1*P0135 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction code 1

2*P0141 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction code 2

3*P1337 Engine Speed (RPM) Fluctuation Sensor No Signal

4*P1508 Idle Air Control Valve (IACV) Circuit Malfunction
p0450 code 14

5*p0450-??? fuel tank pressure sensor
1&2- I think all i need is two new 02 sensors. could be a simple fuse
3- repin or rewire something??
4- rewire iacv...low ilde 500-1000rpm
5- repin or rewire

stats-97 dx hatch, 98 ls ecu, no cat(just ordered a hi flow cat last nite), only 1 02 senor is installed


Modified by jazz1320 at 12:52 AM 4/25/2005


Modified by jazz1320 at 6:14 PM 5/2/2005


Modified by jazz1320 at 4:29 AM 5/17/2005

 

96 dx b20

 

bump

 

hmm ok..
I"m guessing you reused your DX harness on the B20 engine, right? if so, the code 14 tells me you didnt perform the IACV fix which is explained in my OBD2a wiring diagram here:

http://www.ff-squad.com/tech/w...8.jpg
and
http://www.ff-squad.com/tech/w...g.jpg

Once you perform the IACV fix, code 14 will go away.

Btw, what ecu are you using to power the B20 engine?

 

p75

 

What year P75? Are you using a conversion harness?

P0450 has got to do with the EVAP system - fuel tank pressure sensor and all that jazz.

Did you do the IACV fix as described by Katman's site?

Don't be so quick to replace the O2 sensors. Since the codes are indicating the heaters are bad, you may have a blown fuse since both heaters are serviced by the same +12v feed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">What year P75? Are you using a conversion harness?

P0450 has got to do with the EVAP system - fuel tank pressure sensor and all that jazz.

Did you do the IACV fix as described by Katman's site?

Don't be so quick to replace the O2 sensors. Since the codes are indicating the heaters are bad, you may have a blown fuse since both heaters are serviced by the same +12v feed.</TD></TR></TABLE>

96-98 p75 no convo harness

what do u mean heater? i will check my fused under the hood, but i know i need a o2 sensor b/c i only have one!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">
Did you do the IACV fix as described by Katman's site?
.</TD></TR></TABLE> im going to let my boy do it, hes the man with wires!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">

Don't be so quick to replace the O2 sensors. Since the codes are indicating the heaters are bad, you may have a blown fuse since both heaters are serviced by the same +12v feed.</TD></TR></TABLE> where is the fuse?

 

bump

 

where is the fuse?

 

bump

 

i just got a new fi flow cat from my brother

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jazz1320 &raquo;</TD></TR><TR><TD CLASS="quote">i just got a new fi flow cat from my brother</TD></TR></TABLE>

Hot damn!

Now you just need to get a Helms Manual and you're set...

The answer you're looking for can be found in it [Helms], but I'll help you out just this once because I know you went ahead and ordered one for yourself.

The fuse is in the under-dash fuse/relay box. It is Fuse 15: Alternator SP - 15A.

 

wouldnt that mean my Alternator is bad then???

 

No - if the fuse is busted though, it means your alternator probably isn't charging.

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">

Don't be so quick to replace the O2 sensors. Since the codes are indicating the heaters are bad, you may have a blown fuse since both heaters are serviced by the same +12v feed.</TD></TR></TABLE> can u explain???????

 

I thought you ordered a Helms...

The ECU needs a way of making sure the heater elements have not burned out inside the O2 sensors. So inside the ECU itself, there is a circuit that senses when current is being pulled by the heater element. If no current if being pulled, then either the heater element has opened up (which you can test with a multi-meter), some its wires have become open (which you can test with a multi-meter), or the fuse that supplies power to them has burned up (again, multi-meter).

You need a meter and you need a Helms, period.

 

the cause for the 3-4 diff codes you have and the blown #15 fuse is probably being caused by a wire that has been worn through the insulation and grounding out. it is located under the intake manifold and is rubbing on the brace between the manf. and the block

 

i rewired the ivac under my hood.. do i have to remove the ornage wire from the ecu or can i just cut it?

 

Once you've rewired the IACV, the orange wire can either be cut at the ECU connector or tapped off. I'd go with the taped off method in case you ever have to go back to a 3-wire setup.