I've got an 88 4 Runner with a new 22RE, maybe 15,000 miles that recently overheated due to a stuck thermostat and now my check engine light comes on almost always. The codes read 22- water temp sensor, 24- intake air temp circuit fault, 31- air flow meter circuit fault, 42 vehicle speed sensor circuit fault, and finally 71-EGR system fault. Does anybody have any idea how to check these systems individually or correct any of this. Any advice would be greatly appreciated....... shop wants $400 to run tests. Thanks for your time...........TIM

 

Try this link. It is an online FSM for 1993 yota Trucks. http://www.personal.utulsa.edu/~nathan-buchanan/93fsm/



Probably just need to clear the codes. Disconnecting battery( 1 min.) is the easiest but you lose memory on radio etc.
If clearing codes doesn't work then this manual will show you haw to test all your sensors.pretty straightforward.

 

sounds like there maybe a loose ground wire somewhere?

 

what year is it?

 

Thanks guys.....It's an 88 and I'll try some of those tricks when I put the Marlin tranny and transfer in it in a couple weeks........TIM Any more ideas greatly appreciated........