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P3401




DTC P3401, P3425, P3441, or P3449

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC P3401
- Cylinder 1 Deactivation Solenoid Control Circuit

DTC P3425
- Cylinder 4 Deactivation Solenoid Control Circuit

DTC P3441
- Cylinder 6 Deactivation Solenoid Control Circuit

DTC P3449
- Cylinder 7 Deactivation Solenoid Control Circuit

Diagnostic Fault Information





Typical Scan Tool Data









Circuit/System Description

The cylinder deactivation system is used to deactivate 4 cylinders of the engine under light load driving conditions. The engine control module (ECM) commands the cylinder deactivation solenoids ON to deactivate engine cylinders 1, 7, 6, and 4, switching to 4 cylinders or V4 mode. The cylinder deactivation solenoids controls the oil flow to the appropriate valve lifters. The engine operates on 8 cylinders or V8 mode, during engine starting, engine idling, and medium to heavy throttle conditions.

Ignition voltage is supplied directly to the 4 cylinder deactivation solenoids. The engine control module (ECM) controls the 4 cylinder deactivation solenoids by grounding the control circuit with a solid state device called a driver.

Conditions for Running the DTC

* The engine speed is greater than 400 RPM.
* The ignition voltage is between 11-18 V.
* DTCs P3401, P3425, P3441, and P3449 run continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

* DTC P3401, P3425, P3441, and P3449 are Type B DTCs.
* The engine will return to V8 mode.
* The ECM disables the fuel injector for the cylinder that set a cylinder deactivation DTC, resulting in an engine misfire.

Conditions for Clearing the DTC

DTC P3401, P3425, P3441, and P3449 are Type B DTCs.

Diagnostic Aids

The valve lifter oil manifold solenoids are assigned to the following engine cylinders:

* Solenoid #1 = Cylinder #1
* Solenoid #2 = Cylinder #4
* Solenoid #3 = Cylinder #6
* Solenoid #4 = Cylinder #7

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Cylinder Deactivation (Active Fuel Management) System Description (Cylinder Deactivation (Active Fuel Management) System)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

EN-46999 Displacement On Demand Tester

For equivalent regional tools, refer to Special Tools (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:

* Cylinder 1, 4, 6, or 7 Deactivation Solenoid Valve Control Circuit Open Test Status
* Cylinder 1, 4, 6, or 7 Deactivation Solenoid Valve Control Circuit Low Voltage Test Status
* Cylinder 1, 4, 6, or 7 Deactivation Solenoid Valve Control Circuit High Voltage 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 (Service and Repair).
2. Disconnect the harness connector at the Q43 valve lifter oil manifold assembly.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E and ground.

• 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

• If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 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.

• If not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the K20 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
* Cylinder deactivation solenoid valve 3 terminal B
* Cylinder deactivation solenoid valve 4 terminal D

• If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

8. If all the circuits test normal, test or replace the Q43 valve lifter oil manifold assembly.

Component Testing

Static Test
1. Ignition OFF, disconnect the harness connector at the Q43 valve lifter oil manifold assembly.
2. Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the Q43 valve lifter oil manifold connector.
3. Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 ohm on each Q43 valve lifter oil manifold solenoid.

• If not within the specified range for each solenoid, replace the Q43 valve lifter oil manifold assembly.

4. Test for infinite resistance between each Q43 valve lifter oil manifold circuit terminal listed and the Q43 valve lifter oil manifold housing.

• If less than infinite resistance, replace the Q43 valve lifter oil manifold assembly.

Dynamic Test
1. Ignition OFF, disconnect the harness connector at the Q43 valve lifter oil manifold assembly.
2. Connect the cable that is labeled power from the displacement on demand DOD tester to the connector.
3. Connect the power leads from the DOD tester to B+ and ground.
4. Command each valve lifter oil manifold solenoid ON and OFF using the DOD tester. You should be able to hear each solenoid turn ON and OFF.

• If the function does not perform as specified, replace the valve lifter oil manifold assembly.

Repair Instructions

* Valve Lifter Oil Manifold Replacement (Valve Lifter Oil Manifold Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming

Repair Verification

1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 60 s.
5. Engine running, command each cylinder deactivation solenoid ON and OFF with a scan tool, while observing the cylinder deactivation circuit status parameters. The circuit status parameters should change from OK to NOT Run or Not Run to OK.

• If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.

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