3233083 - K25 ENGINE COOLANT TEMPERATURE GAUGE NOT WORKING

With the ignition key in the ON position, the coolant temperature gauge indicator on the central instrument is not working properly (it indicates a different level from the true engine value)
Results of the tests
1CHECKING CENTRAL INSTRUMENT ELECTRICAL CIRCUITAll OKProblems metOperation

Check:

  • connection between engine coolant temperature sender unit and central instrument
  • service fuse
  • ignition-operated service fuse
  • central instrument power supply
  • central instrument earth
( See   E4023  DASHBOARD CENTRE AUXILIARY EQUIPMENT() ). 		Continue to Step 2 Component defectiveReplace the component involved (if a fuse is involved, search for the cause of the problem)
Connections brokenRestore the connections (
2CHECKING TEMPERATURE SENDER UNITAll OKProblems metOperation
1.6 TS 1.8 TS [d] 2.5 V6Checking operation of engine coolant temperature sender unit Continue to Step 3 Sender unit defective Replace sender unit Op. 1088E24
1.9 JTD 8v 2.4 JTD 10vCheck that the engine coolant temperature sender unit is working properly: Continue to Step 3 Sender unit defective Change the sender unti Op. 1088E34
3CHECKING THE CENTRAL INSTRUMENTAll OKProblems metOperation
Check the central instrument is working properly, particularly the engine coolant temperature signal check device see DESCRIPTION AND OPERATION: 5560 INSTRUMENT PANEL Continue to Step 4 Device not working Replace the central instrument Op.   5560C51 
4CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'