Tech 1 is an earlier handheld diagnostic platform used on GM and Opel/Vauxhall vehicles; a Suzuki-specific application also operated on the tool. The brand application, cartridge, leads and adapters determine coverage. It was followed in GM's diagnostic-tool family by Tech 2; the generations can overlap in coverage, so no single model-year cutoff should be assumed. GM Service Training Center Tech 1 guide; Opel/Vauxhall C20LET workshop manual.
Tech 1A and cartridge applications
Vetronix's GM Chassis Application manual describes Tech 1's original introduction in 1984 and Tech 1A as an updated version released in 1989. The same manual notes the retirement of both in 2003; this is a vendor timeline, not a universal vehicle-coverage date. Vetronix GM Chassis Application manual.
The Opel/Vauxhall C20LET manual lists a Tech 1, a 10-pin adapter for the Calibra diagnostic connector and an “Opel/Vauxhall 87-94 ECU GB” program module. The numbers in that module's name are not proof that every vehicle or system from those years is covered. C20LET workshop manual, special tools.
Suzuki ECM 6.0 documentation describes a separate mass-storage cartridge application for engine and, where applicable, automatic-transmission powertrain diagnosis. The manual excludes North American OBD-II vehicles from model year 1996 onwards from this application; use its own model and ECU table. Suzuki ECM 6.0 operator's manual. See Suzuki diagnostic systems and Opel/Vauxhall diagnostic systems.
Model and year coverage examples
| Manufacturer / application | Model or year scope documented | What the source establishes |
|---|---|---|
| GM Tech 1 and Tech 1A | Tech 1 introduced 1984; Tech 1A updated version released 1989; Vetronix says both retired in 2003 | Tool-generation dates, not a vehicle model-year boundary. |
| Opel / Vauxhall | C20LET / Calibra-specific example; source lists Opel/Vauxhall “87–94 ECU GB” program module | One engine/software application, not blanket coverage for every 1987–94 vehicle. See Opel/Vauxhall later coverage. |
| Suzuki | ECM 6.0 cartridge application; excludes North American OBD-II vehicles from MY1996 onward | Use Suzuki’s model/ECU application table; this does not say all earlier Suzuki models are covered. See Suzuki systems. |
Sources: Vetronix GM Chassis Application manual; Opel/Vauxhall C20LET workshop manual; Suzuki ECM 6.0 manual.