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/
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