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I'm Not Dead! But need help with error code 15
Topic Started: Apr 26 2012, 06:20 PM (471 Views)
Joebafett
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Hello fellow Sheeple!

Just before I was about to consign my 95 to the flames of failure, a friend came along from my unit, and helped me resurrect the geo. Amazing what a stuck crank case breather will do for your power. Now she drives, however there is one problem remaining - error code 15: Coolant Temp Sensor. Now what I do know, is that the CTS has been replaced, yet I cannot clear this error. This is the only thing preventing my geo from being able to pass a texas state inspection. Any suggestions?
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Bad Bent
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Facetious Educated Donkey

Disconnecting the battery for a few hours and touching the positive and negative cables together usually clears the ram.

You want to test the sensor by sticking it in a pail of water on a stove, with a thermometer, and testing the resistance as the water temperature increases. System Components/Sensors Suzuki Swift From: http://sites.google.com/site/suzukiswiftinfo/ See page 2.

You will have to drain the coolant so you might as well clean the two coolant tubes on the Throttle Body and make sure the CTS is clean. If it is reading correctly then it may be a wiring issue as in corroded, broken or even misconnected wires.

Deg. F - ohms
210 -- 190
160 -- 400
100 -- 1250
70 -- 2350
39 -- 4780
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mwebb
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FOG

never use an ohm meter when working on broken cars
unless you are testing the terminating resistor values on a hi speed CAN Network
Geo Metros do not have hi speed CAN networks

2 pins
1 is ground , measured from battery negative must be 50mv or .050 volts or less
engine running , high beams on heater blower maxed

1 is 5 volt s
drops as the engine heats up , should begin around 4 volts with engine cold and with engine hot around .5 volts
this is the signal the ECM sees and uses to calculate coolant temp
****a voltage drop on the ground side raises signal voltage by the amount of the voltage drop , a bad ground will enable the ECM to believe the engine is cold when it is Hot*****

Mr ECM does not see "ohms" or resistance , Mr ECM sees voltage , test the circuit by looking at what the ECM sees
not what the book thinks you should see
the book is wrong , the circuit voltages are what matter , the "ohms" of the sensor may test to match the graph but if there is a problem in the circuit , the "ohms" test will never find it

believe the "ohm Meter" and you will be chasing your own butt without ever catching it , humorous to watch , very frustrating to experience.

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