Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 171
DME 7.8 DME 7.8 0 · 0-8.9P0026
Read extracted page text
OCR can contain errors. Check the original page image for exact wording, warnings and specifications.
DME 7.8 DME 7.8 0
0-8.9P0026
Valve lift control, bank 1 output stage - open circuit
Diagnosis conditions
• Engine running
Possible fault cause
♦Open circuit in triggering wire
♦Open circuit in B+ supply
♦Solenoid hydraulic valve faulty
Affected terminals
III/1
Diagnosis/troubleshooting
Note!
The wiring for the solenoid hydraulic valve is routed via the connector X 59/2 pin 8
Work instruction Display OK If not OK
1 Check triggering wire for ♦Connect special tool 9637 to 0 - 5 Ω Repair wiring har-
continuity. wiring harness (DME control ness
module plug).
♦Remove connector on the sole-
noid hydraulic valve
♦Measure resistance between III/
1 and solenoid hydraulic valve
connector pin 2
2 Check B+ supply for sole- ♦Remove connector on the sole- Battery positive volt-
noid hydraulic valve noid hydraulic valve age
♦Switch on the ignition.
♦Measure voltage of solenoid
hydraulic valve connector pin 1
and ground
3 Check resistance of sole- ♦Measure resistance of solenoid 11 - 15 Ω at 20° C. Replace solenoid
noid hydraulic valve hydraulic valve between pin 1 hydraulic valve
and 2
3755 P0026 0-8.9 page 1
Printed in Germany – 8, 2002 p0026
This is a source reference. Confirm exact model applicability in the original material.