Circuit/System Testing

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

Ignition/Vehicle - Off
Disconnect the electrical connector: Q18A Fuel Pressure Regulator 1
Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
Ignition - On/Vehicle - In Service Mode
Perform the scan tool control function: Fuel Pressure Regulator 1 - On and Off
Verify the test lamp turns On and Off.
- If the test lamp does not turn On and Off
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
3. Ignition - On/Vehicle - In Service Mode
4. 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.
  - If less than 1 V
5. Test for less than 2 ohms between the test points:
  - Control circuit terminal 1 @ Component harness & Terminal 21 @ Control module harness
  - Control circuit terminal 2 @ Component harness & Terminal 36 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K20 Engine Control Module
- Go to next step: If the test lamp turns On and Off
Replace the component: Q18A Fuel Pressure Regulator 1