184000515 - K26 ENGINE COOLANT OVERHEATING WARNING LIGHT NOT WORKING

With the ignition ON, the engine coolant temperature gauge in the instrument panel is not working;
the engine temperature signal and the engine temperature sensor failure signal is made available by the 'engine management node' at the C-CAN network; the 'body computer node' makes the message available through the gateway at the B-CAN network and then at the instrument panel.
Results of the tests
0PRELIMINARY CHECKAll OKProblems metOperation
Check that the engine management warning light is not on with the engine startedContinue to Step 3warning light onContinue to Step 1
1CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the Examiner to the diagnostic socketCheck that there are no faults at the Engine Management NodeContinue to Step 2Presence of faultsContinue following the instructions for the diagnostic equipment
2ENGINE MANAGEMENT FAULTS CHECKAll OKProblems metOperation
The panel signals errors that the engine management control unit does not see: continue as instructed See table K101 M.I.L WARNING LIGHT STAYS ON End of diagnosis.
3CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Keeping the Examiner connected to the diagnostic socket, check the operation of the warning light in the instrument panel through active diagnosisContinue to Step 4The warning light does not come onReplace instrument panel Op. 5560B11
4ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation
1.2 16v1.4 16vCheck the continuity/insulation of the cable between the engine coolant temperature sensor, engine management control unit, Body Computer and instrument panel See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT Continue to Step 5Cables broken/not insulatedRestore the cable continuity/insulation: See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
1.3 JTD 16vCheck the continuity/insulation of the cable between the engine coolant temperature sensor, engine management control unit, Body Computer and instrument panel See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT Continue to Step 5Cables broken/not insulatedRestore the cable continuity/insulation: See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsReplace the Body Computer Op. 5505A32