Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 246
DME 7.8 DME 7.8 0 · Work instruction
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DME 7.8 DME 7.8 0
Work instruction Display OK If not OK
♦Measure resistance between 0 - 5 Ω Repair wiring har-
disconnection point Pin 1 and ness
special tool 9637 Pin I/9 ⇒ End
♦Measure resistance between 0 - 5 Ω
disconnection point Pin 2 and
special tool 9637 Pin III/25
♦Measure resistance between 0 - 5 Ω
disconnection point Pin 3 and
special tool 9637 Pin III/10
♦Measure resistance between 0 - 5 Ω
disconnection point Pin 4 and
special tool 9637 Pin I/7
♦Measure resistance between 0 - 5 Ω
disconnection point Pin 5 and
special tool 9637 Pin III/8
♦Measure resistance between 0 - 5 Ω
disconnection point Pin 6 and
special tool 9637 Pin III/24
♦Measure resistance between ∞ Ω
disconnection point Pin 4 and
ground
♦Measure resistance between ∞ Ω
disconnection point Pin 5 and
ground
♦Measure resistance between ∞ Ω
disconnection point Pin 6 and
ground
♦Switch on the ignition 0 V
♦Measure voltage between dis-
connection point Pin 4 and
ground
♦Measure voltage between dis- 0 V
connection point Pin 5 and
ground
♦Measure voltage between dis- 0 V
connection point Pin 6 and ⇒ Step 5
ground
2442 P0121 0-18 page 3
Printed in Germany, 2000 p0121
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