P2071
DTC P2070 or P2071
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 P2070
- Intake Manifold Tuning Control Valve Stuck Open
DTC P2071
- Intake Manifold Tuning Control Valve Stuck Closed
Circuit/System Description
The intake manifold tuning valve controls the length of the intake runners in the intake manifold. The intake manifold contains both long and short runners. The tuning valve controls only the short runners. When the valve is closed, the short runners are blocked, which forces the air through the long runners. This results in tuning effects in the manifold that increases the torque produced by the engine at lower engine speeds. When the valve is open, both the long runners and short runners are open, but the majority of the air travels through the short runners, since the air will naturally follow the shortest path into the cylinder. This allows the air to flow through the short runners, which results in increased torque at higher engine speeds.
Ignition voltage is supplied directly to the intake manifold tuning valve actuator. The engine control module (ECM) controls the valve actuator motor by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage signal.
The tuning valve actuator contains a position sensor, which outputs a pulse width modulated (PWM) signal, to detect the actual position of the tuning valve in relation to its commanded position. Variations in the duty cycle of the PWM signal enables the ECM to detect a physically broken, restricted or stuck tuning valve.
Conditions for Running the DTC
* DTCs P0660, P2077 or P2078 are not set.
* The DTCs run continuously when the above condition is met for greater than 4 s.
Conditions for Setting the DTC
P2070
The ECM detects the time after the close command without the intake manifold tuning valve reaching the closed position is greater than 5 s.
P2071
The ECM detects the time after the open command without the intake manifold tuning valve reaching the open position is greater than 5 s.
Action Taken When the DTC Sets
DTC P2070 and P2071 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2070 and P2071 is a Type B DTC.
Diagnostic Aids
* Ignition ON, command the Intake Manifold Tuning Solenoid Valve Open and Closed with a scan tool and observe if anything interferes with the motion.
* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit test status parameters for the component. A circuit test status parameter will change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Air Intake System Description Air Intake System Description
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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON
2. Verify that DTC P0660, P0661, P0662, P2077, or P2078 is not set.
• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
• If none of the DTCs are set.
3. Verify the Q22 Intake Manifold Tuning Solenoid Valve Opens and Closes when commanding the Intake Manifold Tuning Control Valve Open and Closed with a scan tool.
• If the valve does not Open and Close
Refer to Circuit/System Testing
• If the valve Opens and Closes
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing
• If the DTC does not set
6. All OK
Circuit/System Testing
1. Verify the following conditions do not exist with the Q22 Intake Manifold Tuning Solenoid Valve assembly:
* Disconnected or damaged linkage
* Linkage binding
* Interference with hoses, wiring, or any other components
• If a condition is located
Repair or replace the affected component as necessary.
• If all components test normal
2. Disconnect the linkage from the Q22 Intake Manifold Tuning Solenoid Valve.
3. Verify the Q22 Intake Manifold Tuning Solenoid Valve Opens and Closes when commanding the Intake Manifold Tuning Control Valve Open and Closed with a scan tool.
• If the solenoid valve does not Open and Close
Replace the intake manifold
• If the solenoid valve Opens and Closes
4. Verify the following conditions do not exist with the intake manifold:
* Carbon build-up that limits or restricts the movement of the intake manifold tuning valve vanes.
* Casting flash that limits or restricts the movement of the intake manifold tuning valve vanes.
* Foreign material that limits or restricts the movement of the intake manifold tuning valve vanes.
• If a condition is located
Repair or replace the intake manifold as necessary.
• If all components test normal
5. Replace the intake manifold.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Intake Manifold Replacement
* Control Module References Control Module References for ECM replacement, programming, and setup.