Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 487
DME 7.8 DME 7.8 0 · 0-53.1P0335
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DME 7.8 DME 7.8 0
0-53.1P0335
Engine Speed Sensor Signal – Open Circuit
Diagnosis conditions
• Engine running
Possible fault cause
♦Corrosion in the connector
♦Open circuit or short circuit in the wiring harness
♦Rpm/crankshaft position sensor faulty.
♦DME control module faulty
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- 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. ♦Connect engine tester. Use spe- play should appear
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 P0335 0-53.1 page 1
Printed in Germany – 6, 2002 p0335
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