P161B

DTC P061B or P161B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P061B
- Control Module Torque Calculation Performance

DTC P161B
- Control Module Torque Performance

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM) and the throttle actuator control (TAC) system.

Conditions for Running the DTC

The ignition is ON, or the engine is operating.

Conditions for Setting the DTC

P061B

The ECM detects an internal control module torque calculation performance condition.

P161B

The ECM detects that the delivered torque does not match the desired torque.

Action Taken When the DTC Sets

DTCs P061B, and P161B are Type A DTCs.

Conditions for Clearing the DTC

DTCs P061B, and P161B are Type A DTCs.

Circuit/System Verification

1. Ignition ON, observe the scan tool DTC information parameter. DTCs P061B or P161B should not set.
2. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Important: In extreme cold weather conditions ice may form in the vacuum hose to the MAP sensor and may set a DTC. Inspect the MAP sensor vacuum hose for ice, or other restrictions.

1. Ignition ON, observe the scan tool MAP sensor data parameter. Start the engine, verify the MAP sensor data parameter changes.

• If the MAP data parameter does not change, Refer to DTC P0107 or P0108 for further diagnosis. P0107 P0108

2. Verify there is not an engine vacuum leak.
3. Test for a parasitic load on the following components:

* Generator
* A/C compressor
* Transmission

• If a condition is found, repair as necessary.

4. If all conditions test normal, replace the ECM

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Programming and Relearning for ECM setup, and programming Programming and Relearning