* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
EN-46999 Displacement On Demand Tester
For equivalent regional tools, refer to Special Tools (See: Powertrain Management/Computers and Control Systems/Tools and Equipment).
Circuit/System Verification
Note: DTC P3401, P3425, P3441, and P3449 sets with an open ignition circuit fuse.
1. Ignition ON, command the appropriate cylinder deactivation solenoid ON and OFF while observing the following status parameters with a
scan tool:
* Cyl. 1, 4, 6, or 7 Deact. Sol. Ckt Open Test Status
* Cyl. 1, 4, 6, or 7 Deact. Sol. Ckt Short Gnd Test Status
* Cyl. 1, 4, 6, or 7 Deact. Sol. Ckt Short Volts Test Status
Each parameter should display OK or Not Run
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, remove the intake manifold. Refer to Intake Manifold Replacement (Without AFM) (See: Engine, Cooling and
Exhaust/Engine/Intake Manifold/Service and Repair)Intake Manifold Replacement (With AFM) (See: Engine, Cooling and
Exhaust/Engine/Intake Manifold/Service and Repair).
2. Disconnect the harness connector at the valve lifter oil manifold assembly.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E and ground.
锟斤拷If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and
the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
4. Verify that a test lamp does not illuminate between the ignition circuit terminal E and the appropriate cylinder deactivation solenoid control
circuit terminal listed below.
* Cylinder deactivation solenoid valve 1 terminal C
* Cylinder deactivation solenoid valve 2 terminal A
* Cylinder deactivation solenoid valve 3 terminal B
* Cylinder deactivation solenoid valve 4 terminal D
锟斤拷If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
5. Remove the test lamp.
6. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve
Control Circuit High Voltage Test Status parameter displays OK.
锟斤拷If not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the
ECM.
* Cylinder deactivation solenoid valve 1 terminal C
* Cylinder deactivation solenoid valve 2 terminal A
* Cylinder deactivation solenoid valve 3 terminal B
* Cylinder deactivation solenoid valve 4 terminal D
7. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and the ignition circuit terminal E. Command the
appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit
High Voltage Test Status parameter displays Malfunction.
* Cylinder deactivation solenoid valve 1 terminal C
* Cylinder deactivation solenoid valve 2 terminal A
