Error code 89 - 2005 Chevrolet Aveo Sedan

the lamp means 2 things CEL (SES/MIL)
it means there is a serious problem.
it means get car service
if frisky? it means DIY scan the pCM and check all fuses.
SES lamp is what some makers of cars call the CEL
it means exactly the same thing.
lost the glove box free users guide it tells you all this.
not many 89 cars on the road now, most are dead
and repairs exceed its value (won't stop me but, most end here)

89 Chevy Cheyenne C1500 pickup truck,.
no engine told. generation 4 truck.
4 engines then, 4.3v6,5.0v8,5.7v8 , 6.2Ldiesel-v8

finding 1989 manuals is hard, only paper manuals then no PDF or others doing horrible scans later,
the problem is this cars ECU/ECM/PCM is chevy OBD1 system and there are flash codes (cel /ses ) blink codes for error huge.
if the CEL glows it means 99% of time a major error
like dead sensor , 100% dead,
4.3L has distributor and horrors of TB throttle body injection TBI. not MPI we have now.
5.0 same thing
5.7 -same
diesel ? ask. rare option. for sure running at all.

gasoline engine surge has many causes
i will list some only
spark bad.
fuel injectors messed up. 2 there are.
fuel pressure out of spec, FPR bad.
IAC DEAD OR JUST DIRTY.

NOW THE FLASH CODE OBD1 MAGIC
jUMP ALDL , PIN A TO B.

https://mechanicbase.com/trouble-code/obd1-codes/

where did you see this code, where or eyes looking at, ????
no year car told nor engine size there.
is this some 1995 or older car
is it in USA , our cars are totally different.
or radio code or on cluster error or ECU LED errors. for 1988
lots of thins can produce errors, on cars..

This would be handled with
'year make model code 89' instead of trying to guess what your engine is in?

https://www.auto-manual.com/fault-codes/error-codes-toyota/

https://www.google.com/search?q=Toyota+1JZ-FSE+Flash+code+89

https://www.google.com/search?q=1jz+fse

It is in there somewhere. 'year make model' should be in all questions in the vehicle categories.

Add

year make model
to this search query. It is conflicting between alternator and thermostat.

https://www.google.com/search?q=check+engine+fault+code+89

For future reference all questions on Fixya for vehicle help should have year make and model in the header Like

2008 Toyota Supra GT 3000
Engine check light error code 89. What causes this and how to fix please?

..

On yours code 89 is often triggered by a bad thermostat good luck colin

Here is a jeep forum on code 89


https://www.jeepforum.com/forum/f11/code-89-overdrive-problems-600219/

code 89 means your car is due for a service , not an error code but a message code

Only you apparently know what car that is

Google your codes & read up

Type: OBD & the code

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TDC (Top Dead Center) position/crank angle sensor or circuit Problem. That's what Honda calls it. Part stores will call it a CRANK POSITION SENSOR. P.S. The Sensor itself is probably going bad.