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Fault diagnosis, temperature gauge (MIU 2)

Fault diagnosis, temperature gauge (MIU 2)

Fault symptom

The temperature gauge always indicates too low a temperature L.

Diagnostic procedure



1. Since no diagnostic trouble code (B1715) is present in the main instrument display panel, the temperature signal from the ICE module is OK. This can be checked by connecting the ISAT Scan Tool and selecting "MAIN INSTRUMENT" followed by "READ VALUES" and "COOLANT TEMP.".

If the temperature signal is OK, the temperature shown on the Scan Tool's display should correspond to the temperature of the coolant.

2. Check the operation of the temperature gauge by selecting "TEST FUNCTIONS" on the Scan Tool followed by "TEMP GAUGE TEST".

If in proper working order, the temperature gauge needle should move from the lower end of the scale to the upper end.

If it does not, remove the main instrument display panel's rear section complete with processor card and check that all leads connected to the connector marked CN3 are securely located.

If any lead has worked loose or is broken, continue on

If the leads to the connector are all OK, the fault is probably in the intermediate part with the indicating instruments. Continue on .