Checking wires to Transmission Control Module (TCM)

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen R32, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Connect test box to control module wiring harness. Refer to Test box, connecting for wiring test

Fig 1: 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check wires between test box and 2-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.

Terminal 1+socket 66

Terminal 2+socket 21

Wire resistance: max. 1.5 Ω

Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

Specified value: ∞ Ω

If no malfunctions are found in wires:

Replace Transmission Vehicle Speed Sensor (VSS) -G38-:

Refer to 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS

Erase DTC memory of Transmission Control Module (TCM). Refer to Diagnostic mode 4: Reset/erase diagnostic data
Generate readiness code. Refer to Readiness code, generating