P1689 ERROR CODE - Cause of code Found! - TheDieselGarage.com
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post #1 of 7 (permalink) Old 01-28-2009, 07:19 PM Thread Starter
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P1689 ERROR CODE - Cause of code Found!

Well gang...

Mopar1973Man is back out in his shop and found the cause of P1689 error codes.

Quote:
P1689 - No Communication Between ECM and Injection Pump Module Data link circuit failure between ECM and fuel injection pump. Low power, engine derated, or engine stops.
A lot of us assume its the injection pump that causes this which in most cases could be. But I was doing a fuel pressure test (cranking). This requires to pull the fuel system relay out of the PDC box under the hood...




Lower left side labeled fuel pump...

When this relay is missing the VP44 doesn't energize nor pump fuel. It allows you to do the cranking test. But it also sets a P1689 and CEL light. So for all of you that have a P1689 error code present check your fuel pump relay first by trading with another relay!

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #2 of 7 (permalink) Old 01-31-2009, 02:03 PM Thread Starter
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Addon to this post I did a short video of the fuel pressure test that causes the code...


Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #3 of 7 (permalink) Old 02-01-2009, 12:47 PM Thread Starter
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That's odd 52 people look at the thread and no comment...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #4 of 7 (permalink) Old 02-01-2009, 01:42 PM
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Quote:
Originally Posted by Mopar1973Man View Post
That's odd 52 people look at the thread and no comment...
I am in awe... still trying to process! So you weren't trying to diagnose the 1689 by doing the pressure test, the code set after/because of the test, correct? It's amazing the amount of good info you collect/generate and post. I NEVER leave here without learning something. Once again, good job!

Russ
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post #5 of 7 (permalink) Old 02-01-2009, 06:08 PM Thread Starter
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I can't seem to find the proceedure but it request that you pull the fuel pump relay from the PDC to do the cranking fuel pressure test.

When I was completeled the code was tripped... So it was a learning curve for me...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #6 of 7 (permalink) Old 02-02-2009, 04:44 AM
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i didn't look it up, but i believe thats what my truck threw when the suspect was the Throttle Positions Sensor (APPS) the truck would just cut out but stay running at an idle..... i'm not 100% sure....

are there any symptoms beside just having the code?
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post #7 of 7 (permalink) Old 02-02-2009, 02:36 PM Thread Starter
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Quote:
Originally Posted by carharttkid629 View Post
i didn't look it up, but i believe thats what my truck threw when the suspect was the Throttle Positions Sensor (APPS) the truck would just cut out but stay running at an idle..... i'm not 100% sure....

are there any symptoms beside just having the code?
APPS codes (P0121, P0122, P0123). APPS codes will alow the truck to run but no throttle change.

P1689 No Comm between VP44 and ECM. The engine won't even start...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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