Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 245
DME 7.8 DME 7.80 · Figure 1:
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DME 7.8 DME 7.80
Figure 1:
Figure 2:
Work instruction Display OK If not OK
2 Check TP voltage supply. ♦Connect special tool 9637 to Approx. 5 V ⇒ Step 4
wiring harness (DME control ⇒ Step 3
module plug)
♦Measure voltage between Pin III/
10 and Pin III/25
♦Switch on the ignition
3 Check voltage values of ♦Connect special tool 9637
throttle position sensors. ♦Switch on the ignition
♦Measure voltage between Pin III/ Approx. 0.7 - 0.9 V Replace throttle part
24 and Pin III/25 → End
♦Fully depress accelerator pedal Approx. 4.1 - 4.5 V
♦Measure voltage between Pin III/ Approx. 4.0 - 4.4 V
8 and Pin III/25
♦Fully depress accelerator pedal Approx. 0.5 V
→ End
4 Check wiring from throttle ♦Separate disconnection point to
part to DME control mod- throttle part
ule for continuity or short ♦Connect special tool 9637 to
circuit to B+ and ground wiring harness (DME control
module plug)
0-18 page 2 2442 P0121
p0121 Printed in Germany, 2000
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