I used the schematic below to successfully alleviate the P0430 SES code I had been getting for months. It works just like the O2 simulator you can buy for 25$ at o2sim.com but for 1/4 of the price. I tested this circuit on a bread board first to make sure it works before I made a half a$$ed version on a proto board. I could have made it much smaller, but it was small enough to tuck inside my stock non-AE engine cover and pass a NY state inspection the other day.

Radio Shack Part List
------------------------------------------------------------------------
U1: LM555 # 276-1723 $1.49
D1: 5mm Red LED **MUST USE RED** # 276-209 $1.29
C1: 4.7µF Electrolytic Capacitor # 272-1012 $0.99
C2: 0.1µF Ceramic Disc Capacitor # 272-135 $1.29
C3: 47µF Electrolytic Capacitor # 272-1027 $1.19
R1:1K Ohm Resistor # 271-1321 $0.99**
R2: 2.2K Ohm Resistor #271-1325 $0.99**
R3: 100K Ohm Resistor # 271-1347 $0.99**
R4-5: 22K Ohm Resistor # 271-1339 $0.99**

**Resistors come in 5 packs.

The hook up is quite simple. I followed Puppmaster's O2 simulator installation howto except the photos in the howto show a Fed spec harness or an 5.5gen harness (I'm not sure) and the colors mentioned dont apply to the Cali specs. Below is a picture the Cali spec O2 harness with the both connectors labeled for the appropriate P0420/P0430 code which the connected sensor should throw.


Below is the finnish product all packaged up.

 

Nice innovation. Just as a word of clarification, my write-up was done based on my 2002, which is CALI spec, as are all other 2001-2003s. While the plastic connectors (which I used in my write-up) are a different color, the wire shrouds/harnesses are the same with the RED being for Bank 2 (front bank) and the WHITE for Bank 1 (rear bank). Regardless, the actual wires that the O2 sim is spliced into should be the same color too:

Black: Ground
White: Signal
Red/Yellow: Power
Red/Blue: Heater

NOTE - These are the wires BEFORE (from the connectors to the ECM) the connectors and not after (from the connectors to the O2 sensor). The wires after the connectors consist of black, grey, and 2 whites and these are a pain to deal with, IMO.

I'll edit my write-up to include both the color of the connector and the color of the harness. Hopefully, that'll minimize the confusion.

 

Just as a pictorial comparison here's a 2002-2003:


And your 2001:

Red and white go to the same respective banks, just the plastic connectors are different.

 

Wow, nice work there

for your electronics knowledge

 

Nice work, since you have 4 left of each resistor, wanna make me one?

 

Definetly a nice piece of work with the electronics.

Also there is a mechanical o2 fix that can be done. Go to pep boys and buy two spark plug anti-foulers. If my memory serves me correct take a 1/2 drill bit and drill out the excess material from the inside of them. Screw them together and secure with lock tight and install in your o2 bung. Screw your sensor back in and for $5 you have yourself an 02 fix. I currently have it installed on my 03 evolution with a test pipe and for 10+K miles no CEL.

But of course my evo is selling this week upcomming and I will be buying an 03 max this week.

 

Awesome job!

 

I've seen the WRX and VW guys do the same thing, but AFAIK no one has tried it on a Maxima yet. The main problem is that Maximas with headers can't do that because they typically don't have bungs for the secondaries, so bungs have to be welded in. It could probably work when someone just has a faulty pre-cat CEL though.

 

^ makes perfect sense to me! excellent point.

 

None of these pictures work for me. Does anyone have the pictures available they can repost? I just need the schematic so I can wire this up, now that o2sim.com is gone.

Thanks,
Slag

 

Dead dead deadski

 

http://forums.maxima.org/5th-generat...tallation.html

Fixed link from first post.

 

any schematics of this wire-up still exsist on these forums ?? would help immensly