S80 2001 2.9 fault codes p0443 (EVAP Signal missing) and P1152

danreznik · Post by **danreznik** » 26 Mar 2018, 03:39

Hello, I'm new to Volvo and this forum and I'm happy that I have found this community.
I recently bought a Volvo s80 2001 2.9 as a project car. So far there where ups and downs with the project but I was able to fix-up the car and get it running and I'm using it as my daily driver.
As part of the project, I started eliminating fault codes (when I started there where more then 25 fault codes now there are 2) and I encountered fault code P0443 EVAP Signal missing.
Initially I thought that the problem was with the Vapor Canister Purge Valve, so I replaced it, about a month ago, with the used unit, but the fault refused to clear. So thinking that the used unit was also faulty, I replaced it with a new original unit, and the fault code was cleared.
However, two days ago, the fault came back together with another fault code P1152. and the car started to have slow acceleration, struggled when I drove up a small hill and the engine was vibrating strongly on idle. I hooked the car to a ODBII code reader and cleared the code, and the car ran smoothly again, yet today the symptoms came back and the codes as well. Again I cleared the codes and the car again started to run smoothly.
So I'm at a loss at the moment, and I don't know what the problem is or if the two code are related and why the p0443 code came back after I replaced the part with a new original.
I would greatly appreciate your help and advise.

Post by **RickHaleParker** » 26 Mar 2018, 15:46

.

You're barking at the wrong component.

: Canister purge (CP) valve.gif (8.04 KiB) Viewed 2021 times

ECM-4000 (P0443) Canister purge (CP) valve. Signal too high, too low or missing.

Diagnostic trouble code (DTC) information

A2301969 Condition
Diagnostic trouble code (DTC) ECM-4000 is stored if the signal from the canister purge (CP) valve is too high, too low or missing.

Substitute value
Twin heated oxygen sensor (HO2S) control disabled. *

Possible source
Signal too high:

short-circuit to supply voltage in the signal cable
defective canister purge (CP) valve

Signal too low:

short-circuit to ground in the signal cable

Signal missing:

open-circuit in the signal cable
defective canister purge (CP) valve
contact resistance in terminals
open-circuit in power cable

Fault symptoms
Malfunction indicator lamp (MIL) lit.

---------------------------------------------
* P1152 is the Front heated oxygen sensor (HO2S). Get the P0443 fixed before you put any time and money into the P1152.

danreznik · Post by **danreznik** » 26 Mar 2018, 23:48

I change this part two times. after the second time the fault was cleared and now it came back again.
the fault I get is EMC-4000 canister purge (CP) valve - signal missing.

Post by **RickHaleParker** » 27 Mar 2018, 11:53

I change this part two times. after the second time the fault was cleared and now it came back again.

The other components are the wiring and electrical connectors. The only other thing it could be is wiring or electrical connectors. The fact that it comes and goes indicates intermittent electrical contact.

1. Clean purge valve connector, replace if too corroded.
2. Pull the ECM and clean edge connector, look for corrosion.

If that does not fix it, start digging for defective wiring ... opens and shorts. Keeping in mind it is intermittent ... wiggle the wires as you take readings.