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P1689

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First of all, Thanks to Michael for taking the time today to help me out, I just started working on troubleshooting the harness to see if its the problem

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  • Author

HAd to do maintenance on the first gen last nith. Still waiting on my Stabilant 22 to check the codes again

I always thought the P1689 code meant the electronics failed in the VP?

  • Owner

I always thought the P1689 code meant the electronics failed in the VP?

Not always... I've seen now...

[*]Bad ECM cause a P1689

[*]Bad Fuel Pump relay in the PDC cause a P1689

[*]Bad driver side ground cause a P1689

And a few more I can't remember right now...

  • Author

OK Time for an update:The 99 had the harness rung out between the ECM connector and the FPCM connector. no problems found. Reassembled using Stabilant 22 on all pins; Swapped the horn and fuel pump relays; I also put in a new fuel filter since it was apart to access the ECM connector. Fired right up' no codes. I will monitor for codes (the Actron OBDII monitor is sitting on the seat) the 92 is running fine, I am just leery of a 400K tranny. - found the electrical prob with the power windows so it can be driven in SC without AC now. It received a full fluid maintenance today

  • Author

Drove the 99 a couple of times, no codes; just lethargic as h$$@! No get up and go! The 92 is faster then this. Any thing else to check before writing the big check?

  • Owner

Too much restriction or air leak... You got to go back over the fuel system... :doh: From 18 at idle I got to 16 PSI at 80 MPH at WOT... 2-3 PSI drop is fine but a 9 PSI drop is a serious problem... * Stock fuel system (which I doubt since your at 18 PSI)* Suction restriction* Still got the stock line between the VP44 and stock filter* Suction air leak* Defective lift pump

  • Author

Fuel system is "stock": Lift pump is an Airtex from Advanced AutoI picked up a couple fleetguard filters at Cummins South today to change out the Wix I put in last weekend.

  • Author

Whats the best course of action?

FASS Drop-in + Relocation Kit

Fass Single Filter?

Truck has 275K, no mods; getting ready to drop in 50HP Injectors.

--- Update to the previous post...

Got code P0606 this morning, had to drive the 92 to work.

--- Update to the previous post...

So the truck started and threw the 606 Code

Used the Code Reader to clear the code. Code has not reappeared. VERY leery about driving the truck.

Looking at $400 to rebuild the ECM.

New HArnesses are NOT available from the "friendly" dealership anymore.

I want to fis it correctly, but I dont want to throw big $$$ at the wrong parts :cookoo:

  • Owner

FASS, Raptor or AirDog is fine... But no FASS DDRP... The DDRP doesn't have the volume nor does it correct the plumbing problems. As for the P0606 is a ECM failure code... Something happened there. Hmmm... But since the code hasn't returned I won't worry to much... But now if it comes back then you'll have to deal with the ECM.

  • Author

Ok, ordering the airdog 150 this week. Still leery about the EM cdes that it throws randomly. Still dont want to be stranded.

:iagree: when it goes the only leg you will have to stand on will be the wrecker.
  • Author

Well while you still got a leg to stand on I would start hunting for a ECM for a good price...

I have only been able to find places that will rebuild mine
  • Author

I found a problem in the harness today :

A green/white wire and a red/white wire with abraded insulation/bare wire exposed. I used liquid tape as a temporary repair

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--- Update to the previous post...

The two wires are located to the left of the white harness retainer

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