2004 Sprinter Limp Mode

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2004 Sprinter Limp Mode

Postby RyanH » Sat Jul 26, 2014 3:11 pm

I have a 2004 Dodge Sprinter in my shop that will go into limp mode within a minute of driving. Codes 2026 and 2030 set for the O2 Sensor low. I have load tested the wires from the ECM to the sensor and a new sensor has been tried with no change to the issue.

This is a Bosch wide band lambda sensor which I have a basic understanding of the operation but there is little to no waveform captures of this system out there. I understand that the ECM reads the change in current which is difficult to capture at such a low milliamp range.

Long story short, this is what I have found. The waveform generated by the ECM looks normal for the first few minutes at idle. Once the sensor reaches operating temperature and the heater pw cuts back, the signal degrades. At this moment the ECM enters a limp mode and opens the VNT turbo fully.

In order I have a capture of when the engine is cold. Next, a capture from a know good running 2005 Sprinter. Then a capture of the 2004 Sprinter at operating temperature while in limp. Finally, I have a capture of the transition of the signal with the heater duty cycle plotted.

Any thoughts?

Dodge_Sprinter_2004_Diesel_O2 sensor cold.psdata
(2.7 MiB) Downloaded 140 times

Dodge_Sprinter_2005_Diesel_O2 Sensor Cold.psdata
(2.68 MiB) Downloaded 111 times


RyanH
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Re: 2004 Sprinter Limp Mode

Postby KimAndersen » Sun Jul 27, 2014 8:39 am

Hi there

The DTC P2030 are related to the intake pressure sensor circuit according to my informations. You should check the basic specifications on this sensor - that is the circuit from the ECU to the intake pressure sensor. :wink:

Regards
Kim
KimAndersen
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Re: 2004 Sprinter Limp Mode

Postby RyanH » Sun Jul 27, 2014 4:52 pm

KimAndersen wrote:Hi there

The DTC P2030 are related to the intake pressure sensor circuit according to my informations. You should check the basic specifications on this sensor - that is the circuit from the ECU to the intake pressure sensor. :wink:

Regards
Kim



Interesting, this code comes up as an O2 sensor issue on all my information. That and the fact I is an issue with the system with the waveforms I have captured.
RyanH
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