Diesel Direct Injection System Power Supply, Checking

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1598/22 Test Box
- Fluke 83 multimeter
- VW 1594 Adaptor kit
- Wiring diagram

Test prerequisites:

- Battery voltage OK. (11.5 Volts minimum)

Test sequence

- Switch OFF ignition.
- Connect VAG 1598/22 Test Box to ECM wiring harness.







- Bridge sockets 33 + 1 using jumper wires from VW 1594 adaptor kit.
- Measure voltage between sockets 2 + 1, 28 + 1, 27 + 2 and 28 + 27
- Specification: approx. battery voltage

If specification not obtained:
- Check voltage supply relay terminal 30 J317.
- Check wiring connections at terminals for open circuit, short circuit and transfer resistance using Wiring diagram.

If wiring and relay OK:
- Replace Diesel direct injection system ECM J248.
- Display Readiness code. Testing and Inspection
If DTC memory has been erased
- Create Readiness code. Testing and Inspection