Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 1077
DME 7.8 DME 7.8 0 · 0-194P1579
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DME 7.8 DME 7.8 0
0-194P1579
111 Crankshaft Position Sensor Signal Implausible
Diagnosis conditions
• Engine running
Possible fault cause
♦Corrosion in the connector
♦Loose contact
Affected terminals
III/32, III/45 and III/46
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Remove connector.
2 Check connector for cor- ♦Visual inspection. Clean contacts.
rosion.
3 Check rpm/crankshaft ♦Measure resistance between 0.8 - 1.0 kΩ at 20 Replace rpm/crank-
position sensor. pins 1 and 2. °C. shaft position sen-
sor.
♦Measure resistance between ∞ Ω
pins 1 and 3.
4 Check signal with engine ♦Connect special tool 9637. The following dis-
tester. play should appear ♦Connect engine tester. Use spe-
on the oscilloscope. cial input, connect positive cable
to pin III/32, negative cable to
pin III/46.
♦Start engine or crank engine
with starter motor.
2873 P1579 0-194 page 1
Printed in Germany – 3, 2001 p1579
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