Electrical testing with (VAG1598 test box): Requirements

WARNING: This page is about a different car, the 1995 Volkswagen Jetta III, 1995 Volkswagen GTI, and 1994 Volkswagen Jetta III. However, it is still accessible from the selected car via links, so may be relevant.

Battery Positive Voltage (B+) OK
Fuses 18 (S18) and 21 (S21) OK
Ground (GND) connections on engine and transmission OK (location of engine Ground (GND) connection: on support for upper intake manifold). See MULTIPORT FUEL INJECTION (MFI) - 2.8L VR6, AA .
Fuel Pump (G6) and Fuel Pump Relay (J17) OK
- Switch ignition OFF.
- Disconnect connector -1- from Motronic Engine Control Module (J220) -2-.
  
  Fig 1: Disconnecting Connector From Motronic Engine Control Module
- Connect VAG 1598 test box and VAG 1598/18 adapter to Motronic Engine Control Module (ECM) harness connector.
- Carry out tests according to table. See ELECTRICAL TEST TABLE .

CAUTION: Switch multimeter to the appropriate measuring range before connecting the test leads to avoid damaging electronic components.

NOTE: After electrical testing on vehicles with automatic transmission, the DTC "Engine/trans. electrical connection: open circuit" is stored in the Transmission Control Module (TCM) and must be erased. See ON BOARD DIAGNOSTIC (OBD) .