Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 999
DME 7.8 DME 7.8 0 · 0-166P1397
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DME 7.8 DME 7.8 0
0-166P1397
113 Camshaft position sensor 2 - signal implausible
Diagnosis conditions
• Engine running
Possible fault cause
♦Loose contact
♦Camshaft position sensor
Note!
♦If both CMP sensor signals are missing, the start will take at
least 10 seconds.
♦For safety reasons, the ignition timing is retarded.
Affected terminals
Terminals III/7, III/17 and III/18
Diagnosis/troubleshooting
Work instruction Display OK If not OK
1 Check CMP sensor volt- ♦Remove connector of CMP sen- Approx. 5 V ⇒ Step 2
age supply sor 2 ⇒ Step 5
♦Switch on the ignition
♦Measure voltage between Pin 1
and Pin 3
2 Check power supply wir- ♦Remove connector of CMP sen- 0 - 5 Ω
ing for continuity sor 2 ⇒ Step 3
♦Connect special tool 9637 to
wiring harness (DME control
module plug)
♦Measure resistance between
special tool 9637 Pin III/7 and
CMP sensor 2 plug Pin 3
♦Measure resistance between
special tool 9637 Pin III/17 and
CMP sensor 2 plug Pin 1
3 Replace DME control module ⇒ Step 4
2839 P1397 0-166 page 1
Printed in Germany, 2000 p1397
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