DTC 01242

DTC Code 01242, Final Stage In Control Module:
Questionable Signal

Special Tools, Testers And Auxiliary Items:
- VAG 1598/18 Test Box adaptor
- Fluke 83 Multimeter or equivalent
- VW 1594 Adaptor kit
- Wiring diagram

Work Sequence:
Display will appear as shown:

Rapid data transfer HELP
Select function XX

- Press 0 and 6 buttons to select Function 06 "End data transfer"
- Press Q button to enter input
- Switch OFF ignition





- Disconnect Metering Pump V54 harness connector -1-
- Measure resistance between pump terminals
Specification: 8 to 12 ohms

If specified resistance not obtained:
- Replace Metering Pump V54

If specified resistance obtained:





- Disconnect EGR Vacuum Regulator solenoid valve -2- from harness connector -1-
- Measure resistance at valve
Specification: 14 to 18 ohms

If specified resistance not obtained:
- Replace EGR Vacuum Regulator solenoid valve N18

NOTE: At room temperature (warmer than +15°C) resistance lies in the lower tolerance range. At operating temperature (80°C), it lies in the upper tolerance range.

If specified resistance obtained:





- Connect VAG 1598/18 Test Box adaptor to ECM wiring harness connector -1-
- Check wiring for open circuit between VAG 1598/18 Test Box adaptor and Metering Pump V54 harness connector using wiring diagram
Terminal 1 + socket 27
Terminal 2 + socket 45
Wire resistance: maximum 1.5 ohms





- Check wiring for open circuit between VAG 1598/18 Test Box adaptor and EGR Vacuum Regulator solenoid valve harness connector using wiring diagram:
Terminal 1 + socket 68
Terminal 2 + socket 25
Wire resistance: 1.5 ohm maximum





- Check for shorting between wires
Specification: infinite ohms

If no malfunction found:
- Replace ECM J248