Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 256
DME 7.8 DME 7.8 0 · 0-18.5P0128
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DME 7.8 DME 7.8 0
0-18.5P0128
Blocked Thermostat - Signal Implausible
Diagnosis conditions
• Engine starting temperature between -10° C and +45° C
• Idle speed
Possible fault cause
Note!
♦Fault P0128 is only stored in conjunction with fault P0116
(Engine temperature).
♦If the coolant shutoff valve or the transmission oil temperature
sensor are stored, remedy the fault first.
♦Open coolant control
♦Open coolant shutoff valve
Affected terminals
-
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Check engine tempera- ♦see P0115 or P0116
ture sensor.
2 Check coolant control
3 Check coolant shutoff
valve.
1958 P0128 0-18.5 page 1
Printed in Germany – 6, 2002 p0128
This is a source reference. Confirm exact model applicability in the original material.