P0736
ALLISON AUTOMATIC TRANSMISSIONDTC P0736
DTC P0736 Step 1 - 4:
DTC P0736 Step 5 - 11:
Circuit Description for Allison Automatic Transmission
The Transmission Control Module (TCM) uses input from the input speed sensor and output speed sensor to determine gear ratios. The TCM then compares the known gear ratio to the calculated gear ratio for the current gear. DTC P0736 is a type A DTC.
Conditions for Running the DTC
^ The components are powered and ignition voltage is greater than 9V and less than 18 V.
^ Output speed exceeds 200 RPM.
^ Reverse is selected and attained.
^ DTCs P0716, P0717, P0721, P0722, P0726, and P0727 are not active.
Conditions for Setting the DTC
DTC P0736 sets when the calculated Reverse range ratio, steady state, detected by the TCM differs from the known Reverse range ratio.
Action Taken When the DTC Sets
^ The TCM illuminates the Malfunction Indicator Lamp (MIL).
^ Transmission will lock in NEUTRAL.
^ DTC P0736 will be stored in the TCM history.
^ The TCM freezes shift adapts (DNA).
^ TCM inhibits TCC encasement.
Conditions for Clearing the MIL/DTC
A scan tool can clear the code from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.
Diagnostic Aids
^ Incorrect ratio codes typically indicate mechanical conditions with specific clutches, i.e. C3 and C5 for Reverse range.
^ Incorrect ratio codes typically indicate mechanical conditions with specific clutches such as C3 and C5 for Reverse range.
^ Incorrect ratio code could indicate hydraulically failed solenoid. Check DTC information for specific solenoid.
^ You may have to drive the vehicle to experience fault.
Test Description
The numbers refer to the step numbers on the diagnostic table.
3. This step tests ignition voltage.
4. This step tests for current Reverse range ratio.
5. This step tests speed sensor readings.
6. This step tests for turbine speed not remaining at zero in Reverse range.
7. This step checks for evidence of clutch failure.