Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 765
DME 7.8 DME 7.8 0 · 0-122.1P1138
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DME 7.8 DME 7.8 0
0-122.1P1138
Throttle Position Sensor 1 – Above Limit
Diagnosis conditions
• Engine running
Possible fault cause
♦Short circuit in wiring
♦Throttle position sensor faulty
♦DME control module faulty
Affected terminals
Terminal I/7, I/9, III/10, III/24 and III/25
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Check voltage supply to ♦Connect special tool 9637. See Figure 1. Step 5.
throttle motor actuator ♦Connect motor tester (oscillo-
scope) to Pin I/7 and Pin I/9
♦Use special input
♦Switch on the ignition.
♦See Figure 1.
♦Fully depress accelerator pedal See Figure 2
Step 2
2442 P1138 0-122.1 page 1
Printed in Germany – 6, 2002 p1138
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