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Code 3-1-1 signal missing from speedometer 900

uid 60851's pic
posted by  Grey245 on  Mon Aug 30 22:22 CST 2021
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3-1-1 does not seem to be linked to a CEL scenario. Are there any codes on socket #6?

Asumming LH Jetronic on your vehicle:
The speed (VSS) signal from the diff goes to the instrument cluster first. That cluster modifies it and hands it trough to the ECU. The fact that the speed seems to register more or less correct (a slight but steady deviation may be caused by something as simple as a different tyre size) means the sensor and wiring to the cluster are likely OK.

There may be several causes, one of which is a bad contact in the connectors to the ECU and EZK units. Should be fairly easy to check.





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New Code 3-1-1 signal missing from speedometer [900]
posted by  muskox37  on Mon Aug 30 17:07 CST 2021 >


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