Test prerequisites
Courtesy of VOLKSWAGEN OF AMERICA, INC.
- The main fuses must be OK.
Courtesy of VOLKSWAGEN OF AMERICA, INC.
- The battery voltage must be at least 11.5 V.
- If the vehicle is equipped with air conditioning, this must be switched off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
- Exhaust system between Three Way Catalytic Converter (TWC) and cylinder head must be free of leaks
- Ignition switched on, engine not running.
- Fuel Pump (FP) relay -J17- must be OK.
- The signal from Brake Light Switch -F- and Brake Vacuum Vent Valve Switch -F47- -F85- must be OK, checking. See BRAKE LIGHT SWITCH -F- AND BRAKE PEDAL SWITCH (CRUISE CONTROL/DIESEL DIRECT FUEL INJECTION) -F47- SIGNAL, CHECKING
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- Engine Coolant Temperature (ECT) must be 85...110 °C display group 4, display zone 3.
- Intake Air Temperature (IAT) less than 80 °C display group 4, display zone 4.
- Three Way Catalytic Converter (TWC) temperature must be at least 380 °C display group 34, display zone 2.