Help ! I need guidance!

My truck, a 91 4runner 22re Std, has been acting up;

Poor drivability from about 1800 to 2500 RPM, looses power, worse when the engine is at normal temps.

Pulled codes and got 24 and 31. I pulled the ECU fuse and drove it again and got the same codes.

24 = Intake air temp Sensor Signal
- open or short in intake air temp sensor
1 - Intake air temp circuit
2 – Intake Air temp sensor
3 – ECU

31 = Manifold and or Airflow meter sensor signal circuit
1- airflow meter circuit
2- manifold pressure/circuit
3- ECU

With the stock AFM I cleaned the contacts and tested the air temp sensor, had normal resistance values. Also checked the wires inside the boot that covers the back of the AFM connector.

Got a used 82 supra afm, plug and play mod for the 22re 4Runners. Same problems.

I plan on checking the resistance values for the rest of the AFM and checking the connections at the ECU.

The common between the two codes is the ECU, from everything I’ve read, the ECU very very rarely goes.

Sorry for the book, but, where should I go from here?

 

Do you have a ground wire unhooked?Check em all or run some new ones.Cant have too many.What did you clean the AFM with?It's probly ruined!Has any one ever adjusted it?
Bigblock

 

I only cleaned the connectors with contact cleaner, nothing inside.

I'll check my grounds as well.

Any other ideas?

 

Got er fixed !!!

Was the ECU. Swapped it out and I'm back in action !

Thanks for your help

 

ouch i was going to say maybe the AFM as i just did mine i hope its better i dont have money for a ecu lol

 

I'd check for vacuum leaks. I've got an '86 and there is differences in the ECU many of the sensors rely on vacuum to trigger another mechanism to work and the sensor is also tied into the computer. IE the EGR valve. In open loop (cold) it does not operate but does in closed loop (warm). There is a peice of vacuum tubing that goes from the EGR pipe off the head (but before the valve) this tube runs to the valve or modulator (forget which) so when the EGR opens unaccounted for air enters into the intake. This is one example.

As I understand it, the trouble codes point to a system but are diagnostic tool you need to understand how they relate to narrow down the problem (i'm still working on this process myself).

 

PM sent Luc, you can borrow my FSM is you want.