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Volvo Penta 57 GXIC

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mikev324

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"I'm ready to jump overboa

"I'm ready to jump overboard!!! Replaced the temperature gauge, sending sensor at water pump...still no temperature reading on the gauge!! 12V at gauge...Whats next?? are there other temp sensors???"
 
"I would check the wiring betw

"I would check the wiring between the gauge and the sensor, and also make sure the gauge is grounded."
 
Ok going down to boat tomorrow

Ok going down to boat tomorrow...I have power to the gauge so i am assuming that means it's grounded right? I'm thinking i should replace the 2 sensors on the manifold first and then go from there if it doesn't work. We'll see what happens!!
 
"one more time.....Grrrr

Th

"one more time.....Grrrr

There are four wires to the temp gauge..
+12 volts for sensor/gauge
+12 volts via switch for gauge lamp
Ground...for light only!
lead to the sensor.

I find its easiest to troubleshoot something if you understand how it works. The temp gauge (as well as the oil pressure and fuel) are really ammeters...i.e., they measure the current in the sensor circuit. The higher the reading, the higher the current.

The sensor itself is just a variable resistor wired internally between the "connector" on top to the brass screwin... So when the sensor is screwed in, its grounded.

Assuming that you have +12 at the gauge, the next step is to measure the voltage at the sensor with the wire off ( easier to do)
If you do not have a multimeter, either buy one or go to you local auto parts store and buy a "12 volt tester"... which is just a 12 volt bulb in a plastic widgy with two leads.

With the ignition on... check the voltage between the end of the disconnected wire and the engine block... You should see pretty much 12 volts...or the bulb should light brightly... If using the bulb thingy, check it out across the battery first so you can see what full brightness is. You won't get quite that when you measure check the wire.

If you don't get any voltage there, start checking back towards the meter, something is amis in the wiring... If the engine is connectorized, there may be funny business in the connector or wiring for that circuit."
 
"mike, you are correct there a

"mike, you are correct there are two sensors. One sends info to the ECU and the other feeds info to the gauge. Check the color of the wire (not the ground or the light) on your gauge, on mine it is beige with black stripe. Find the sensor with the same color wire, that may be located on the intake manifold close to the thermostat. Either of the sensors (ECU/gauge) may be defective, however only one controls the gauge. If you are reading zero on the gauge I would inspect and or replace the gauge sensor. Check the wiring of course before replacing it. If you have a wiring diagram it will tell you the color of the wire to the gauge."
 
Thanks guys...gonna see what I

Thanks guys...gonna see what I can do...I think I'm giving up and gonna find a mechanic!! Anybody know of a good one on the South Shore of Long Island...Nassau County??? Freeport to be exact
 
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