OBD Code P0440 Emissions HELP please
- Thread starter jeast
- Start date
I have no silver bullets to offer.
0440 is a Evap Malfunction, but Rover doesn't even list a proceedure for diag on that code.
Do you have other codes with it?
0440 is a Evap Malfunction, but Rover doesn't even list a proceedure for diag on that code.
Do you have other codes with it?
Look what I found.... THis may help.
Purge Valve
The EVAP canister purge valve is located in the engine bay at the LH side of the engine intake manifold. The valve is held in position by a plastic clip which secures the inlet pipe of the purge valve to a bracket mounted at the rear of the engine compartment. On NAS vehicles with secondary air injection, the purge valve is fixed to a metal bracket together with the SAI vacuum solenoid valve; the purge valve is fixed to the bracket by two plastic clips.
A nylon pipe connects the outlet of the purge valve to the stub pipe on the plenum chamber via a short rubber hose. The connector to the plenum chamber is a quick-release type, plastic 90? female elbow; the connection is covered by a rubber seal which is held in position on the port stub pipe.
A service port is connected in line between the EVAP canister and the inlet side of the purge valve and is rated at 1 psi maximum regulated pressure. The service port must be mounted horizontally and is located close to the bulkhead at the rear of the engine bay. The service point is used by dealers for pressure testing using specialist nitrogen test equipment for localising the source of small leaks.
The purge valve has a plastic housing, and a directional arrow is moulded onto the side of the casing to indicate the direction of flow. The head of the arrow points to the outlet side of the valve which connects to the plenum chamber.
Purge valve operation is controlled by the engine control module (ECM). The purge valve has a two-pin electrical connector which links to the ECM via the engine harness. Pin-1 of the connector is the power supply source from fuse 2 in the engine compartment fusebox, and pin-2 of the connector is the switched earth from the ECM (pulse width modulated (PWM) signal) which is used to control the purge valve operation time. Note that the harness connector for the purge valve is black, and must not be confused with the connector for the Secondary Air Injection vacuum solenoid valve which is grey.
When the purge valve is earthed by the ECM, the valve opens to allow hydrocarbons stored in the EVAP canister to be purged to the engine inlet manifold for combustion.
If the purge valve breaks or becomes stuck in the open or closed position, the EVAP system will cease to function and there are no default measures available. The ECM will store the fault in memory and illuminate the MIL warning lamp if the correct monitoring conditions have been achieved (i.e. valve status unchanged for 45 seconds after engine has been running for 15 minutes ). If the purge valve is stuck in the open position, a rich airfuel mixture is likely to result at the intake manifold, this could cause the engine to misfire and the fuelling adaptions will change.
The following failure modes are possible:
Sticking valve
Valve blocked
Connector or harness wiring fault (open or short circuit)
Valve stuck open
If the purge valve malfunctions, the following fault codes may be stored in the ECM diagnostic memory, which can be retrieved using 'Testbook':
P-code Description
P0440 Purge valve not sealing
P0444 Purge valve open circuit
P0445 Purge valve short circuit to ground
P0443 Purge valve short circuit to battery voltage
Purge Valve
The EVAP canister purge valve is located in the engine bay at the LH side of the engine intake manifold. The valve is held in position by a plastic clip which secures the inlet pipe of the purge valve to a bracket mounted at the rear of the engine compartment. On NAS vehicles with secondary air injection, the purge valve is fixed to a metal bracket together with the SAI vacuum solenoid valve; the purge valve is fixed to the bracket by two plastic clips.
A nylon pipe connects the outlet of the purge valve to the stub pipe on the plenum chamber via a short rubber hose. The connector to the plenum chamber is a quick-release type, plastic 90? female elbow; the connection is covered by a rubber seal which is held in position on the port stub pipe.
A service port is connected in line between the EVAP canister and the inlet side of the purge valve and is rated at 1 psi maximum regulated pressure. The service port must be mounted horizontally and is located close to the bulkhead at the rear of the engine bay. The service point is used by dealers for pressure testing using specialist nitrogen test equipment for localising the source of small leaks.
The purge valve has a plastic housing, and a directional arrow is moulded onto the side of the casing to indicate the direction of flow. The head of the arrow points to the outlet side of the valve which connects to the plenum chamber.
Purge valve operation is controlled by the engine control module (ECM). The purge valve has a two-pin electrical connector which links to the ECM via the engine harness. Pin-1 of the connector is the power supply source from fuse 2 in the engine compartment fusebox, and pin-2 of the connector is the switched earth from the ECM (pulse width modulated (PWM) signal) which is used to control the purge valve operation time. Note that the harness connector for the purge valve is black, and must not be confused with the connector for the Secondary Air Injection vacuum solenoid valve which is grey.
When the purge valve is earthed by the ECM, the valve opens to allow hydrocarbons stored in the EVAP canister to be purged to the engine inlet manifold for combustion.
If the purge valve breaks or becomes stuck in the open or closed position, the EVAP system will cease to function and there are no default measures available. The ECM will store the fault in memory and illuminate the MIL warning lamp if the correct monitoring conditions have been achieved (i.e. valve status unchanged for 45 seconds after engine has been running for 15 minutes ). If the purge valve is stuck in the open position, a rich airfuel mixture is likely to result at the intake manifold, this could cause the engine to misfire and the fuelling adaptions will change.
The following failure modes are possible:
Sticking valve
Valve blocked
Connector or harness wiring fault (open or short circuit)
Valve stuck open
If the purge valve malfunctions, the following fault codes may be stored in the ECM diagnostic memory, which can be retrieved using 'Testbook':
P-code Description
P0440 Purge valve not sealing
P0444 Purge valve open circuit
P0445 Purge valve short circuit to ground
P0443 Purge valve short circuit to battery voltage
B
barrios35
Guest
What did you end up doing to get rid of the code? I took apart the regulator seemed pretty clean. Connection is also clean. Wondering if I need to just buy a new one and replace it? Hoses seemed pretty well connected too so I don't think it is a leak. I have an 01 DII with 103K.
Bump-- I too have a recurring P0440... also have emissions testing coming up soon. can't seem to keep the code at bay. Comes back after fuel tank fill-up... when the truck idles rough for a second or 2 on restart (immediately after the fill-up) then, after i goose it a little, all is right... except the CEL is illuminated permanently (which is no good for the emissions screening, because, rumor has it that they will not do the testing if the light is on...)
Also, could this be why my truck will only drink middle grade - premium gas? with the gas prices the way they are now, that price stinks. On cheap unleaded, the truck will knock like crazy on acceleration or under load...
00 DII, 88,000 mi (knocking since i bought it at ~47,XXX mi [yes, a few shy of warranty)
------------------
2 points:
1.) chris-Stlouis, if you read this, please consider opening your own rover shop in St Louis!!!
2.) last summer, i filled up my wife's rover, then went home (3 blocks away) and brought back my '93 Land Cruiser to fill up... the guy at the pump next to me (the one i just filled up my wife's DII on) was on his cell phone when i overheard him say, "holy s#*t! someone just spent $60 on gas on this pump...)... yea, he was driving a civic or something... That was a $120 night to fill up 2 cars for the week. Ahh! I can't wait for summer again! (not!):ack:
'00 DII
'93 fzj80 (o:
Also, could this be why my truck will only drink middle grade - premium gas? with the gas prices the way they are now, that price stinks. On cheap unleaded, the truck will knock like crazy on acceleration or under load...
00 DII, 88,000 mi (knocking since i bought it at ~47,XXX mi [yes, a few shy of warranty)
------------------
2 points:
1.) chris-Stlouis, if you read this, please consider opening your own rover shop in St Louis!!!
2.) last summer, i filled up my wife's rover, then went home (3 blocks away) and brought back my '93 Land Cruiser to fill up... the guy at the pump next to me (the one i just filled up my wife's DII on) was on his cell phone when i overheard him say, "holy s#*t! someone just spent $60 on gas on this pump...)... yea, he was driving a civic or something... That was a $120 night to fill up 2 cars for the week. Ahh! I can't wait for summer again! (not!):ack:
'00 DII
'93 fzj80 (o:
B
barrios35
Guest
jeast said:
My DII 2001 had the same code changed the purge valve did the trick. Thanks to Chris-St Louis for your help!
1.) chris-Stlouis, if you read this, please consider opening your own rover shop in St Louis!!!
Thanks! I have thrown it around. I have a friend willing to finance it... The gig I have no is so great though, I dont want to leave. But if they get sick of me and fire me off, I'll open a shop.... I have thought about it for some time.
Thank youfor the ego boost though.
B
barrios35
Guest
Ok 4 months later and code is back? Do you think it is the valve again? I bought it at LR so they said they would warranty the part for 1yr. Any thoughts?
S
Swa j-Ten
Guest
Hey guys -
In addition, you may want to investigate the integrity of the filler neck and gas cap. If there is a crack in either, or a bad seal, your evap code will appear.
That code comes when there's a leak somewhere in the vacuum of the system. MOST TIMES, like chris said, it is the faulty purge valve.
If the problem is persistent, it is a function of the less obvious - the gas cap and the filler neck. Especially if you're noticing this after a fillup. Make sure that cap is on tight - and that the seals are not rotten.
Best - Elias
In addition, you may want to investigate the integrity of the filler neck and gas cap. If there is a crack in either, or a bad seal, your evap code will appear.
That code comes when there's a leak somewhere in the vacuum of the system. MOST TIMES, like chris said, it is the faulty purge valve.
If the problem is persistent, it is a function of the less obvious - the gas cap and the filler neck. Especially if you're noticing this after a fillup. Make sure that cap is on tight - and that the seals are not rotten.
Best - Elias
Swa j-Ten said:
Because I really am like in the real world like I am here.
I'm sure others will vouche for it.... I REALLY am as out of hand as you think.
S
Swa j-Ten
Guest
Out of hand? What do you like walk around hitting people over the head with a rolled-up newspaper?
B
barrios35
Guest
eliaschristeas said:
I will check those tonight.. Thanks.. I found it wierd that the valve would go out again after 3 months.