P1403 Code 03 sprinter

Dealer scanned code and it came up with the p1403 code. From my searching it means no 5v to egr. I only get 3.5 volts to the egr. Anyone see this before? Any ideas were the wiring runs and how to check it. I am thinking about checking the voltage at the ecm.. Any ideas would be great.

Thanks

I included the wiring diagram for the EGR.

I would also disconnect the battery, remove the connector that contains the RED/YEL line from the ECU, and measure the continuity and to chassis GND.

Might as well check/clean the EGR while you're there.

jasonsprinter03 said:

Dealer scanned code and it came up with the p1403 code. From my searching it means no 5v to egr. I only get 3.5 volts to the egr. Anyone see this before? Any ideas were the wiring runs and how to check it. I am thinking about checking the voltage at the ecm.. Any ideas would be great.

Click to expand...

The 612's 1403 EGR codes typically refer to flow issues. The 612 EGR valve does not receive a 5V output from the ECM. It is controlled by a PWM 12V signal (ECM maps based on MAF sensor and boost sensor inputs). This PWM signal needs to be evaluated with a scope not a voltmeter. Doktor A

After messing around with a used egr that should not have been sold to me... I spoke with Doktor A. and he gave me his client price on an new egr. After a few trips it seems to be working fine. I hope the egr was the entire problem. After speaking with Doktor A he sure know his sprinters.

Thank You Doktor A...

Jason

abittenbinder said:

The 612's 1403 EGR codes typically refer to flow issues. The 612 EGR valve does not receive a 5V output from the ECM. It is controlled by a PWM 12V signal (ECM maps based on MAF sensor and boost sensor inputs). This PWM signal needs to be evaluated with a scope not a voltmeter. Doktor A

Click to expand...

Hello Doktor A. I am also having this 1403 code on my 2002 Freightliner. This EGR is only about 2 years old and I just replaced my 3yr old MAF sensor with a quality Bosch part. My P100 code went away, but the 1403 is still there. Any ideas on what to check next?