Help me decipher Codes for my sc :O)

XxSlowpokexX

Registered User
Ok finally my car (94 sc automatic)did the christmass tree thing again and I hooked up the good ol trusty MATCO scanner,,Here's what I got.

Stored codes were 176 I believe bank 1 lean
and 543 Secondary fuel pump circuit

Now I believe 176 refers to a bad o2 possably but what about 543?...help?

Also when doing the engine run test when it asks to blip throttle and al that crap I got a 136 which was lean bank 2
and a 225 which I think was knock sensor..Which is brand new however in this heat and humidity with my boost I'd assume it would go off..


So basically change O2's and????....Any idea guys


Thanks ..Damon
 
543 is "Fuel Pump (FP) circuit open connection - Electronic Control Assembly (ECA) to battery".

Maybe you're getting lean codes because the fuel pump isn't getting enough juice.

I'd check all the fuel pump wiring if it were me.
 
Last edited:
I could also be running lean because I have stock injectors and 21 psi...Anyopne else have any ideas before I go ripping through it?
 
Fuel Pressure

Key on - 35-45
@ Idle 30-45 Vacuum Hose attached to reg.
@ Idle 40-50 Vacuum Hose detached to reg.
Hold pressure after 5 min. 30-40
max pressure 65


ck. voltage @ fuel pump relay to pump location #4 pink/ black wire
 
code 176 / 543

Let me know what you find. We are trying to trace down wiring problems on a friend of mines '92 sc. code 176 / 212/ 542:rolleyes:
 
Back
Top