Basic Troubleshooting: Notes
AW30-40LS transmission, with Transmission Control Module (TCM), differs from the Mechanical - Hydraulic control type transmissions. Accordingly, its troubleshooting procedure differs also.
Before troubleshooting an TCM, first determine whether the problem is electrical or mechanical. To do this, just refer to the basic troubleshooting flowchart provided below. See Fig 1.
If the cause is already known, using the basic troubleshooting chart below along with the troubleshooting chart should speed the procedure.