codes 34 and 21

colinm5

colinm5

New member
Re: codes 34 and 21

Here ya go - http://www.sportmachines.com/maintenance/aldl.php

21 - Throttle position sensor/
voltage high Check for a sticking or misadjusted TPS plunger. Check all wiring and connections between the TPS and the ECM. Adjust or replace the TPS. (see other instructions on doing this)

34 - Vacuum sensor or
MAP sensor This will set when the signal voltage from the MAP sensor is too low. Instead the ECM will substitute a fixed MAP value and use the TPS to control fuel delivery. Replace the MAP sensor.
 
Last edited:
gjp

gjp

another post whore
Re: codes 34 and 21

Thanks but I showed him that. He knows what codes they are. It just sounds weird that both codes would come up the same time. I was thinking grounds, but I thought the map and o2 shared a ground circuit and not the map and TSP. I dont have the paperwork in front of me right now??
 
B

blktyphoon

93 ty
Re: codes 34 and 21

colinm5 said:
Here ya go - http://www.sportmachines.com/maintenance/aldl.php

21 - Throttle position sensor/
voltage high Check for a sticking or misadjusted TPS plunger. Check all wiring and connections between the TPS and the ECM. Adjust or replace the TPS. (see other instructions on doing this)

34 - Vacuum sensor or
MAP sensor This will set when the signal voltage from the MAP sensor is too low. Instead the ECM will substitute a fixed MAP value and use the TPS to control fuel delivery. Replace the MAP sensor.
Click to expand...
hooooooly crap thats a lot of stuff to remember i got a lot of studying to do thanks this looks like what i need.
 
B

blktyphoon

93 ty
Re: codes 34 and 21

gjp said:
Thanks but I showed him that. He knows what codes they are. It just sounds weird that both codes would come up the same time. I was thinking grounds, but I thought the map and o2 shared a ground circuit and not the map and TSP. I dont have the paperwork in front of me right now??
Click to expand...
thanks also im gunna study this and get dm down.
 
gjp

gjp

another post whore
Re: codes 34 and 21

oh. Sorry I sent you another link. I thought it was that one. I have so many saved on my computer.
 
B

blktyphoon

93 ty
Re: codes 34 and 21

gjp said:
oh. Sorry I sent you another link. I thought it was that one. I have so many saved on my computer.
Click to expand...
send me everything you got i can always know more about my truck
 
Flyin Ryan

Flyin Ryan

hated cuz he drives fords
Re: codes 34 and 21

Just for the hell of it unplug your ecm b fuse for a few minutes to reset the ecm.. maybe the codes are older and no longer an issue.. if they come back after driving for a little bit then you know you have work a head of you for sure then
 
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