Circuit/System Testing

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

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: Q43 Valve Lifter Oil Manifold Assembly
Ignition - On/Vehicle - In Service Mode
Verify a test lamp turns On between the test points: Ignition circuit terminal 4 & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for less than 2 ohms between the test points: Ignition circuit terminal 4 & Output terminal@Fuse
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
- If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Connect the electrical connector: Q43 Valve Lifter Oil Manifold Assembly
3. Ignition - On/Vehicle - In Service Mode
4. Replace the component: Fuse
5. Verify the fuse does not open.
  - If the fuse opens and there are components connected to the circuit - Disconnect a component and repeat procedure starting at step 4.4
  - If the fuse opens with all components disconnected from the circuit - Repair the short to ground on the circuit.
  - If the fuse does not open after disconnecting a component from the circuit - Replace the component disconnected last.
  - Go to next step: If the fuse does not open with all components connected.
6. Operate the component: Each component on the circuit - One at a time - Exceptions listed below
  - Q43 Valve Lifter Oil Manifold Assembly
    Verify the fuse does not open when any of the components are activated.
  - If the fuse opens - Replace the component that caused the fuse to open when activated.
  - Go to next step: If the fuse does not open.
7. Refer to: Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing
- Go to next step: If the test lamp turns On
Verify the scan tool parameter: Cylinder 1, 4, 6, 7 Deactivation Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or OK
- If not the specified state
1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K20 Engine Control Module
3. Test for infinite resistance between the test points:
  - Control circuit terminal 1@Component harness & Ground
  - Control circuit terminal 2@Component harness & Ground
  - Control circuit terminal 3@Component harness & Ground
  - Control circuit terminal 5@Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Replace the component: K20 Engine Control Module
- Go to next step: If the specified state
Connect a 3 A fused jumper wire between the test points:
- Control circuit terminal 1@Component harness & Ground
- Control circuit terminal 2@Component harness & Ground
- Control circuit terminal 3@Component harness & Ground
- Control circuit terminal 5@Component harness & Ground
  Verify the scan tool parameter: Cylinder 1, 4, 6, 7 Deactivation Solenoid Valve Control Circuit Low Voltage Test Status = Malfunction
- If not the specified state & Fuse@Jumper = OK
1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K20 Engine Control Module
3. Test for less than 2 ohms between the test points:
  - Control circuit terminal 1@Component harness & The other end of the circuit
  - Control circuit terminal 2@Component harness & The other end of the circuit
  - Control circuit terminal 3@Component harness & The other end of the circuit
  - Control circuit terminal 5@Component harness & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - Go to next step: If less than 2 ohms - Replace the component: K20 Engine Control Module
- If not the specified state & Fuse@Jumper = Open
  Repair the short to voltage on the circuit.
- Go to next step: If the specified state & Fuse@Jumper = OK
Test or replace the component: Q43 Valve Lifter Oil Manifold Assembly