I have owned my 2004 Laguna !! 2.0 Expression for 6 years. For the first 4 years it gave no trouble but since then it has been plagued by an erratic temperature signal. The car has been checked over by two dealers and three other specialist workshops with no resolution but a lot of cost!
The temp gauge began to move steadily down from its usual position just below half to a quarter, even though it was obvious that the actual engine temp wasn't changing. It would then drift back up to normal sometimes. As time has gone on without a solution, the probability of normal operation has fallen from .95 to .05. On a cold morning (say 2 degrees C) the car is almost impossible to start, suggesting that the ECU is receiving an incorrectly high temp signal and sets the fuel/air mixture too lean. The temp sensor has been replaced, as has the thermostat; all the wiring connections have been checked several times; the car has been checked with the factory Clip diagnostic tool and at least two others with no fault signal showing up; and the instrument cluster has been removed and thoroughly checked. I don't have a wiring diagram for the car but it seems that the voltage output from the temp sensor (which I know is tracking correctly) goes to the ECU ( a Sagen in this car) and from there to the temp gauge. I suspect erratic behaviour of circuitry inside the ECU, but in Australia nobody knows enough about this ECU to test it.
Can anybody help? I love the car but if I can't fix this problem it's almost useless.
The temp gauge began to move steadily down from its usual position just below half to a quarter, even though it was obvious that the actual engine temp wasn't changing. It would then drift back up to normal sometimes. As time has gone on without a solution, the probability of normal operation has fallen from .95 to .05. On a cold morning (say 2 degrees C) the car is almost impossible to start, suggesting that the ECU is receiving an incorrectly high temp signal and sets the fuel/air mixture too lean. The temp sensor has been replaced, as has the thermostat; all the wiring connections have been checked several times; the car has been checked with the factory Clip diagnostic tool and at least two others with no fault signal showing up; and the instrument cluster has been removed and thoroughly checked. I don't have a wiring diagram for the car but it seems that the voltage output from the temp sensor (which I know is tracking correctly) goes to the ECU ( a Sagen in this car) and from there to the temp gauge. I suspect erratic behaviour of circuitry inside the ECU, but in Australia nobody knows enough about this ECU to test it.
Can anybody help? I love the car but if I can't fix this problem it's almost useless.
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