BJohnson2

<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> After installing a set of SLP Long Tube Headers, High Flow Cats, and Y Pipe on my 2000 Trans Am, my car threw a code. P0430: Catalyst Effiency Below Threshold Bank 2. I talked to a Pontiac dealership and they said that there isn't enough back pressure reaching the 02 sensors for the computer to read (or something along those lines). SLP said that I would have to have my computer reprogrammed. Is this true? If so... where are the places that do reprogramming? Is it possible to do it with Hypertech Power Programmer or is there something I can buy to do it my self? I live in Ohio. There's no places around here that do anything with LS1 engines. Also, I was going to add some more small modifications. Not sure what though. Should I have these done before doing the computer? All help is welcomed and definately appreciated.

Thanks,
Brian

2xLS1

iTrader: (25)

You can delete the rear O2s with custom tuning, LS1Edit or just get a couple of O2 sims.

CMNTMXR57

Here, for bathroom reading;

DTC P0430 Catalyst System Low Efficiency Bank 2

Circuit Description
In order to maintain a reasonably low emissions of Hydrocarbons (HC), Carbon Monoxide (CO), and Oxides of Nitrogen (NOx), the engine controls system uses a three-way catalytic converter. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO present in the exhaust gas. This reaction converts them into harmless water vapor and Carbon Dioxide. The catalyst also reduces NOx, converting it to Nitrogen. The PCM monitors this process using Bank 2 HO2S #2. Bank 2 HO2S #2, located in the exhaust stream past the three-way catalytic converter, produces an output signal which indicates the oxygen storage capacity of the catalyst. This determines the catalysts ability to convert exhaust emissions effectively. If the catalyst is functioning correctly, the Bank 2 HO2S #2 signal will be far less active than that produced by Bank 2 HO2S #1. This indicates that the three-way catalytic converters oxygen storage capacity is below a threshold considered acceptable.

When the conditions for running this DTC are met, the following occurs:

- The PCM captures the current rear HO2S rich/lean status.
- The Air Fuel ratio transitions from rich to lean or lean to rich depending on the capture rear HO2S rich/lean status.
- The Air Fuel ratio transitions a second time opposite the first Air Fuel ratio transition.
- The PCM captures the response time (the time the HO2S goes from below 300 mV to above 600 mV and from 600 mV to below 300 mV) of the front and rear Heated Oxygen sensors when the Air Fuel ratio transitions occurred.
- The PCM measures the time it takes the rear HO2S voltage to cross a reference rich/lean threshold minus the time it takes the front HO2S voltage to cross the same rich/lean threshold. The time difference from the front and rear HO2S is the oxygen storage capacity of the catalyst. This DTC sets if the time exceeds a predetermined threshold.

Conditions for Running the DTC
- DTCs, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0171, P0172, P0174, P0175, P0200, P0230, P0300, P0325, P0327, P0332, P0335, P0336, P0341, P0342, P0343, P0351-P0358, P0401, P0404, P0405, P0410, P0412, P0418, P0440, P0442, P0443, P0446, P0449, P0500, P0704, P0801, P0803, P1258, P1336, P1404, P1415, P1416, P1441 and HO2S DTCs not set.
- The engine is operating for longer than 400 seconds.
- The ECT is between 80°C (176°F) 120°C (248°F).
- The IAT is between -15°C (5°F) and 75°C (167°F).
- Engine speed is more than 900 RPM for a minimum of 22 seconds (manual transmission) or 25 seconds (Automatic Transmission) since the end of the last idle test.
- The BARO is more than 74 kPA.
- The fuel system is operating in closed loop.

Conditions for Setting the DTC
The PCM determines the oxygen storage capability of the catalytic converter has degraded below a calibrated threshold.

Action Taken When the DTC Sets
- The PCM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame and/or Failure Records.

Conditions for Clearing the MIL/DTC
- The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL and the DTC.

Diagnostic Aids
If the HO2S parameter is monitored using a scan tool while this diagnostic is running, the HO2S voltages may be fixed low or high.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

4) Before replacing the three-way catalytic converter, make sure that any conditions which may have caused the catalyst to be damaged have been corrected.

Step 1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
--
Yes: Go to Step 2
No: Go to Powertrain On Board Diagnostic (OBD) System Check

Step 2

Are any other DTCs set?
--
Yes: Go to the applicable DTC table
No: Go to Step 3

Step 3

Inspect for the following conditions:

- Verify that the three-way catalytic converter is an original equipment part.
- Inspect the three-way catalytic converter for damage such as dents, severe discoloration caused by excessive temperature, holes, etc.
- Insure that internal three-way catalytic converter rattle caused by damaged catalyst is not present.
- Inspect exhaust system for leaks, damage, or loose or missing hardware in the area from the converter to the HO2S #2 primarily. Refer to Exhaust System Inspection in Engine Exhaust.
- Insure that the HO2S #1 and the HO2S #2 are secure and that their pigtails and wiring are not damaged or contacting the exhaust.
Did you find and correct the condition?
--
Yes: Go to Step 5
No: Go to Step 4

Step 4

Replace converter. Refer to Oxidation Catalytic Converter Replacement in Engine Exhaust.

Is the action complete?
--
Yes: Go to Step 5
--

Step 5

1) Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool.
2) Idle the engine at the normal operating temperature.
3) Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
4) Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?
--
Yes: Go to Step 6
No: Go to Step 2

Step 6

Select the Capture Info option and the Review Info option using the scan tool.

Does the scan tool display any DTCs that you have not diagnosed?
--
Yes: Go to the applicable DTC table
No: System OK

BJohnson2

To everybody who replied and any future replies. Thanks for your help. I'm going to try the O2 simms. I'm sure that'll work. If it comes to it, I'll use LS1 edit, I don't think I'll need LS1 edit at this stage yet.

-Brian

<small>[ April 21, 2003, 08:24 PM: Message edited by: BJohnson2 ]</small>

The Dragon

iTrader: (6)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 2xLS1:
<strong> You can delete the rear O2s with custom tuning, LS1Edit or just get a couple of O2 sims. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ditto. Custom will cost you 400 - 600 each tune, O2 simulators will cost $100 and no tuning capabilities, LS1 Edit will set you back about $550 and you can do EVERYTHING <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />