I am new in this forum. I just bought new xg30 1999 with 62000 KM. I am having following problems,

When I turn AC on in Neutral or Parking, RPM are fine but as I shift Drive or Reverse then engine starts shaking and RPM dance between 400 to 900 and it seems like engine will turn off. But if I again shift to Neutral or Parking it will come again to normal.

Miss fire happens most of the time when I drive from stop and even at higher speed. It seems like I can not even get high RPM properly putting paddle downwards and also engine has lack of power. But some times it is just normal and drive smoothly. (AC problem exists)

Misfire also happens above 3000 rpm. Its kind of like cutting fuel supply to engine.

Check Engine Light is not on.

I will appreciate help.

Thanks

This post has been edited by sheraz: Nov 29 2009, 12:11 PM

Hi there

Can anybody help me out regarding the problem I have written above. Please suggest according to your experience what shall I do and what should be inspect accordingly.

Well I have found out the pressure leakage at 1st and 3rd fuel injectors. O-Rings were damage. Change them but still rough idle. Small Vacuum pipe going out of front injector line to the relay attached after to it always clicks randomly as I give accelerator. Do not know if it is normal or some defect.

Thanks

Update from today!!

First of all I feel nobody here is to help as I did not get any reply or seggestions. Moderator and Admisitrator could suggest something to check according to their experience.

Well today I took MAF connector off and I saw rpm is very smooth and it even goes to 7000 very smoothly and this relay (connected to the vacuum pipe coming out of fuel injectors) does not clicks randomly. No misfire at all. As I put MAF connector again on problem came back. Engine stall, misfire happened and rpm does not go up smoothly and if it does engine stall in between and this relay again click randomly.

I do not have check engine light on even when I took the MAF connector off. I never saw it on even if I turn ignition on. I do not know if it is out of order or it never turn on until you have problem.

Could any one please suggest me if it is MAF sensor not working properly or what could be a problem.
Tomorrow have a pollution test. Do I have to take it before this problem is fixed or first fix it and take a test.

I would highly appreciate help of you guys and thanks to you all in advance.

firstly you must remember that you will not always get an instant reply to your posts. it would depend on when members that have the knowledge to answer your questions are on-line. sometimes you maybe lucky but other times you may have to wait several days. also bear in mind that members may not be able to answer your question.

however to your other point. it does from what you say sound like you are having trouble with the MAF. if this becomes faulty it does not normally trigger the CEL (as in your case)

if you are going to take your car for an inspection l would keep the MAF plugged in for now but it does look like you will need a new one

l hope this answers your question

Thank you very much for your answer.

But is it normal if you turn your ignition on check engine light does not come on. Because in my case i never see it on.

What is this relay which act strange and start click randomly upon connecting the MAP connector. It does also when I turn on A/C .

I just want to make sure that this is problem with MAF sensor and do not want to spend money around as the previous owner has to changing the ECU, Alternator, Battery etc.

Could you please suggest something esle to check to make sure this problem is with MAF sensor?

Well I would say thanks to all of you making and arranging this forum. It saved us lot of money and headache upon your experience with this very complicated electronics structure of xg's.

your CEL should come on when you turn on the ignition. you have a problem there (it might just be the bulb broken)

under the circumstances l would strongly suggest you have any possible fault codes read with a scanner. (if your CEL is not working you have no way of knowing if you have any faults)

you suprise me when you say that the last owner had to have the ECU changed. l have never heard of anyone having to change the ECU on a XG (alternator and battery are common)

BTW the clicking that you can hear is normal.

again, best get the codes read before you spend anymore money

Well I have got the bills from last owner and the garage who has checked with GDS got following code P0743

I do not know what this code is actually for.

I can read the following, TCM Defect must change ( This all bill and diagnose written in German)

and something written they checked lot of wires as there were not proper communication between torque converter clutch and TCM

Motor-Steuergerät (ECU) changed ( Part No. 39110 39168).

I am surprised too and I do not think if it was the right problem to change the ECU. What you suggest what is this code P0743 for?

If they just did it and code does not refer to this I would talk to them as I got it all in written and they charged like 2600.- swiss franks.

About this clicks from relay, is it some kind of vacuum adjuster from the fuel injectors?

Thanks

This post has been edited by sheraz: Nov 4 2009, 03:38 PM

code PO 743 is torque converter clutch circuit (electrical malfunction)

l can't give you a positive answer about the 'clicking' ATA SOLENOID DIAGNOSTIC TROUBLE CODES P0740, P0743, P0750, P0755, P0760, P0765, P0770

This TSB supersedes TSB# 01-40-010 to correct repair information.
DESCRIPTION:

Incorrect operation of the transaxle solenoids may result in the following symptoms:

<LI class=ITEM>Erratic shift<LI class=ITEM>Transaxle held in 3rd gear Fail-Safe<LI class=ITEM>Diagnostic Trouble Codes P0740, P0743, P0750, P0755, P0760, P0765, P0770
• MIL illuminated

NOTEDo NOT replace the transaxle for solenoid codes listed above. Instead, follow the repair procedure shown below.
REPAIR PROCEDURE:

• Using a Hi-Scan Pro, check for DTC in both the "Engine" and "Automatic Transaxle" menus. Record the DTC and description
  .

• Disconnect the connectors between the solenoid and TCM. Check for bent pins or pins not fully inserted in the connector. Repair as necessary. NOTEClean connector pins with a contact cleaner listed below, or equivalent:
  
  • NAPA Electronic Cleaner, P/N 765-1843
  • MOPAR MP-50 Electrical Contact Cleaner, P/N 04549626
  • Permatex Electrical Contact Cleaner, P/N 24379 or equivalent.

• Check the wiring harness between the TCM and transaxle for a damaged wire or a short circuit to ground. If so, repair or replace the ECM control harness, P/N 914XX-XXXXX.

• Check the harness inside the transaxle oil pan for a short circuit to ground. Replace the harness if damage is found or if three or more solenoid DTC are found in Step 1. (Refer to TSB# 02-40-009 for instructions). MODELHARNESS P/NSonata, Elantra, Santa Fe, Tiburon
  46307-39050
  XG300/350
  46308-39550
  Oil temperature sensor
  46386-39050
  Valve body gasket
  46264-39510

<LI type=1 value=1>Refer to the DTC recorded in Step 1 and follow the repair procedure shown below: DTCREPAIR PROCEDUREP0743, P0750, P0755, P0760, P0765, P0770, or P0740 together with P0743
Replace the related solenoids
P0740 only (no other solenoid DTC found)
Check "Engine" and "Transaxle" menu for DTC:

• If no DTC P0335 or P0725, replace the transaxle.
• If DTC P0335 or P0725, follow procedure below.
P0335 (Crankshaft position sensor malfunction)
Check harness and connectors to CKP sensor and ECM/TCM. If OK, replace CKP sensor. Delete solenoid DTC.
P0725 (CKP sensor - open circuit)
P1529-TCM MIL request signal
Delete code

REPLACING THE SOLENOIDS:

• Remove the battery.

• Drain the radiator. Remove the lower radiator hose from the radiator.

• Drain the ATF.

• Remove the valve body cover from the transaxle.

• Refer to the DTC recorded in Step 1 and replace the related solenoid according to the diagram shown. Tighten the bolts to 4-5 lb.ft (50-70 kg.cm). Go to step 11.

• Apply Ultra Gray Gasket Sealer, P/N 00231-13800 to the valve body cover and reinstall the cover. Tighten the bolts to 6-7 lb.ft (80-100 kg.cm).

• Add approximately five quarts of SPIII ATF and check the level with the engine idling in Neutral. Recheck the ATF level when the ATF is at normal operating temperature (70-100°C, 159-212°F).

• Clear the codes and test drive the vehicle for two driving cycles (two key-on to key-off driving cycles, including 1-2-3-4 upshifts and 4-3-2-1 downshifts). If the DTC returns, perform the following repairs: DTCREPAIRP0743, P0750, P0755, P0760, P0765, P0770, or P0740 together with P0743
  Replace the TCM. If DTC returns, replace the ECM control harness, P/N 914XX-XXXXX.
  P0740 only (no other solenoid DTC found)
  Replace the TCM. If DTC returns, replace the ECM control harness, P/N 914XX-XXXXX.

PARTS INFORMATION:MODELPART NUMBERPART NAME1999-2003 Sonata
46313-39050
Solenoid Valve (Qty 1)
2001-03 Santa Fe
2001-03 XG300/350
2001-03 Elantra
2003 Tiburon
ALL
00230-11000
SPIII ATF
WARRANTY INFORMATION:MODELOPERATIONOP CODEOP TIMEOP QTYNATURE CODECAUSE CODE1999-2003 Sonata
Replace Solenoid
45775R00
2.6 M/H
1
*N27
**C31
2001-03 Santa Fe
2001-03 XG300/350
2003 Tiburon
2001-03 Elantra
Replace Solenoid
45775R0B
All
Scan Tool Operation
45775RP0
0.3 M/H


Normal warranty applies.DTC INFORMATION:

For your reference, the logic the TCM uses to set solenoid codes are listed below:NOTEDo NOT replace the transaxle for those codes listed as "Open/short". Refer to the tables for additional information.


TCM DTC - 1999-03 Sonata, 2001-03 Elantra, XG And Santa Fe, 2003 Tiburon:
COMPONENTTCM DTCMALFUNCTION CRITERIATIME REQUIREDDRIVING CYCLESMILCOMMENTDCCSV
P0743
Open/short
0.3 sec.
2
Yes
Electrical condition
L And R
P0750
UD
P0755
2ND
P0760
OD
P0765
RED
P0770
DCCSV
P0740
Solenoid duty 100%
4 sec.
Hydraulic or damper clutch condition

about your check light when i got my car someone had cut the wire at the back of the clocks so the light didnt come on soon as i conected it back up check light was on all the time think they had cut it so i didnt no it had a fault when i got the car

Dear montego

Thanks for your kind and detailed reply. TCM has been replaced or repaired from last owner with the code PO 743 shown on the bill.

As I can feel my CEL has been disconnected or bulb is not working fine first I have to make it working and see if CEL is on. If yes I would bring it to have the all codes read.

My only problem at the moment,

MAF connector attached (lake of power in Engine, misfire, engine stalls, etc) and automatic confused sometimes between 3 to 4 and 4 to 5.
MAF connector disattached, (no misfire, rpm goes up till 7000 without any problem)

I am still not sure if this is the problem is with MAF or something esle could be. How I can be make sure with the MAF before to replace it as it costs 500 CHF. Is there any other mathoed to check it?

Well I had yesterday my anti polution test and it was all fine.

I will soon update with codes if there are any in ECU.¨

Inbetween any solution or check with MAF?

Thanks

this is why l advised you to get the fault codes checked before you replaced the MAF.......if you can rule out any other problems with the scanner then it is almost certain to be the MAF at fault

Update from Today!

I have checked the CEL and saw there was no bulb inside the speedometer. I put a new one and now it works.

Regarding my problem, No check engine light is eliminated for any problem about lake of power and misfire. It does when I take the MAF sensor connector off.

I do not know what to do regarding my problem if no CEL is eliminated. What are the suggestion?

One new thing I saw was two holes welded after the catalytic converter of both sided. I think there suppose to be O2 sensors. (I assume xg30 has 4 O2 sensors) but I am not sure. I attached the pictures here. Kindly some one let me know if there must be O2 sensors or nothing. I read on the bill from last owner that one workshop made 2 holes for checking the pollution of both BANKS. may be these are them...?


Thanks

This post has been edited by sheraz: Nov 9 2009, 10:02 AM

there are two 02 sensors on the XG that are fitted very close to where those holes have been drilled (on the opersite side of the pipe). l can't think why they did this as you can check the mixture on both banks using a scanner

if you are sure that there are no other fault codes then the next logical step would be to change the MAF

please note that l can not guarantee that this will cure your problem as nobody can be sure without actually seeing the vehicle, but that is what l would do next

Dear Montego

Thanks for the answer. But I can not see and find the other 2 O2 sensor after the catalytic converter not even the wires going to them.

My question are they 4 or 2 on XG? How can I see them.? Because I am thinking these holes must have O2 sensors in them and some one removed them any how?

Would appreciate if I can find a picture where I can see the O2 sensors after catalytic converter.

I think I must check the MAF sensor replaced with someone to see if it cured the problem.

Thanks again and I will update again.

Cheers

please read my last answer again......l told you there are TWO 02 sensors NOT FOUR.......l have just double checked on one of my own XG's and the 02 sensors are fitted very close to where you have your holes drilled.

as you say there should be wires coming from them. get under your car and have another look.

IF and l say IF, your 02 sensors have been removed then it would light the CEL and the car would not run properly and it would not have past the emission test

Dear Montego

Thanks for your answer. I am sorry if I am making it complicated.

I have 2 O2 sensors fitted each side of both banks before the catalytic converter which I can see for example, Sensor of Bank1 is just on the right side and parallel of alternator and just front of middle of radiator. I heard somewhere there are total 4 O2 sensors in xg's, 2 before catalytic converter of each bank and 2 after catalytic converter of each bank.

If you say they are total 2 then Its fine.

Well If I take the connector of my O2 sensor1 of Bank1 check engine light does not eliminated. I do not know if it is normal.

Thanks

sorry sheraz, l think l may have confused you. when l said there are two sensors l ment there are two on each bank (so, yes that would make four in total)

sorry if l confused you (IMG:style_emoticons/default/imsorry.gif)

Dear Montego

Thanks for the reply.

Can you please provide me a picture where your O2 Sensor 2 Bank1 is located..? I will appreciate that if it is possible?

Are 4 of these are same in size with 4 wire connectors?

Cheers

Sheraz

l hope this will help you. all four sensors have four wires

DESCRIPTION:

The illustration below explains the following terms:

• Engine BANK
• Up = Sensor 1 = Front = Closer to the exhaust manifold = Before the Catalyst
• Down = Sensor 2 = Rear = After the Catalyst

• Bank 1 is closer to the dash panel = RH (right hand)
• Bank 2 is closer to the Radiator = LH (left hand)

The following O2 Sensor EXAMPLES show how to interpret the terminology:

• B1/S1 = Bank 1/Sensor 1 = Dash Panel Side, BEFORE the catalyst
• B2/S2 = Bank 2/Sensor 2 = Radiator Side, AFTER the catalyst

(IMG:http://www.hmaservice.com/files/331/1099121/0336003A.gif)