Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 799
DME 7.8 DME 7.8 0 · 0-124P1158
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DME 7.8 DME 7.8 0
0-124P1158
30 Engine Compartment Temperature Sensor - Above
Limit
Diagnosis conditions
• Ignition on
Possible fault cause
♦Temperature sensor
♦Short circuit to B+
Affected terminals
II/21
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Check temperature sen- ♦Remove plug of temperature Approx. 2.2 - 2.6 kΩ Replace tempera-
sor. sensor. at 20° C ture sensor.
♦Measure resistance between
temperature sensor pin 1 and
pin 2.
2 Check wiring harness for ♦Connect special tool 9637 to 0 V Repair wiring har-
short to B+. wiring harness (DME control ness.
module plug).
♦Remove plug of temperature
sensor.
♦Measure voltage between spe-
cial tool 9637 pin II/21 and
ground.
♦Switch on the ignition.
1914 P1158 0-124 page 1
Printed in Germany – 3, 2001 p1158
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