Torque Reduction/Engine Torque/Engine Speed Signal

Torque Reduction / Engine Torque / Engine Speed Signal Description

When operating normally, the Automatic Transmission Control Module will ask the engine to reduce the output torque while a gear change is taking place.
The torque signal informs the Automatic Transmission Control Module of the engine output torque, which in turn enables the Automatic Transmission Control Module to calculate how much engine torque reduction, is required.

An engine speed signal is sent by the Body Electronics Control Module (BeCM) to the Automatic Transmission Control Module via a direct hardwired link.

There is one diagnostic check of the Torque Reduction Signal.
A fault is detected if:
1. An error message is received from the ECM - The torque reduction PWM duty cycle is less than 92% or greater than 94%.

There are two diagnostic checks of the Engine Torque Signal.
A fault is detected if:
1. Frequency check - The frequency of the Engine Torque Signal is not 91± 1 Hz and the PWM duty cycle is less than 5% or greater than 94%.
2. Pulse check - The Engine Torque Signal has no presence of rising or falling edges.

There are two diagnostic checks of the engine speed signal.
A fault is detected if:
1. Out of range check - The engine speed signal indicates an engine speed of greater than 6100 RPM.
2. Pulse check - The Engine Speed Signal has no presence of rising or falling edges,

For the diagnostic table, please refer to the individual codes (i.e. P0726. P0727, P1608 or P1609). P0726

If the above table does not include details of the following enabling conditions: - IAT, ECT, vehicle speed range, and time after engine start-up then the state of these parameters has no influence upon the execution of the monitor.