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Porsche 944 User Manual

Page 37

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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

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