Diagnostic Procedure
Document the vehicle symptoms by completing the Driver Questionnaire.
Set vehicle parking brake and chock wheels.
Key on with engine off.
Connect ServiceRanger.
Retrieve Snapshot and VPA data by creating a Service Activity Report within ServiceRanger. Select “Send to Eaton”.
Update transmission software to latest available level.
Note: To avoid damaging the TECU, use an Eaton-approved communications adapter and ensure all satellite systems are disabled before updating software.
Retrieve and record the transmission fault codes and FMIs, and their occurrences and timestamps.
If a vehicle/engine fault code(s) is Active, contact OEM for further diagnostic instructions.
If a transmission fault code(s) is Active, Go to Step F
If a transmission fault code(s) is Inactive or not set, Go to Step B
If ServiceRanger does not connect to the Transmission Electronic Control Unit (TECU), go to the Power-Up Sequence.
Key on with engine running.
If the engine cranks and runs, Go to Step C
If the display indicates “F” during the engine crank or while the engine is running, retrieve fault code(s) with ServiceRanger. Go to Step F
If the engine does not crank and the display indicates “N”, refer to OEM guidelines for repair or replacement of the vehicle starting/charging/battery system.
Key on with engine running.
Depress and hold the service brake.
Select a forward and reverse mode from neutral.
If the transmission engages a gear, re-select neutral mode. Go to Step D
If the display indicates “F” during the mode selection and/or engagement of a gear, re-select neutral mode. Retrieve fault code(s) with ServiceRanger, Go to Step F
If the transmission does not engage a gear and the display indicates “N”, re-select neutral mode and go to the Brake Switch Functionality Test
Drive or operate the vehicle (road test), attempt to duplicate the vehicle symptom and set a fault code under the conditions reported in the Driver Questionnaire.
If the symptom was duplicated and/or the display indicated “F”, Go to Step E
If the symptom was not duplicated, no problem was found, test complete. Contact Eaton Cummins Automated Transmission at 1-800-826-HELP (4357) for further diagnostic instructions.
Set vehicle parking brake and chock wheels.
Key off and allow the TECU to perform a complete power down.
Key on.
Connect ServiceRanger.
Retrieve Snapshot and VPA data by creating a Service Activity Report within ServiceRanger. Select “Send to Eaton Cummins Automated Transmission”.
If a vehicle/engine fault code(s) set during the road test, contact OEM for further diagnostic instructions.
If a transmission fault code(s) set during the road test, Go to Step F
If a fault code did not set during the road test and the symptom was duplicated, go to the Transmission Shift Complaint Test.
Determine the fault code to troubleshoot first by using the priority index below (with 1 highest priority and 4 least priority).
- Priority 1: 11, 12, 81, 84, 85, 99
- Priority 2: 15, 16, 19, 26, 27, 33, 34, 35, 36, 37, 61, 63, 66, 67, 74, 76
- Priority 3: 13, 14, 17, 21, 22, 23, 29, 43, 44, 46, 51, 52, 56, 57, 58, 64, 65, 68, 83
- Priority 4: 41, 42, 45, 71, 72, 73
Go to the Fault Code Isolation Procedure Index and troubleshoot the fault code with the highest priority level.
If more than one fault code within a level applies, troubleshoot Active fault codes before Inactive fault codes.
If only Inactive fault codes are present, troubleshoot the fault code that has the highest occurrence count or most recent timestamp.
If no fault codes are found, match the vehicle symptom to the appropriate item in the Symptom-Driven Diagnostics Index