2004 V70 P2402 Woes (Leak Detection Pump Current)

PennaPilot · Post by **PennaPilot** » 16 Mar 2017, 07:05

Thankfully I got my car through PA safety and emission inspection before this code popped up again.

I've already replaced the gas cap twice. One is a stancor and one is a Dorman.

The weird part is that the Gas cap will have liquid fuel on it when its at a half tank.

I do want to check my LDP before I replace it, Does anybody have specs (voltage and pressure) for the LDP?

Is there a hose diagram somewhere on the internet for the vapor circuit?

Post by **abscate** » 16 Mar 2017, 08:40

First, clear the code and see if it returns. These systems are sensitive and you might find its a sporadic thing

PennaPilot · Post by **PennaPilot** » 16 Mar 2017, 17:57

Wiped it. Within 2 drive cycles its back on.

Post by **abscate** » 17 Mar 2017, 03:53

I have 2005 info for my NA and will post what I have. Do you know where this is located?

Post by **abscate** » 17 Mar 2017, 04:28

Ah, unfortunately there is a big change from 2004 to 2005

The LDP oils above the tank, accessible after removing the charcoal canister

On 2005s, the ECU grounds it to run. You can test it for 12 V supply of course, pin 4 on the pump connector

On 2004 cars, the pump is run by grounding at the ECU, but the heater circuit is run by the CEM.

PennaPilot · Post by **PennaPilot** » 17 Mar 2017, 14:50

Thanks for the Pic. Now I just need the vent/vacuum diagram to figure it out.

Its really weird. If the temperature is above 40F it won't throw any codes. But at 39F it starts. Maybe I have a leak?

Post by **abscate** » 17 Mar 2017, 15:18

There is a temperature heating element in the LPD - maybe it is burned out??

PennaPilot · Post by **PennaPilot** » 18 Mar 2017, 08:42

Thats what I'm thinking. Or that its a piece of rubber that expands when its hot.

How can I tell if my software is up to date without going to the dealer?

I see IPD has the pump pretty reasonably.

PennaPilot · Post by **PennaPilot** » 20 Mar 2017, 18:01

So did some peeking around.

Volvo couldn't put that pump anywhere else?

Found the following:

The harnesses under the seat was loose. ziptied it together to keep that from happening.

J-pipe was loose on the non hoseclamp end to the canister. Cleaned and greased it reinstalled and made sure it was attached. Did a light tapping on the pump housing and alas.......

No check engine light. Go FIgure

gds1970 · Post by **gds1970** » 15 Jul 2018, 12:26

I also just started getting p2402 for a 2004 v70r. I'm still a little confused as to if this code indicates whether the LDP pump is outputting some signal that is not permitted, indicating a pump failure, or if it is possible just that there is a fuel vapor leak somewhere in one of the hoses/attachments coming from the pump or tank.
thanks