Porsche 1989 944 S2, Workshop Manual

Page: 36 / 167

03
Maintenance, Self-diagnosis 944
Error code 1123
When this error code appears, the Lambda
control has detected too rich ar too lean
a mixture.
Possible causes for too lean a mixture:
Lambda probe ground fault
Intiltrated air on the intake side
Intiltrated air on the exhaust side of the
Lambda probe
Injection valve does not open
Ignition cut-out
Fuel pressure too low
Possible causes for too rich a mixture:
No partial vaccum on the pressure
regulator
Injection valve does not close
Return to the fuet tank clogged.
Error code 1124
This error code draws attention to an error
in the area of the Lambda probe.
Possible errors:
Ground fault
Short to positive
Wire discontinuity
Testing the Lambda probe signal.
Figure 87/906
Disconnect the Lambda probe plug.
Note:
The voltage af the Lambda probe must
only
be measured using a digital voltmeter, or
only using a comparable measuring instru-
ment with an internal resistanee (Ri) of no
less than 10 M .
03 - 24 Troubleshooting
Printed in Germany - XVI, 1987