Porsche 1989 944 S2, Workshop Manual

Page: 37 / 167

944 Maintenance, Self-diagnosis
03
Measure the voltage between pin 1 and
engine
ground.
35
The voltage is within the range of approx. 150
mV - 900 mV depending on the mixture
composition.
Check the cable harness to the DME control
unit with reference to the circuit diagram.
Error code 1125
This error code indicates an error in the
area
of the intake air temperature sensor (NTC
1)
in the air-flow sensor.
Possible errors:
Ground fault
Short to positive
Wire discontinuity
NTC 1 defective
Testing the intake air temperature
sensor.
Connect an ohmmeter between terminal 44
and terminal 26 on the DME plug.
Display:
0°C =
15 - 30°C =
40°C =
4400 -
1400 -
1000 -
6800
3600
1300
If the values are not reached during this
testing step, measurement must be carried
out directly on the intake air tempertaure
sensor.
Connect an ohmmeter between pin 1 and
pin 4 on the air-flow sensor.
Display: as above
Troubleshooting
Printed in Germany - XVI, 1987
03 - 25