How do I test cts wiring?
05-06-2009, 07:32 PM
#1
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
How do I test cts wiring?
How can I verify the wiring to my coolant temp sensor is working properly?
05-07-2009, 11:20 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
OIL's WELL
Obtain a rheostat of approximately 2KΩ.
Remove the connection at the CTS.
Connect the rheostat from the wire to ground.
Adjust the rheostat back and forth.
If your wiring is OK you will observe the temperature indicating full hot to full cold.
Happy Racing!
If People Drove Any Slower They’d Be Going BackwardsFog lights are not driving lights. Keep em turned off slow pokes.
How bout those dorks too scared to drive without headlights on in the daytime!
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Last edited by NINÅ; 05-07-2009 at 11:34 AM.
05-07-2009, 12:27 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: OIL's WELL
Obtain a rheostat of approximately 2KΩ.
Remove the connection at the CTS.
Connect the rheostat from the wire to ground.
Adjust the rheostat back and forth.
If your wiring is OK you will observe the temperature indicating full hot to full cold.
Happy Racing!
If People Drove Any Slower They’d Be Going BackwardsFog lights are not driving lights. Keep em turned off slow pokes.
How bout those dorks too scared to drive without headlights on in the daytime!
.
.
05-08-2009, 03:56 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: How do I test cts wiring?
Fan not switching on and a nice bog off idle, I had the same problem not long ago and a new CTS fixed it up.. the only thing I've done since than is replace the intake gaskets due to a leak at the rear china wall.. since putting it back togather my problem is back. The voltage at A + B with the sensor disconnected is 5.17vdc. With the sensor connected it does slowly go down but not enough, at roughly 240 degrees it shows a voltage of 1.20 vdc... can anyone point me in the right direction???
05-08-2009, 04:29 PM
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Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: How do I test cts wiring?
Unplug the ECM and do a continuity test from the connector pins to the ECM
Reference
http://chevythunder.com/
Reference
http://chevythunder.com/
05-08-2009, 04:36 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: How do I test cts wiring?
Unplug the ECM and do a continuity test from the connector pins to the ECM
Reference
http://chevythunder.com/
Reference
http://chevythunder.com/
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05-08-2009, 04:58 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: How do I test cts wiring?
Well I tested c10 from the pcm harness end to the connector end at the sensor, .4 ohms on the 200 ohm scale. What should this wire ohm out at? I just looked at the provided link again, I see that b6 is the ground.. I'll check that tomorrow..
Last edited by 89RsPower!; 05-08-2009 at 05:40 PM.
05-08-2009, 10:25 PM
#9
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Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: How do I test cts wiring?
.4 ohms is barely anything. That means the signal wire is not your problem
If your ground comes back similar resistance (0-1 ohms) then wiring is out of the picture
If your ground comes back similar resistance (0-1 ohms) then wiring is out of the picture
05-08-2009, 10:31 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: How do I test cts wiring?
so basically if the ground checks out I'm left with the ecu? Or 2 bad cts's..
Last edited by 89RsPower!; 05-08-2009 at 11:04 PM.
05-09-2009, 12:57 AM
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Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
Re: How do I test cts wiring?
22 guage stranded wire is typical .01495 ohms per foot, 8ft would be less then .12 ohm. 1 ohm would be way to high for even a 25ft length of 22 guage wire.
05-09-2009, 01:09 AM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: How do I test cts wiring?
On another note does anyone know how the test the cts with corrosponding voltage values for temps with the wires connected?
Is there a way to test just the sensor itself with out the wires hooked up via ohm meter?
05-09-2009, 12:50 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: How do I test cts wiring?
Well I'm guessing its my pcm/ecu... both wires ohm out exactly the same at .4 ohms, source voltage is sometimes 5v on the dot and sometimes its 5.6 or higher.. when watching the voltage readings as the car heated up they started at 2, slowly went down and when they were about to go to below 1v they suddenly jumped to over 3.5v and started going up.. same thing with 3 diff cts's I had laying around.. I guess I'll be making a trip to the boneyard to grab a pcm.. anyone know what years and models of cars are compatable? Does it have to be from a tpi car? I'm assuming its p/n #1227165.. are there any other p/n's that will work?
Last edited by 89RsPower!; 05-09-2009 at 12:56 PM.
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