P0736

ALLISON AUTOMATIC TRANSMISSION

DTC P0736





Test 1-4





Test 5-10

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 9 V and less than 18 V.
^ Output speed exceeds 200 RPM.
^ Reverse is selected and attained.
^ DTCs P0716, P0717, PO7217 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
^ Transmission will lock in NEUTRAL.
^ DTC P0736 will be stored in the TCM history.
^ The TCM freezes shift adapts (DNA).
^ Illuminates the MIL when active.
^ TCM inhibits TCC engagement.

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 code could indicate hydraulically failed solenoid. Check DTC information for specific solenoid.
^ You may have to drive the vehicle to experience fault. Clutch test mode can be used to check stall speed.

Test Description
The numbers below 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 for noise induced from the engine speed sensor.
6. This step tests for turbine speed not remaining at zero in Reverse range.
7. This step checks for evidence of clutch failure.