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95 Geo Metro dies while driving
Topic Started: Sep 27 2017, 01:23 PM (3,429 Views)
freegeo
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clc
Nov 4 2017, 10:13 AM
The light green wire measured 5V. The black and blue I did not get a reading.
I also tried the suggestion from Metromightymouse above and disconnected the ISC after it reached temp and it ran just the same. Idle at 600.
I checked the codes and got
23--IAT...Intake Air temperature Sensor circuit – High Voltage Input. Low temperature indicated.
46--Idle Speed Control Motor circuit.
then you reference voltage is good.

Quote:
 
The black and blue I did not get a reading.

Was the reading just zero? That is what it should be. Could you try it again and when checking the voltage, open the throttle and see if it goes to 5 volts.


Quote:
 
I checked the codes and got
23--IAT...Intake Air temperature Sensor circuit – High Voltage Input. Low temperature indicated.
46--Idle Speed Control Motor circuit.


Was the codes checked after the ISC was unplugged? with it unplugged it would cause the ecm to set a code.

The IAT can be checked. Look in the 94 fsm. 6E2-A2-42 DRIVEABILITY AND EMISSIONS 1.0L (VIN 6) (UPGRADED) Page 42 shows the procedure for checking the IAT.


Have you checked the grounds from the computer to the engine?
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Metromightymouse
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Powdercoat Wizard

46 is expected. The surging may quit since the ECU can no longer use the ISC to drive the throttle plate open. You do loose the morning choke so you have do use the throttle pedal to feed it more gas until it warms up and your idle may drop low under high electrical load. I drove like that for quite a while and then I modified the ISC to work with a switch and button on the dash so I could control it as a manual choke.
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clc
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[ *  *  * ]
The codes were checked with the ISC connected.
The bck/blu wire measured .05- .07V when the throttle was maxed.
ITA-- There was continuity and 4.98V at the #2 wire.
There was 1750 Ohms at the sensor at about 75 degrees(room temp)
Codes 23 and 25 both showed.
I used contact cleaner for the connection.
I need to check the connection at the ECM, but don't know how to go about it.
Don't know how to check the ground at the ECM either.
Edited by clc, Nov 4 2017, 04:14 PM.
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freegeo
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When you got .05 -.07 volts on the black/blue wire, what was the setting on your volt meter? 20, 200? It will make a difference of what the reading is.
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clc
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Set at 20.
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clc
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Is there an idle speed control relay in this car?
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freegeo
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clc
Nov 4 2017, 04:29 PM
Is there an idle speed control relay in this car?
Yes I believe so.
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freegeo
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clc
Nov 4 2017, 04:22 PM
Set at 20.
If you had it set at 20 on your volt meter, you should have gotten 5 volts not .05. That needs checked into.
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freegeo
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I will try and check how the switch works on my ISC when I get home tonight. I'm sure if the throttle is open the black /blue wire should have 5 volts. I remember checking that with my scope.
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freegeo
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http://geometroforum.com/single/?p=3030276&t=8029874
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clc
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Does this mean that the ISC is bad and needs replacing?
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freegeo
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clc
Nov 4 2017, 09:06 PM
Does this mean that the ISC is bad and needs replacing?
Possibly. Let me do some checking on mine 1st.
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freegeo
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Let's double check something, I told you the wrong wire color to check earlier. The gray/green wire on the ISC connector should have 0 volts at idle and 5 volts off idle or open throttle. If you could rechecked that it would help. That will tell you if the idle switch is working or not.

The black blue wire will have zero volts with the throttle open or closed.
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clc
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I checked the voltage at the green/gray wire and the voltage was 6.25 at idle and at open throttle.
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freegeo
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clc
Nov 5 2017, 01:45 PM
I checked the voltage at the green/gray wire and the voltage was 6.25 at idle and at open throttle.

Was the radiator fan on at that time? That voltage is a reference voltage and should be right at 5 volts. At over 6 volts the engine won't run.
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