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Looking for the temperature sensor on my 1999 honda Odyssey because the temp gauge has been stuck on high since I bought it 4 months ago. What else could be the problem?

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  • Cars & Trucks Master
  • 20,706 Answers

USA answer, not in usa , ignore my post or post country?
it can only be 3 problems, alldata.com covers the simple tests.
1: bad sender (if scan tool shows ECT reads right, its not this)
2: bad wires (conns) ECU/pcm to gauge.
3:bad gauge.
see:
factory FSM or alldata.com.

here is your type system, its no longer independent like in older years
quote:
The coolant temperature information is conveyed to the instrument panel, through the PCM, from the Engine Coolant Temperature (ECT) gauge sending unit. To test the gauge sending unit, first test the gauge operation to make sure the problem is not in the gauge or gauge wiring.
end quote.

my guess ? bad connection to I/P gauge cluster (rear)
do this only after scanning (any scan tool works) the ECU OBD2 port to see if temperature is normal at the ECT but Guage lies.
that is it. only testing wires an gauge, works from this point.

Posted on Oct 16, 2013

  • _-__-___-_
    _-__-___-_ Oct 16, 2013

    this is not true, some guages return to zero and other float key off, and is not the sending unit if the scan tool shows ETC reading the right temp. I have the full FSM. this wast guessing.

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  • Cars & Trucks Expert
  • 225 Answers

Does the guage drop to zero or low when the car is shutoff? If not it is probably the gauge not the sending unit.

Posted on Oct 16, 2013

  • Jennifer Oct 18, 2013

    The gauge has never moved since I bought the van. The fans go on, but the gauge is just stuck on hot and does not move. My husband checked the sensors and said they are working fine. He feels it may be the cluster to the gauges. All gauges work except for the temperature gauge.

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You might need a new ECT - engine coolant temperature sensor. If it's not reading the correct coolant temperature it's not going to tell the fan to turn on when it should.

Is the check engine light illuminated? I'd bet the ECT needs replacement.

Posted on Dec 17, 2008

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Temp guage not working 1999 alero


One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

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