Automatic transmission shift change signal, checking: Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM) J248 receives a gear change signal from the Transmission Control Module (TCM) via the CAN-Bus wire. The Engine Control Module (ECM) briefly reduces the amount of fuel injected. This reduces torque and gear change jolt.
Special tools, testers and auxiliary items required
- Scan Tool (ST) V.A.G 1551/1552 with cable V.A.G 1551/3
- Test box V.A.G 1598/22 (through my 1999)
- Test box V.A.G 1598/31 (from my 2000)
- Digital multimeter US 1119 (Fluke 83 or equivalent)
- Adapter set V.A.G 1594
- Wiring diagram