I just got a SES light and the code was 0234. What is it and is it ok? I got rid of it with my xcellerator handheld but am still worried.


Ben http://www.dieselplace.com/forum/smileys/Rock On.gif

Not sure if this is exactly it, nor am I a tech, but here's what it says on AutoTap's web site:


P0234 - Turbocharger Engine Overboost

My boost has been upto 32 before without any SES. Is this too high? I was just driving normal today and passed someone with authority and I noticed SES light. Thanks


Ben

You're going to have to wait for a tech or someone else who really knows on that one to be sure, but IIRC, 32 is the magic number for setting overboost codes give or take sensor error...http://www.dieselplace.com/forum/smileys/Ermm.gif


I've seen at least one post from one of the members who got about 50 more RWHP after installing his Stage III, maybe that's got something to do with it?


But I'm just guessing here, sorry I don't know more...http://www.dieselplace.com/forum/smileys/Confused.gif

I just got a SES light and the code was 0234. What is it and is it ok? I got rid of it with my xcellerator handheld but am still worried.
Ben

Looks like there's a difference between "Federal" (RPO FE9, NG1) and "California" (RPO YF5, NE1) emissions so the diagnosis procedure is different between the two... Anyway, here's what the Helm Manual says under Circuit Description;
The boost sensor responds to changes in the intake manifold. This pressure is created by the turbocharger and changes with the acceleratr pedal position(APP) and engine speed. The engine control module(ECM) uses this information to provide engine overboost protection. The boost sensor has a 5-volt reference circuit, a low reference circuit,and a signal circuit. The ECM supplies 5 volts to the boost sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The boost sensor provides a voltage signal to the ECM on a signal circuit relative to the pressure change. The ECM monitors the boost sensor signal for the voltage outside of the normal range. The ECM calculates a predicted value for the boost sensor. The ECM then compares the predicted value to the actual signal. This DTC will set if the boost pressure signal is above the predicted range.

Conditions for Setting the DTC:
The measured boost pressure is above the expected range by 35 kPa or more for 12 seconds.

Action Taken When the DTC Sets:
- The ECM illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails.
- The ECM limits fuel delivery.

Might clear the DTC & see if it comes back quickly.
If so, might just be a faulty boost sensor....

good luck,

T.(not a tech, but I have a Helm Manual)

"Looks like there's a difference between "Federal" (RPO FE9, NG1) and "California" (RPO YF5, NE1) emissions so the diagnosis procedure is different between the two... Anyway, here's what the Helm Manual says under Circuit Description;
The boost sensor responds to changes in the intake manifold. This pressure is created by the turbocharger and changes with the acceleratr pedal position(APP) and engine speed. The engine control module(ECM) uses this information to provide engine overboost protection. The boost sensor has a 5-volt reference circuit, a low reference circuit,and a signal circuit. The ECM supplies 5 volts to the boost sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The boost sensor provides a voltage signal to the ECM on a signal circuit relative to the pressure change. The ECM monitors the boost sensor signal for the voltage outside of the normal range. The ECM calculates a predicted value for the boost sensor. The ECM then compares the predicted value to the actual signal. This DTC will set if the boost pressure signal is above the predicted range.

Conditions for Setting the DTC:
The measured boost pressure is above the expected range by 35 kPa or more for 12 seconds.

Action Taken When the DTC Sets:
- The ECM illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails.
- The ECM limits fuel delivery"





What does this mean in english? I must be an idiot with this.


Ben

It means the ECM thinks the turbo is producing too much pressure for a given RPM.


It's a system familiarization discussion to help you diagnose the problem. It sounds like you should just clear the code and see if it happens again.


If it does happen again, you're gona need a real Tech to help you figure it out, and that might require you having access to a Tech II in order to diagnose the problem.


Last from me on this, you need a real Technician.