DTC 024 - Intake Air Temp Sensor (1 Viewer)

[UWdave]

Every once in a while I get a CEL. Before it used to happen on cold mornings, yesterday it happened while driving down the freeway on a warm day. When I check it after the fact, I get DTC 024. "Intake Air temperature sensor open or short"

Every time I check the sensor, it reads normal. Buzzing out the wires to the ECU is much more difficult and I haven't tried yet.

1) Besides being a nuisance, does the engine go into 'open loop' or just run a little rich?
2) What are the odds that it is the sensor itself? Does anybody know the average junk yard price?

Thanks,
Dave

 

[TDavidson]

If you have a 93 it may be the ECU. Early 93s had a defective one. You can replace it in 5 minutes with one out of a 94. Search 60221. If you find one let me know. I have the same problem.

 

[UWdave]

My '93 is a 'federal model' so I'm thinking a '94 ECU will cause me some problems.

Federal model = No EGR temp sensor & no after cat o2 sensor

 

[BlackLS1]

My '93 is a 'federal model' so I'm thinking a '94 ECU will cause me some problems.

Federal model = No EGR temp sensor & no after cat o2 sensor

there is federal versions of the 94 model too. mine is a 94 with no egr temp sensor

 

[UWdave]

there is federal versions of the 94 model too. mine is a 94 with no egr temp sensor

You wouldn't happen to know the part number would you?

 

[BlackLS1]

sorry man i dont have it on hand. im sure Cdan can help out on that?

 

[UWdave]

Yeah. I value Cdan, so I try to make bothering him a last resort.

I've found this on several threads:

The one you want is 89661-60221.

89660-60220 is the early California spec ECU. Both it and the 89661-60170 (early 49 state) are replaced by the 89661-60221.

 

[UWdave]

I found the quote from Cdan himself. Apparently the magical ECU can work with Federal and Cali trucks:

https://forum.ih8mud.com/80-series-tech/17681-bad-ecu-maf-cel-twist.html

Early federal 93's (til May 93) have an 89661-60170 and early California 93's have an 89661-60220. Both of those are replaced by an 89661-60221 which is also used in all 94's.

The 60170 and the 60220 are the ones that are prone to the 83, 84, 85 TCM/ECM communications DTC codes.

 

[TDavidson]

Check out:
http://www.cruiseryard.com/electrical-80/?sort=featured&page=2

$120.

 

[cruiserdan]

The 89661-60221 is discontinued so the only source is used.

The price was wild anyway. The last published list price on that item was $1,872.83.