P161B

DTC P161B: Control Module Torque Performance

Circuit Description
This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM) and the Throttle Actuator Control (TAC) system.

Conditions for Setting the DTC
There are 3 separate tests that can set this DTC code.
Test 1 (Torque Control)
- The engine is operating.
- The ECM detects that the delivered torque does not match the desired torque.

Test 2 (Steady State Torque Control)
- The engine is operating.
- Engine speed > 800 rpm
- Desired Flywheel torque is within 20 N-m band for 1 sec.
- The ECM detects that the delivered torque does not match the desired torque.

Test 3 (Redundant Torque Return)
- Pedal Position < 0.8%
- Engine Speed - Desired Engine Speed > 0
- Driver input is the desired torque source.
- Injectors are enabled.
- The ECM detects that the fuel flow exceeds requirements.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fail. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF after a consecutive ignition cycle in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.

Step 1-4:

Step 5-6:

Troubleshooting