2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2974

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2974

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

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

* The engine will return to V8 mode.

* The fuel injector will turn OFF for the cylinder that has a cylinder deactivation DTC set, resulting in an engine misfire.

Conditions for Clearing the DTC

DTCs 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 (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Cylinder Deactivation (Active Fuel Management) System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and

Inspection/Component Tests and General Diagnostics/Cylinder Deactivation (Active Fuel Management) System Diagnosis)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)