Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 601
DME 7.8 DME 7.8 0 · 0-81.1P0513
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DME 7.8 DME 7.8 0
0-81.1P0513
Immobilizer – Signal Implausible
Diagnosis conditions
• Start condition
• Motronic reset
Possible fault cause
♦Open circuit in wiring between DME control module and alarm
system
♦Short circuit to ground or short circuit to B+
♦Alarm system control module faulty
Affected terminals
-
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Check signal wire for con- ♦Remove connector I of alarm 0 - 5 Ω Step 2.
tinuity system control module Step 3.
♦Connect special tool 9637 to
wiring harness (DME control
module plug).
♦Measure resistance between
special tool 9637 Pin I/3 and
alarm system control module
plug Pin I/23
2 Remove connector X 2/3 ♦Measure resistance between 0 - 5 Ω Repair wiring har-
plug connection X 2/3 bushing Step 3. ness
6 and special tool 9637 Pin I/3 → End.
♦Measure resistance between
plug connection X 2/3 Pin 6 and
alarm system control module
plug I Pin 23
9068 P0513 0-81.1 page 1
Printed in Germany – 6, 2002 p0513
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