₦airaland Forum

GAZZUZZ:


Let's understand the 2 codes.

P2646 HONDA Rocker Arm Oil Pressure Switch Circuit Low Voltage

Oil pressure loss will trigger this code.



P2647 HONDA Rocker Arm Oil Pressure Switch Circuit High Voltage

A faulty pressure switch

Or

Engine ecu not seeing the pressure switch will cause this code

Replace the oil switch if you are 100per sure the connectors are firm.

There's a trick to stop the leaks.

Ensure the gasket is not brittle, it it is replace it.

If you get a soft but flat gasket and you want to use it, contact me on whatsapp for the trick

The only way to make sure the connector is making proper contact is by stripping part of the connector wires the test but which should i check, continuity or voltage?

I will try to ensure contact of the connector.

I currently have no leakage. The last leakage was on the oil switch, between the plastic and metal parts. I used 4min adhesive around it which stopped the leak.

Lastly, for the ABS problem, i saw a trouble shoot process in the service manual. The instruction was to read voltages on the ABS modulator but the connector was not exactly as shown so i got confused.

Modified

This morning before going out, i used an office pin to adjust the connector contacts and also scratched the inside of the contacts. So far so good, the limb mode is gone. I hope it remains that way.

My Oga,

I brought to you issues on my ABS and Radiator fan switch. I have a third problem which i have investigated and sought for solution but now confused. I have gotten the Multimeter to check the ABS and the Radiator fan switch but have not done so yet especially for the fan switch which needs a 24" wrench which i don't have.

I have a P2647 problem that succeeds a P2646 problem.

My P2646 used to be occasional especially after i wash engine. This results in a limb mode where my engine speed is limited below 3000rpm. I have 2 valve body for the Rocker arm actuator.

I had leakage of engine oil at the sensor due to bad gasket which i got a used one and replaced. When buying the used one the seller took the gasket off a rocker arm sensor where the solenoid was broken while he removed the oil switch so i begged him for the valve body which he gave me for free. I installed that free valve body with my solenoid and oil switch but had more leakages so i reverted back to my old one. After these while, my car would just go into limb mode with P2646 without provocation and sometimes go out of the problem by itself. Now i cant seem to get it off my back. It has changed to P2647 when recently i moved both the oil switch and solenoid to the free valve body i removed previosuly. With both valve bodies i will get limb mode after like 1hr of driving. Now i have a permanent limb mode.

I got solutions online which suggested the multimeter diagnosis. All test gave me good results but not a solution.

I was to check for continuity with the connector removed and engine off. If there is continuity, change sensor but if not proceed. There was no continuity so proceeded to checked for voltage across the connector and body ground with ignition at on(II), there was 11V which means OK. Next was to check for voltage across the 2p connector. Same 11v. Next was to check fof continuity on the oil switch 2 pin terminals while engine was running which i didn't and got continuity. All the test means the oil switch was good, and there was signal from ECU. The solenoid too works but i still have limb mode with the 2 valve bodies.

What will u suggest?

melc4real:
This just happened on 3rd mainland bridge as Honda Accord bolt joint pulled out causing traffic

This is not a pull out but clearly a front left impact affecting the wheel.

Besides the pull most times doesnt happen on speed.

Specialist900:
oga, did you later do this? I'm in same dilemma at the moment

Never got to do it until my CAT got blocked. During removal my O2 sensor was damaged.

erico2k2:
Just a quick one all ECU is hard wired to the main ECU, even your seat ECU

NO.

Thats all the components of my ABS. No ECU, It has its ECU.

Watch this Video and see where Vehicle speed sensor is on a 98-2001 Honda Accord
https://www.youtube.com/watch?v=1kdwgQzcV0E

Even Cruise control is dependent on this sensor.

erico2k2:
YOu have not brought anything new to the table Ooh, we have both covered input and output sensors in the part.
The ABS sensor sends a reading to teh main ECU, loads of other thing in your car feeds from this signals,was it not you I shared what uses this same signals in my car with? let me check, Im sure it was you.


I wrote this last time we had this conversation Remember

well I have been at work hence my very brief and short reply now Im home
I have read fru your quotes and that of crowly.I dont know how new your own car is so i cant say but Im going to use my car as an example and how its system works hope it thrwos more l ight into the VSS relative to it uses.
Now my car is a 2012 Range Rover sport Autobiography so comes fully loaded this is how the VSS works
Now the Variable Assist Power Steering (VAPS) system uses Vehicle Speed Sensor (VSS) input to regulate power steering pressures for higher assist at slow speeds, making parking lot maneuvers easier to perform. The Anti-Lock Brake System (ABS) uses VSS information to determine when a wheel is locked up and releases pressure to that wheel to maintain directional stability. Some vehicles use separate sensors for the ABS, but it is common that the computer uses the information from the wheel sensors to act as a VSS. For example, many newer Ford vehicles use a rear axle mounted speed sensor for both ABS and computer related vehicle speed functions. Instrument Cluster (IC) and Hybrid Electric Cluster (HEC) modules use vehicle speed info for speedometer operation.I have a 2004 jeep liberty in Nigeria this is waht it uses as shown on that pic.
The vast majority newer Vehicle Speed Sensors are of the permanent magnet type, and function much the same as a CPS sensor. The sensors can be mounted either in the transmission case (like yours) or rear differential assembly(Jeep and Ford). Those in the transmission are typicaly gear driven, and those in the differential function by using a trigger wheel mounted with the ring gear. Both style sensors perform the same task.
I hope this is more clearer grin grin

The gear driven speed sensors where last used by Honda in the 1993 model.

Whether its an Autobiography, HSE, sport or a Ferrari there are basics do not change. Speedometer wont work correctly from readings from wheels. Its the transmission output that is used for speedometer. Rear axle is still part of the transmission output. Beyond the differential, speedometer readings will be inaccurate. Do your research well.

My ABS unit has its own ECU and all wheel sensors are connected direct to the unit. The whole component system of the ABS does not involve the ECU.

erico2k2:
OK have you seen waht the ssensor reads speed from, waht it looks like?have you seen this sprocket B4?I think you should take a look at it, I try not to do Internet pictures these days, but I will see if I can get one and if anyone here can plz upload.
That sensor by ur transmission is mainly inpute and output sensors.These are car specific, may I ask you for what car are you referring to?
This link is an ABS RIng, http://www.ebay.co.uk/itm/FOR-TOYOTA-AVENSIS-COROLLS-CAMRY-ABS-RELUCTOR-RING-/332275680430?epid=721067216&hash=item4d5d2c84ae:g:xF8AAOSwdGFYvIzW
The Sensors points unto this teeth(gears).Least we 4get the power of rotation is transferred to the Hub from the drive shaft which forms part of the ABS,

Just because u specifically say u dont want an internet picture.

Luckily i have the next best thing. My service manual.

There are 2 of those sensors in the transmission. One measures input and the other output.

Like i said before Wheel sensors are used by ABS and VSA but not speedometer.

erico2k2:
The speed cameras do not use minutes, it just judge your speed, there are white lines marking on the road and the camera show a laser on this tract,, modern cameras use GPS to mark your speed on these locations too..The one on my way to work is 40 miles/hr with tolerance of just 2 Miles/hr, you do 42.1 miles/hr it flashes and you got a speeding ticket sent to you.,even if I Upgrade my tyres to 19 as Planning to do next week, I aint still going to utter my speedo.

How can a camera just read speed? Can my mobile phone camera read speed? No camera can read speed.

Speed is a relationship between distance and time. Take one out of the other, its no longer speed.

There is no speed without time. No speed measuring device can measure speed without time and distance.

U just mentioned white lines, do you know that these white lines are placed at a particular fixed distance apart? That is very important to tell the speed. Secondly, whether radar, infrared, Camera or GPS, the all have to measure the time you crossed the first white line to the time u crossed the second white line.

Kilometer / hour which is distance / time.

Speedometer sensor measures time by way of counting revolution while the size of tire provides the distance and together they become speed.

erico2k2:
The spedoo picks its readings from a sensor mounted 90 degrees to a sprocket withing the ABS module, the size of the tyres bears no significant to its reading unless you upgrade the ABS module by
A putting a bigger sprocket
B Puting a smaller sprocket then you can alter the speedo.
Read few pages back, we already covered this,I guess you just saw this now.

You covered it but i still dont agree to it.

I still maintain, that if you change the diameter of ur tires, your speedo becomes errornous and would need recalibration.

Speedometer, ABS, Vehicle stability sensors sensors all work the same way by measuring rotation but not distance. They all measure rotation along the drive line or hub. The speedo is calibrated with a fixed tire to know the speed that is a fact u refuse to accept but it is.

My car is a front wheel drive which has 4 ABS sensors. The front measures rotation of the CVT joint while the rear measures rotatiion of the hub. Speedometer sensor is located in the trasnmission.

The way ABS works is it tracks vehicle speed by means of the speed sensor located in the transmission. Say vehicle speed is 100km/h. But there are 4 ABS sensors in each wheel. They all should be doing 100km/h or there about. If one tire becomes 0km/h while the vehicle speed sensor reports 100km/h the wheel is considered locked and ABS kicks in.

Speedometer is independent of ABS but ABS is dependent on speedometer.

Conner44:
Okay, I'm not an engineer so I will explain in layman terms as i understand it. In the picture below (it's just a rough hypothesis)

What you had under your car was fig. A

What you now have is fig. B

meanwhile assuming you did your upgrade as in fig. C, I'm certain your trusty speed camera would be telling you a different story

Take note of the dimensions as it changes. The tyres in fig. A & B both have the same ride height but that in fig. C is higher than they are

Very true. Thats the point i have been trying to make.

Diameter will look like

A=15+5=20
B=17+3=20
C=17+4=21
A and B will not affect speedometer but C will.

Circumference of a circle or wheel is equal to or same as the distance the circle or wheel will cover in one complete revolution.

C=2πr

Distance

A=2 x 3.142 x 10 = 62.84
B= same as A= 62.84
C= 2 x 3.142 x 10.5 = 65.98

Difference in distance covered for every totation is 65.98-62.84=3.142

For every complete tire rotation, tire C will be ahead of tire A and B with 3.142inches. This translates to 0.0798m.

62.84 in = 1.598m

A and B will cover 1km in 1000m/1.598m= 625.78 rotations

65.98in =1.676m

If C under goes the same rotation it will cover 625.78 x 1.676 = 1048.81m = 1.04881km

For every 1km C is ahead by 0.0488km or 48.8m.

When
A and B is traveling at 100km/h
C is travelling at 100 + (100x0.0488)= 100+4.88 =104.88km/h

Also every 1 hr, C is 4.88km ahead of A and B.

If A B C are to travel same journey say a 100km journey traveling at 100km/hr, A and B would arrive in 1hr while C will arrive in 104.88/100=60/x. If u simplify for x u get 57.21minutes.

Finally, the torque needed to rotate tire A/B and C cannot be the same. Therefore C would consume a proportional amount of fuel needed for A and B to cover same distance.

akagaba:
Op, wake up... as soon as u left, 500 more people walked in so dont come here and disgrace urself. If u have allowed d devil to take a hold of u, then seek deliverance somehwere becus so many lives are being changed and transformed in Christ Embassy. We dont preach sin in CE cuz thats not what God asked us to preach. We rather preach the goodnews of the gospel of our Lord Jesus and thats the gudnews that brings sinners to God.

For money matter, its only a poor man that speaks d way u do. We give big, very very big in CE and thats becuz we serve a big God so deal with ur poverty.

U dont sound like a Christian at all.

grandstar:
I just asked a corper and he said 2.49 is third clsss

Corper? I thought u will say a professor.

asuustrike2009:
They're telling the truth. Most universities wouldn't accept nothing less than 3.0

Lies.

Even third class can do Masters directly with a minimum of 5 years relevant experience.

Some departments puts its limits higher but thats the minimum standard.

grandstar:
2.5 is the lowest possible 2nd class lower one can receive.

A friend of mine finished with 2.49 which is a third class. Affected him badly. He read accounting

Another friend finished with a 3.49 GPA , the highest possible 2nd class one can receive. He read Law. He is the company secretary to a bank

Guy, both 2.49 and 3.49 are 2.2.

opeaceo:
That grade score can't be the lowest, you can't be too sure. Prolly some schools have a different grade rating. In my school, 2.4 - 3.49 is awarded as second class lower.

Its not just your school, its the entire Nigeria or all schools under the NUC.

Some people can argue blindly sha. What does it take to do a little online search. Google it.

Refer urselves to this old thread
https://www.nairaland.com/1588636/change-university-grading-degree-structure

OrestesDante:
It's PGD bro!
Master direct I can't say

By the way which school awards 2.2 for a 2.4 G.P?

Are u a Nigerian graduate? 2-2 has always been 2.4CGPA in the 5 point and 2.2CGPA 4point Nigerian curriculum.

Controlv:
Good Afternoon Sir Gazzuzz

My 03 accord has an issue that my Mechanic has not been able to solve:
The car vibrates a lot when it's idle, especially when gear is engaged. It doesn't vibrate if I shift gear to park.

The car breathes hard at take-off but the breathing gets normal after take off. The gear shifts well and car doesn't vibrate on motion.

The car idles @ 1200 rpm at first start of the day, the rpm goes down to 800 after 4 minutes. It drives very rough if I engage the gear @ 1200rpm (had to idle for 4 mins @ first start to enjoy a smooth ride)

I have changed spark plugs and engine seats but no visible improvement.

Please help

I had vibration issues too. Mine went away by luck. My valve cover had oil leaks so i changed the gasket. My car became smoother.

Reason is that the front engine mount uses engine vacuum and ecu to control its stiffness. If you have little engine vacuum, you lose that function leading to more vibrations. So anything that causes you to lose engine vacuum will cause vibrations.

2ndly, check all the rubber exhaust mounts and replace old and stiff ones.

Lastly, you can resettle the seating of your engine by doing this. Loosen (slack) the mounting bolt of front, rear and right engine mounts. Start the car and hold brakes with hand brakes up. Shift to R for some seconds then shift to D some seconds too. Repeat the shifts before returning to P then turn off the car. Retight the mounting bolts.

Most mechanics install and tighten engine mounts when engine is proped with a jack. Its wrong, they are supposed to bolt and tighten the engine mounts to chassis or subframe then guide the mounting bolts without tightening. They are supposed to remove the prop before tightening. This may cause odd seating of the engine causing more vibration.

There is a service bulleting that suggest updating the ECU because of this vibration issue in the 2003 model. It seems having a 2003 Accord in Nigeria, one has to manage a little too much vibration which is supposed to be resolved by an ECU update. We dont have such facilities. I guess 2004/2005 came with such updates.

High idle at cold start is by default.

ivolt:
The babies are nothing but business assets to Jay Z.

My exact thoughts.

How can i begin to think of using my children business wise just after giving birth.

Checking her husbands phone. She will see something that she may not understand the context and will lead to more mistrust.

Before i got married i had a girl friend who is a nonidentical same sex twin but we were not dating. Fast forward 6yrs, my friend too is married. Me and her twin were only on hi/hello level but were facebook friends liking each others post.

One day out of the blue, the twin initiated a chat, after the pleasantries, she asked that she needs assistance from me. My mind went on red alert, what does she want when me and her had never had any kind of relationship or have never spoken to each other. She wanted me to assist her with 15k but i was broke at that time and couldnt help. I thought to myself someone could have hacked her FB account? I said to her, send ur acc no let me see what i can get. She did send and shockingly it was her account name. The chat ended while she was waiting for me to send something.

Later that day, i was sleeping, my wife took my phone and went through my SMS, Whatsapp, Fb messanger, in fact everything. She found the conversation and it was bye bye to my beautiful sleep.

There is no xplanation for giving a random girl 15k just like that. She still habours that day in her mind but she is very wrong and cannot be told the truth till today.

2 days ago she did same thing, she found a chat between me and a friend who was joking to have a sweet side chick for me. He even sent me a random pix, i called him a love-vendor and we laughed it off.

She saw that chat. What can i tell her? Maybe she should stop checking my phone.

Specialist900:
Ogas in the house


Please, this socket has been dangling since I bought my car Nigerian used, I've searched to see where it's supposed to fit into but can't find. My mechanic too doesn't know where it fits and said I leave it like that.


Where does the socket fit into pls?

What car is this. I guess baby boy.

Olisa4all:
Boss, I've been asking for the location of the rocker arm(bank1) Honda Accord 2006 V6, pls hep

Hope you see rocker arm assembly on this screen shot. Its almost the same thing but for your car it has two assemblies for each bank.

Am just lazy to get u that of v6.

Hausa boys and speed na like 5 and 6.

One dusted me with his 406 while i had my mother, wife, children, and sister in the car. For their sake i resisted the challenge.

Piyke:
I finally have the perfect solution for any kind of leak from that part. I serviced the part Honda said was non serviceable. Today mine is as dry as the Sahara and iVTEC works perfectly. I should put the procedure on my blog soon



What grade of oil do you use? P2647 more likely with using non recommended oil weights.
Sometimes an oil change takes care of the P2647. You just need someone that knows he's stuff to troubleshoot correctly; a loose connector to the VTEC pressure switch can cause it. If it doesn't go with an oil change, then you will need to change the VTEC oil pressure switch (Ensure you use the sensor that is black, if you use either the green or grey one [meant for different Honda's] the code will still come back)

I use mobil XHP. I dumped expensive oils due to shortening of oil which makes me spend so much on oil.

I have serviced the sensor several times both on my 03 and and my friends 08 Accord.

In my car, since i bought the car, if i wash engine, it comes up with this code for a day to a couple of days before it goes away on its own. One time, weeks later it refused to clear so i removed it and gave it a proper bath. The washing problem still exist. When i got a leak, i thought silicone gum would do but it never stopped it. I got a fairly good gasket in Kaduna panteka. The person also gave me the valve body with a broken solenoid connector but removed his oil switch. I used his valve body and gasket with my solenoid and oil swtich. The leaking got worst so i reverted back to my valve body. After my last engine wash, the code came and never left. I removed it and serviced it but after 100miles working well the code came back. I got another solenoid but again after 100miles the code came back. I used the car with the limb mode for a week, suddenly, 3 days ago, i surprisingly saw the car passed its previous 3k rpm limit. Right now i have no leak and its working.

My friends story is a bitter one. His has 2 solenoids and 2 oil switchs black and blue. During an engine work when the engine was removed, the mechanics where very careless and the 2 oil switch broke. They also manhandled the connector harness which destroyed the connectors which were also coloured to identify them. A search for the blue switch never gave fruit likewise the black. We got green instead but both never worked. We later got one black. The 2nd challenge was the harness which became confusing since the connectors broke and were cut out. I later realised that only the black which shows up as A (intake) during scan causes the limp mode. As it is now, only that side of his sensor has a good oil switch and the B side which is exhaust isnt working but no limp mode. Although he has a permanent Check engine light due to it.

He recently had his fare share of leak but was resolved.

luvinhubby:
P0155 - O2 sensor1
P2647 - Rocker arm switch
p0141 - O2 sensor2
p0977 - Shift solenoid

The bolded should worry you.
Replace the Rocker arm complete, that should solve the wahala.

Thank me later.

That P2647 is a bastard. Its a night mare for every honda.

My own will go into the code for few weeks and treat itself if i ignore it enough. My friends 08 accord was a pain in the ass for a long time from this problem.

The sensor is also notorious for leaking engine oil.

GAZZUZZ:
you can get it off a civic 2000-2005 engine, or an accord 1998-2001 engine, or a city 2005-2009engine. Also on a pilot 2003 engine

I remember swapping the thermostat housing on my sisters 05 Civic and remember changing the sensor when her engine was changed. Her car is parked now, i will remove hers since hers has since been on direct.

Or will contact the guy we sold the bad engine to, he might still have the old one.

Thanks for the direction. I hope they have the same temp switch range with mine.

BabaCommander:
No correct guy man will ever get caught cheating.

A married friend of mine resumed smoking secretly, his wife will be hostile to it if she found out. But this guy went to his side chick. PS no one leaves his used CD in his side chick's house so he placed the disgusting thing in an empty pack of cigar and pocketed it to dispose on his way home.

My guy totally forgot until wifey decided to do laundry.

"Baby what da f is this?" "smoking and wet condoms?" she shouted from outside.

He was just smiling like a fool.

I said me and her used the wet condom she found. She said she cant recall the tissue paper i used to wrap the thing. I said, probably a friend left it there .

I said "it wasnt me!"

GAZZUZZ:
and he looked and he Saw it.

Yea, couldnt see it but touched it.

The jumper did the magic. I went to work and back through hold up but no heating. I was scanning live during the trip in the morning. Temp at hold up was 88-90 degrees celcius and highway 85-87.

I called the electrician to find it for me, but he said he couldnt find it. He said i should come to him for solution i said no, thanks.

GAZZUZZ:
lower right hand corner, base of radiator. The thermistor has failed.

Thanks.

I know 08 accord has it there but didnt see it on mine, may be i have to look from under.

My reading yesterday suggested jumping its 2 pin connector, this will make it run direct from ignition. I will do that while i look for its replacement.