WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL GENERAL DESCRIPTION 1–14 Copyright © 2001 General Motors Corp. The internal harness change to all models for TID 2 production began in late December, 1997. The S/N breakpoints are shown in Table 1–2. Table 1–2.
TransID 2 S/N Breakpoint TransID 1 TransID 2 S/N at Thermistor and Transmission Model Harness P/N Harness P/N Wiring Change MD 3000/B 300/B 400 w/OLS 29529472 29533652 6510141464 MD 3000/B 300/B 400 w/o OLS 29529473 29533653 6510141470 MD 3070PT 29529474 29533654 6510142172 HD 4000/B 500 w/OLS 29529475 29533655 6610026328 HD 4000/B 500 w/o OLS 29529476 29533656 6610026319 6610034908 HD 4070/4076 N/A 29533657 (start of production) The new retarder thermistor used on TransID 2 retarder model transmissions has a molded connector and is the same on all TransID 2 retarders.
The TransID 1 and pre-TransID retarder thermistor had a two terminal connector attached to it when it was used on B 500R/HD 4000R transmissions. It was part of a retarder harness assembly when used on B300R/B 400R/MD 3000R transmissions. See Appendix Q which describes the new and old temperature sensors. A graph and a table of resistance values for different temperatures are also included in Appendix Q. Table 1–3 shows the old (pre-TransID and TransID 1) and the new (TransID 2) part numbers of the retarder temperature sensors and the serial number when the change was made. Table 1–3.
New Retarder Temperature Sensor S/N Breakpoint Transmission Model Former Thermistor Used P/N Where Former Thermistor Used New Thermistor P/N (TID 2) First S/N For New Thermistor B 300R/B 400R/MD 3000R built into retarder harness 29510662 15326309 6510142059 B 500R/HD 4000R built with connector attached 29511861 15326309 6610026472 3. TransID 3: Starting April 3, 2000, the TransID (TID) feature was changed from TID 2 to TID 3. A new internal harness was released to implement the TID 3 feature. Figure J–3 (Appendix J) shows the wiring schematic for the new internal harness. TID 1 and TID 2 internal harnesses have been maintained to service units built prior to April 3, 2000.
TID 3 is required to ensure that the auto- detect feature selects the proper calibration for the new friction plate material. Version 8A software was updated to include TID 3 capability as of October 1999. The table that follows shows the new Transmission Model TransID 1 Harness P/N TransID 2 Harness P/N S/N at Thermistor and Wiring Change MD 3000/B 300/B 400 w/OLS 29529472 29533652 6510141464 MD 3000/B 300/B 400 w/o OLS 29529473 29533653 6510141470 MD 3070PT 29529474 29533654 6510142172 HD 4000/B 500 w/OLS 29529475 29533655 6610026328 HD 4000/B 500 w/o OLS 29529476 29533656 6610026319 HD 4070/4076 N/A 29533657 6610034908 (start of production)