P1689 ERROR CODE - Cause of code Found!

Mopar1973Man · 01-28-2009, 07:19 PM

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!

Mopar1973Man · 01-31-2009, 02:03 PM

Addon to this post I did a short video of the fuel pressure test that causes the code...

Mopar1973Man · 02-01-2009, 12:47 PM

That's odd 52 people look at the thread and no comment...

Deeslfxr · 02-01-2009, 01:42 PM

Quote:

Originally Posted by Mopar1973Man

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!

Mopar1973Man · 02-01-2009, 06:08 PM

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...

carharttkid629 · 02-02-2009, 04:44 AM

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?

Mopar1973Man · 02-02-2009, 02:36 PM

Quote:

Originally Posted by carharttkid629

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...

01-31-2009, 02:03 PM	#2
Mopar1973Man 2nd Gen Guru Threadstarter Join Date: Dec 2008 Location: New Meadows, Idaho Posts: 2,641 Points: 27,075 Thanks: 9 Thanked 140 Times in 131 Posts	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!

02-01-2009, 12:47 PM	#3
Mopar1973Man 2nd Gen Guru Threadstarter Join Date: Dec 2008 Location: New Meadows, Idaho Posts: 2,641 Points: 27,075 Thanks: 9 Thanked 140 Times in 131 Posts	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!

02-01-2009, 06:08 PM	#5
Mopar1973Man 2nd Gen Guru Threadstarter Join Date: Dec 2008 Location: New Meadows, Idaho Posts: 2,641 Points: 27,075 Thanks: 9 Thanked 140 Times in 131 Posts	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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02-02-2009, 04:44 AM	#6
carharttkid629 Member Join Date: Dec 2008 Posts: 43 Points: 573 Thanks: 2 Thanked 1 Time in 1 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?

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