Diagnostics

5R44E and 5R55E

Diagnostics

Diagnosing electronically controlled automatic transmissions is simplified using the following procedures. It is important to remember that there is a definite procedure to follow. Do not take shortcuts or assume that critical checks or adjustments have already been made. Follow the procedures as written to avoid missing critical components or steps. By following the diagnostic sequence, the technician will be able to diagnose and repair the concern the first time.


On-Board Diagnostic (OBD) with Scan Tool

NOTE: For detailed instruction and other diagnostic methods using the scan tool, refer to the scan tool tester manual and Computers and Control Systems Information.

These Self Tests should be used to diagnose the PCM and should be carried out in order.

- Self Test 1.0 - Visual Inspection
- Self Test 2.0 - Set Up
- Self Test 3.0 - Key ON Engine OFF (KOEO)
- Self Test 4.0 - Continuous Memory
- Self Test 5.0 - Key ON Engine Running (KOER)
- Special Test Modes
- Wiggle Test Mode
- Output Test Mode

- PCM Reset Mode
- Clearing the DTCs
- On-Board Diagnostic (OBD) II Drive Cycle
- Other Scan Tool Features

For information on other diagnostic testing features using the scan tool, refer to Computers and Control Systems Information. Other diagnostic methods include the following:

- Parameter Identification (PID) Access Mode
- Freeze Frame Data Access Mode