Circuit/System Testing

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

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: X350 Inline Harness Connector

NOTE:

Testing for steps 3 to 7 is performed on the control module K111 side of the harness connector.

Verify a test lamp turns On between the test points: Low Reference circuit terminal G & B+
- If the test lamp does not turn On
1. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
2. Test for less than 2 ohms between the test points: Low Reference circuit terminal G @ X350 Inline Harness Connector & The other end of the circuit @ K111 Fuel Pump Driver Control Module
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K111 Fuel Pump Driver Control Module
- Go to next step: If the test lamp turns On
Connect a test lamp between the test points: Control circuit terminal A & Low Reference circuit terminal G
Ignition - On / Vehicle - In Service Mode
Perform the scan tool control function: Fuel Pump - On and Off
Verify the test lamp turns On and Off.
- If the test lamp is always Off
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
3. Test for infinite resistance between the test points: Control circuit terminal A @ X350 Inline Harness Connector & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Test for less than 2 ohms between the test points: Control circuit terminal A @ X350 Inline Harness Connector & The other end of the circuit @ K111 Fuel Pump Driver Control Module
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K111 Fuel Pump Driver Control Module
- If the test lamp is always On
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Control circuit terminal A @ X350 Inline Harness Connector & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component: K111 Fuel Pump Driver Control Module
- Go to next step: If the test lamp turns On and Off
Disconnect the electrical connector: A7 Fuel Pump and Level Sensor Assembly

NOTE:

Testing for steps 8 to 10 is performed on the component side of the harness connector.

Test for infinite resistance between the test points:
- Control circuit terminal A @ X350 Inline Harness Connector & Ground
- Control circuit terminal G @ X350 Inline Harness Connector & 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 A @ X350 Inline Harness Connector & Control circuit terminal 3 @ A7 Fuel Pump and Level Sensor Assembly
- Control circuit terminal G @ X350 Inline Harness Connector & Control circuit terminal 4 @ A7 Fuel Pump and Level Sensor Assembly
- If 2 ohms or greater
  Repair the open/high resistance in the circuit:
- Go to next step: If less than 2 ohms
Test or replace the component: G12 Fuel Pump