P2072
DTC P2072
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category
DTC Descriptors
DTC P2072
- Throttle Actuator Control System - Ice Blockage
Circuit/System Description
The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position. The ECM performs diagnostics that monitor the voltage levels of both APP sensors, both TP sensors, and the throttle actuator control motor circuit. It also monitors the spring return rate of both return springs that are housed internal to the throttle body assembly. These diagnostics are performed at different times based on whether the engine is running, not running, or whether the ECM is currently in a throttle body relearn procedure. Every ignition cycle the ECM performs a quick throttle return spring test to make sure the throttle plate can return to the 7 percent rest position from the 0 percent position. This is to make sure that the throttle plate can be brought to the rest position in case of an actuator motor circuit failure
Conditions for Running the DTC
* The ignition is ON.
* The speed is less than 40 km/h (25 mph).
* The air intake temperature is greater than 40°C (104°F).
Conditions for Setting the DTC
The actual engine speed is greater than the desired engine speed by at least 200 rpm for longer than 10 seconds or the ECM detects 3 fuel cut off's due to engine over speed while the engine is idling
Action Taken When the DTC Sets
DTC P2072 is a type A DTC.
Conditions for Clearing the DTC
DTC P2072 is a type A DTC.
Reference Information
Schematic Reference
Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Throttle Actuator Control (TAC) System Description (Throttle Actuator Control (TAC) System Description)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Start the engine, rapidly move the accelerator pedal from the rest position, to wide open throttle position then back to the rest position. Repeat the procedure a four times. DTC P2072 should not set.
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. Disconnect the harness connector of the ECM. Ignition ON, load test for battery voltage on the ignition circuits at the ECM.
• If less than B+, repair the ignition circuit for an open/high resistance.
2. If all circuits/connections test OK, replace the ECM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) .
Engine Control Module Replacement (Service and Repair) for engine control module replacement, setup, and programming