TDI system current supply, checking: Checking

WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Switch ignition off.
Connect VAG1598/18 test box to Diesel DFI ECM connector.
Bridge sockets 42 and 46 using adapters from VW1594 connector test kit.

Fig 1: Connecting VAG1598/18 Test Box To Diesel DFI ECM Connector

Measure voltage between test box sockets:
- 45 and 1
- 68 and 1
- 23 and 1
- 23 and 24
- Specification: approx. battery voltage (B+)

If voltage is not OK:

Check power supply (terminal 30. B+) relay - J317- at terminal 30.
Check wiring connections for open circuit, short circuit and contact resistance at terminals, using wiring diagrams.

If the wiring and the relay are OK:

Replace Diesel DFI ECM -J248-, see item 3 .
Display readiness code, see READINESS CODE, DISPLAYING .

If DTC memory was erased:

Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .