NC_jdmeg

I was throwing code 22 for vtec oil pressure switch, the plug broke off of it in motor swap, anyway did the wire between a4 and d6 and made the code go away but going down the road after 5k it pops cel when vtec should kick on and puts car in limp mode, turn car off and back on cel is gone, any idea how to stop this? Should I unplug vtec solenoid too?

Former User

Pull the code.

NC_jdmeg

Evetytime I turn the ignition switch the code is gone

Former User

Click the Codes link in my signature. The solution is to leave the engine running.

What engine?

NC_jdmeg

D15b vtec its the map code need a new 3 bar I guess

Former User

Code 3 or 5?

92ehatch

If the code disappears after engine shut off it may mean a blown 7.5 amp backup fuse under the hood.

If you swapped the engine in to a car with the map sensor harness mounted to the firewall you must use that map sensor wire and not the engine harness map connector. i think some of the dx if not all used a firewall mount.

NC_jdmeg

Yea it is 3, and I had to re wire map sensor wires because it was the firewall one and it wouldnt work with the one from engine harness

Former User

What engine swap and ECU? If there's a MAP sensor on the throttle body, you need to use that one.

92ehatch

important on engine and ecu but the chassis with firewall mounted maps must use the wiring from the original because it is attached straight to the inside wiring harness.

rather on a stock z6 (ex or si) it is attached to the engine harness

if you swap a z6 into a stock dx with firewall mounted map sensor and use the z6 engine harness plug on the map sensor it will throw a code 3 (i speak from experience)

but back to basics, without his swap/chassis info we dont know.

although he did say he had to rewire it due to the firewall mount. without further info, i would say he needs to check the wiring.

NotARaCist

iTrader: (1)

I'm curious why OP immediately said he needed a 3 BAR MAP sensor...is there something about this car you aren't telling us? You shouldn't need a 3 BAR.

Former User

I don't follow your reasoning. The firewall mounted D15B7 MAP sensor and TB mounted D16Z6 MAP sensor are pinned identically to the ECU, so the firewall wires can be used for the TB MAP sensor without throwing code 3.

From the service manual:

92ehatch

Hmmm. The last swap i did (my first) the ecu would throw a code 3 when i used the engine harness but not when i used the firewall mounted harness.

I guess it is possible the wiring was broken to one ...the diagram you posted does show them merging together inside.

Looks as if i am incorrect. But still does not rule out a wiring issue for the OP. thanks ron

Op disregard my previous post (s)

NC_jdmeg

Sorry yes the car is boosted, but never had this problem until recently, I pulled the motor from my old wrecked car that had firewall mounted map sensor and just re wired it for tb map, only problem I can see is map sensor finally took a crap, and need upgrade

NC_jdmeg

Its a d15b vtec and ecu is p28 chipped

NotARaCist

iTrader: (1)

That's not how MAP sensors work. You don't just slap a 3 BAR on there and call it an upgrade. A larger MAP sensor requires a re-tune, and how much boost you run dictates what size MAP you run. If you're running under 13 PSI, you don't need a larger MAP, period.