2007 1.8Tdci P0489 Throttle Peddle Disables

[isx600]

Hello,

Have a bit of an odd one here and I think the issue is electronic / electric rather than mechanical

Had the cruise control on on the motorway and all of a sudden the speed starts dropping, checked I wasn't climbing, hit the + button, no speed increase, pressed the throttle peddle down, no response, cruise off, throttle peddle down still nothing, by now I've made my way to the slow lane, drop a gear, throttle peddle down and still nothing so I coast to the nearest SOS box and stop, pressed the throttle peddle down the engine responds like nothing happened. I shut it down, checked under the bonnect for anything unsual such as smoke, loss of fluids etc. Decided to carry on with my journey and put the cruise back on, about 20 mins later same thing again,

Pulled over, throttle responds so carried on again without shutting down and didn't use the cruise for the remainder or my journey, 30 mins later got home put my scanner on and found P0489 logged. Very much doubt the EGR valve has failed but itis possible that the sensor is not happy.

Didn't reset code as I was going to call Ford Assist (included with the dealer service) out in the morning. Got up early, had a nose around the bonnet and nothing stood out, started the engine up and noticed that the charge light stayed on, scanner back on, P0622 was now logged.

Called Ford Assist, AA came out, explained the above and we both agreed it's not mechanical, while the charge light was still on noticed that none of the heated screens would come on, A/C disabled understandably so.

EGR sensor connector was clean, battery termnials OK, same on alternator, system was charging OK. Has not had a full charging test done.

After coming up empty handed the only thing left to do was clear the codes and that was the end of it. I have been up and down the motor way during day light hours and the odd late evening running and I have not had the throttle peddle lock out on me.

This was last sunday, 70 mile trip from A to B and a fuel stop 20 miles in. Last night same journey, slightly longer due to an accident and detour, 10 miles to go and on cruise the bug struck again, came off at my exit and knowing what I know, as soon as I come to a rest the throttle peddle will come to life. Got to the traffic lights and as I guessed, throttle peddle responded, got home OK, scanner on and P0489 was logged.

The only difference was last night I didn't use any of the heated windscreens but I had 2 fuel stops, one just in case because of the detour and the second when I got to my regular Shell stop. Last night the night time running was an hour longer and based on what I can count as events I should have had more instances of the throttle peddle being locked out if the was battery / alternator / charging system.

Car is due for a service in less than 800 miles, it is on 77900. The alternator has always had a slight whine, well over 3 years now. Intake manifold elbow replaced 1k miles ago.

Enginer performace is perfect except for this "issue" and fuel economy is the same.

I clearly have a gremlin and I'm down to:

1. EGR sensor is on it's way out, it's still a monifold replacement - costly.

2. Alternator is on its way out - will have to be replaced at some point.

3. battery giving up - another item that will eventually need to be replaced.

4. Wiring issue.

5. Charging system not happy.

Has anybody had a P0489 and a P0622 logged one after the other, I have no idea how I'm going to isolate things and everything I have researched has not come up with a firm solution. I'm keen to find out how the 2 fault codes are related.

Any ideas?

Adam

[jeebowhite]

There was something similar recently, and I cannot for the life of me remember what the name of this part was!

There was basically a thin hose that had collapsed and was causing issues, IIRC it was the breather hose, so well worth a look!

[isx600]

Thanks, I've had a look aound the engine bay and nothing out of the ordinary sticks out. I have found a pin 2 plug on the top of fuel filter housing unplugged, most likely from the last service. Is this the fuel heater as in the wiring diagram this is the only 2 pin connector related to fuel?

[jeebowhite]

Not sure off the top of my head, it's not an obvious hose though. As for the connector, normally you would have a wire there if the connector is on the unit itself?

Sent from my MY SAGA C2 using Ford OC mobile app

[isx600]

Had my car serviced early August, charging system checked, battery was OK and alternator was charging OK. Car ran good for a week after the service and told to bring it back when the faults are present.

You know when you have that feeling something is not right, one thing I noticed was the throttle was not as fluid as it used to be, I kept getting the P0622 fault if I launched the car from a stand still and then the dreaded derate kicked in. On one of my runs the charge light started to flicker etc and I thought nothing of it until the alternator started to whine and I was far from where I needed to be, 2 miles from my destination the smell hit me from the alternator then dashboard lit up like a christmas tree, just about every electrical component shut down, steering, ABS. It was a tense moment as the steering is not light and the throttle was all over the show. By the time I parked the battery was dead, the car had been running off the alternator and would not even wind the window up. Disconnected the battery after I parked it just to be safe.

AA chap came out, put some power to the alternator and used his heat gun to check the temp on the alternator, the windings were getting hot hence the burning smell earlier. Towed the car to the dealer the next morning.

New Denso alternator fitted and a new Ford battery. I have not had any issues, the little gremlins have not surfaced.

As for the wire on the fuel filter housing it has been plugged back in, I forgot what it is for!

In hindsight I should have changed the alternator and battery when I had the car serviced, given the age it would have done no harm apart from my wallet and I would habe avoided the "drama" that unfolded. The risk of fire is something to consider as well.

[Usman]

so, i am having a similar problem. 

My drives fine when I disconnect the MAF plug but I get really bad millage. Just bought the new MAF but it has not solved the problem. 

With the MAF cable plugged in, the car drives in a limp home mode. it does not rev more than 3000 rpm. at idle the maf reading is about 94g/sec. and when i rev it, it drops to 9.4g. I believe it is supposed to go up not down. 

 

these are some of the codes that i am getting.

 

P0489 EGR control circuit low

P2263. TURBO CHARGER/ SUPER CHARGER BOOST SYSTEM PERFORMANCE.

P0101: Mass or volume air flow - circuit range/ performance problem.

Greatly appreciate any advice. 

[Tdci-Peter]

On 11/01/2017 at 2:01 PM, Usman said:

maf reading is about 94g/sec. and when i rev it, it drops to 9.4g.

Those MAF readings look complete rubbish!

If it is a diesel (1.8TDCI like the OP?), then at 850rpm I would expect about 15g/s. Rising roughly pro-rata with rpm, unless the turbo cuts in when it will go up more.

Looks to me like either the replacement MAF is duff (not impossible!), or there is a wiring problem between it and the pcm.

I don't think the turbo error has any meaning if the MAF flow is wrong, and the EGR problem is usually completely separate. EGR problems are common, I have had a few. The actuator part can be bought separately now for about £100, and is very easy to replace, unlike the valve itself.

My EGR report: http://www.fordownersclub.com/forums/applications/core/interface/file/attachment.php?id=38763

[DJ_Andy_M]

Might also be worth pulling the EGR off and giving it a good clean if you can on these engines? Its a messy job mind. Did my old Mondeo MK3's a couple of times.

[FatHead1979]

Unfortunately on this engine (I've got one) the EGR is part of the manifold and the sadistic T**T at Ford that designed it clearly designed it to make it far more work than it should be to remove! 

[Tdci-Peter]

53 minutes ago, 1979Damian said:

the EGR is part of the manifold

Yes it is, but on the bright side, it is easy to blank the EGR without problems on this engine.

However it is vital that the actuator part of the valve works, or the MIL comes on. But the actuator is dead easy to remove, and can be repaired or replaced for not too much cost.

In my (limited!) experience, most EGR problems on these cars are in the actuator. The electrical parts of this are a very shoddy design, unsuited to the vibration & temperature there.

[FatHead1979]

3 minutes ago, Tdci-Peter said:

Yes it is, but on the bright side, it is easy to blank the EGR without problems on this engine.

Yup, mine has been blanked for a couple of years now with no issues.  Only took the blank off temporarily for a Terraclean and never looked back!  (130K miles and still original turbo, injectors, high pressure pump, clutch and DMF....hope I'm not tempting fate, lol)