WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL S ECTION 3 — BASIC KNOWLEDGE Copyright © 2001 General Motors Corp. 3–1. BASIC KNOWLEDGE REQUIRED To service WTEC III Electronic Controls, the technician must understand basic electrical concepts. Technicians need to know how to use a volt/ohmmeter (VOM) to make resistance and continuity checks. Most troubleshooting checks consist of checking resistance, continuity, and checking for shorts between wires and to ground. The technician should be able to use jumper wires and breakout harnesses and connectors. Technicians unsure of making the required checks should ask questions of experienced personnel or find instruction.
The technician should also have the mechanical aptitude required to connect pressure gauges or transducers to identified pressure ports used in the troubleshooting process. Pressure tap locations and pressure values are shown in Appendix B — Checking Clutch Pressures. Input power, ground, neutral start circuitry, etc., can cause problems with electronic controls or vehicle functioning and may not generate a diagnostic code. A working knowledge of WT Series Electronic Controls vehicle installation is necessary in troubleshooting installation-related problems. Refer to Section 8 for information concerning performance complaints (non-code) troubleshooting.
A complete wiring schematic is shown in Appendix J. Refer to the WTEC III Controls and General Information Sales Tech Data Book for information concerning electronic controls installation and the Installation Checklist. Reliable transmission operation and performance depend upon a correctly installed transmission. Review the Installation Checklist in the MD, HD, B 300/B 400, and B 500 Sales Tech Data Books to ensure proper installation. NOTE: Allison Transmission is providing for service of wiring harnesses and wiring harness components as follows:
• Repair parts for the internal wiring harness and for wiring harness components attached to the shift selector will be available through the Allison Transmission Parts Distribution Center (PDC). Use the P/N from your appropriate parts catalog or from Appendix E in this manual. Allison Transmission is responsible for warranty on these parts. • Repair parts for the external harnesses and external harness components must be obtained from St. Clair Technologies Inc. (SCTI). SCTI provides parts to any Allison customer or OEM and is responsible for warranty on these parts. SCTI recognizes ATD, manufacturers, and SCTI part numbers. SCTI provides a technical HELPLINE at 519-627-1673 (Wallaceburg).
SCTI will have parts catalogs available. The SCTI addresses and phone numbers for parts outlets are: St. Clair Technologies, Inc. St. Clair Technologies, Inc. St. Clair Technologies, Inc. 1050 Old Glass Road 1111 Mikesell Street c/o Mequilas Tetakawi Wallaceburg, Ontario, Canada, N8A 3T2 Charlotte, Michigan 48813 Carr. Internationale KM 1969 Phone: (519) 627-1673 Phone: (517) 541-8166 Guadalajara – Nogales, KM2 Fax: (519) 627-4227 Fax: (517) 541-8167 Empalme, Sonora, Mexico Phone: 011-52-622-34661 Fax: 011-52-622-34662 • St. Clair Technologies, Inc. stocks a WTEC III external harness repair kit, P/N 29532362, as a source for some external harness repair parts.
SCTI is the source for external harness repair parts. The technician should also have the mechanical aptitude required to connect pressure gauges or transducers to identified pressure ports used in the troubleshooting process. Pressure tap locations and pressure values are shown in Appendix B — Checking Clutch Pressures. Input power, ground, neutral start circuitry, etc., can cause problems with electronic controls or vehicle functioning and may not generate a diagnostic code. A working knowledge of WT Series Electronic Controls vehicle installation is necessary in troubleshooting installation-related problems.
Refer to Section 8 for information concerning performance complaints (non-code) troubleshooting. A complete wiring schematic is shown in Appendix J. Refer to the WTEC III Controls and General Information Sales Tech Data Book for information concerning electronic controls installation and the Installation Checklist. Reliable transmission operation and performance depend upon a correctly installed transmission. Review the Installation Checklist in the MD, HD, B 300/B 400, and B 500 Sales Tech Data Books to ensure proper installation. NOTE: Allison Transmission is providing for service of wiring harnesses and wiring harness components as follows:
• Repair parts for the internal wiring harness and for wiring harness components attached to the shift selector will be available through the Allison Transmission Parts Distribution Center (PDC). Use the P/N from your appropriate parts catalog or from Appendix E in this manual. Allison Transmission is responsible for warranty on these parts. • Repair parts for the external harnesses and external harness components must be obtained from St. Clair Technologies Inc. (SCTI). SCTI provides parts to any Allison customer or OEM and is responsible for warranty on these parts. SCTI recognizes ATD, manufacturers, and SCTI part numbers. SCTI provides a technical HELPLINE at 519-627-1673 (Wallaceburg).
SCTI will have parts catalogs available. The SCTI addresses and phone numbers for parts outlets are: St. Clair Technologies, Inc. St. Clair Technologies, Inc. St. Clair Technologies, Inc. 1050 Old Glass Road 1111 Mikesell Street c/o Mequilas Tetakawi Wallaceburg, Ontario, Canada, N8A 3T2 Charlotte, Michigan 48813 Carr. Internationale KM 1969 Phone: (519) 627-1673 Phone: (517) 541-8166 Guadalajara – Nogales, KM2 Fax: (519) 627-4227 Fax: (517) 541-8167 Empalme, Sonora, Mexico Phone: 011-52-622-34661 Fax: 011-52-622-34662 • St. Clair Technologies, Inc. stocks a WTEC III external harness repair kit, P/N 29532362, as a source for some external harness repair parts.
SCTI is the source for external harness repair parts.