Code 21- Fixed????

[fost9508]

Hey guys, I just removed the ECT (on the passanger side ) and reinstalled it checked the temp on the coolant, gauged at around 162 deg F. I measure the voltage out of the sensor and it measured at about .82 volts, which seems about right for that temp. Anyway, reinstalled it and now the code went away. This doesn't make any sense to me. Explaination please

Thanks in advance..

 

[mozpony]

You might have fixed just by removing and reinstalling the plug .Bad or dirty connection ?

 

[HISSIN50]

i still might check it some more - though i dont have a table in front of me to know if your value seems right (somehow it seems high, but i have nothing to base that on) - your sensor may not be tossing a code, but still might be out of calibration (within absolute specs but not correct for the given situation).
i think you did good - im just tossing out stuff for down the line if problems reoccur.

nice work.

 

[fost9508]

Hissin,

Here is the table I used....Posted by jrichker, I didn't interpolated the voltage but it is aleast between the two know temp/voltage values.....dunno????

Hissin....not to hassle you to much, but I posted earlier about Code 94 and 44 ....post title something like Code 44 and 94 Update....could you read through it to see if you have any ideas?

Thanks


Code 21 – ECT sensor out of range. Broken or damaged wiring, bad ECT sensor. Note that that if the outside air temp is below 50 degrees F that the test for the ECT can be in error.

The ACT & ECT have the same thermistor, so the table values are the same

ACT & ECT test data:

Use Pin 46 on the computer for ground for both ECT & ACT to get most accurate readings.

Pin 7 on the computer - ECT signal in. at 176 degrees F it should be .80 volts

Pin 25 on the computer - ACT signal in. at 50 degrees F it should be 3.5 volts. It is a good number if the ACT is mounted in the inlet airbox. If it is mounted in the lower intake manifold, the voltage readings will be lower because of the heat transfer.

Voltages may be measured across the ECT/ACT by probing the connector from the rear. Use care in doing it so that you don't damage the wiring or connector.

Here's the table :

68 degrees F = 3.02 v
86 degrees F = 2.62 v
104 degrees F = 2.16 v
122 degrees F = 1.72 v
140 degrees F = 1.35 v
158 degrees F = 1.04 v
176 degrees F = .80 v
194 degrees F = .61

 

[HISSIN50]

Hissin,

Here is the table I used....Posted by jrichker, I didn't interpolated the voltage but it is aleast between the two know temp/voltage values.....dunno????

Hissin....not to hassle you to much, but I posted earlier about Code 94 and 44 ....post title something like Code 44 and 94 Update....could you read through it to see if you have any ideas?

Thanks


Code 21 – ECT sensor out of range. Broken or damaged wiring, bad ECT sensor. Note that that if the outside air temp is below 50 degrees F that the test for the ECT can be in error.

The ACT & ECT have the same thermistor, so the table values are the same

ACT & ECT test data:

Use Pin 46 on the computer for ground for both ECT & ACT to get most accurate readings.

Pin 7 on the computer - ECT signal in. at 176 degrees F it should be .80 volts

Pin 25 on the computer - ACT signal in. at 50 degrees F it should be 3.5 volts. It is a good number if the ACT is mounted in the inlet airbox. If it is mounted in the lower intake manifold, the voltage readings will be lower because of the heat transfer.

Voltages may be measured across the ECT/ACT by probing the connector from the rear. Use care in doing it so that you don't damage the wiring or connector.

Here's the table :

68 degrees F = 3.02 v
86 degrees F = 2.62 v
104 degrees F = 2.16 v
122 degrees F = 1.72 v
140 degrees F = 1.35 v
158 degrees F = 1.04 v
176 degrees F = .80 v
194 degrees F = .61

ok gotcha. sounds good (I knew i was not confident in knowing if that number was off, hence my saying so above. ). i think i recall a chart for ACT values (which as you know, are the same as ECT). however, the ACT chart did not go high enough in temps for your numbers (ambient temps seldom exceed 110*F - and if they do, you are in trouble. ).

i saw your other thread and Mario posted a really nice response - more eloquent than i could have put it.

 

[Mustang5L5]

An ECT sensor is $25 or so from a parts store. Why not just replace it and be done with it??

 

[HISSIN50]

An ECT sensor is $25 or so from a parts store. Why not just replace it and be done with it??

Mike, stop with all this logical thinking - it takes away half the fun of the threads.

you are correct of course. we are like cats; we like to play with the stuff before we toss it and get new stuff.

 

[Mustang5L5]

Mike, stop with all this logical thinking - it takes away half the fun of the threads.

you are correct of course. we are like cats; we like to play with the stuff before we toss it and get new stuff.

Well my time is valuable these days. I just get right down to the point.