensor = The value should change with each command.
- If the value does not change
  Replace the component: Q18A Fuel Pressure Regulator 1 & Q18C Fuel Pressure Regulator 3
- Go to next step: If the value changes
Perform the scan tool control function: Fuel Pressure Control - Regulator 2 - Increase & Decrease
Verify the scan tool parameter: Fuel Rail Pressure Sensor = 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

NOTE:

Fuel Rail Pressure - Maximum @ At Idle Speed = 110 MPa (15, 954 PSI)