Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 885
DME 7.8 DME 7.8 0 · 0-154P1344
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DME 7.8 DME 7.8 0
0-154P1344
579 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 59/3 pin 4
Work instruction Display OK If not OK
1 Check triggering wire for ♦Connect special tool 9637 to 0 - 5 Ω
continuity wiring harness (DME control
module plug)
♦Remove connector of 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 of 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 8 - 12 Ω at 20° C
noid hydraulic valve hydraulic valve between pin 1
and 2
3755 P1344 0-154 page 1
Printed in Germany – 2, 2000 p1344
This is a source reference. Confirm exact model applicability in the original material.