2002 Hyundai Accent GL Auto Transmission/sensor problem? - Hyundai Forums : Hyundai Forum
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#1 Old 05-23-2012, 11:21 AM
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can00k
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2002 Hyundai Accent GL Auto Transmission/sensor problem?

Started about a month ago, already had the ATM diode replaced (part #91789-34200).

It's an automatic. Car will rev high and not shift properly. Going over 80km/h, it will stay in 3rd gear, never shift to 4th and the check engine light comes on. It does this for a while, then the light goes away after turning car off and it shifts fine again for a day or two. Then the same cycle.

My mechanic has found the following diagnostic codes:
p1529
p734
p708

Symptoms are very similar to Gearshift Issue but not getting code P0722

Any thoughts would be appreciated. I really don't want to keep throwing money at this not knowing exactly what's wrong.

Edit: Remember one other thing I found last night when this problem popped up again: Going from neutral to drive, there's a very noticeable jump/jerk. Not sure if that's relevant or not but figured i'd mention it.

Last edited by can00k; 05-23-2012 at 11:24 AM.
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#2 Old 05-25-2012, 03:58 AM
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jbob is an unknown quantity at this point
Sounds like an electrical issue to me. It could be the speed sensors or the wires connecting. You can try inspecting the wires, connections, and contacts, and also test the sensors, or just replace the sensors and wires they come with.

Also p0708 is range switch code:

(DTC P0708 TRANSAXLE RANGE SWITCH - HIGH INPUT)

You may just need to replace the transmission range switch, also called neutral safety switch.

When an error comes up you get P1529 (requests check engine light to come on). Due to certain error codes the TCM will go into safety mode not allowing to shift into 4th gear. That is likely the issue there, but see below.

Last edited by jbob; 05-25-2012 at 04:10 AM.
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#3 Old 05-25-2012, 04:01 AM
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P0734
DTC NO
DIAGNOSTIC ITEM
P0734
FOURTH GEAR SYSTEM
- MALFUNCTION -

DESCRIPTION
• If the value resulting from driving the PG-A output (input shaft rotation speed) by the 4th gear ratio does not match the PG-B output (output shaft rotation speed) after 4th gear is engaged, DTC P0734 is output.

TROUBLESHOOTING GUIDE
Detection condition
• Engine speed>400 rpm
• Transfer shaft speed >900 rpm
• Fluid temperture>60°C
• PCM senses a signal that does not fall into the preprogrammed parameters.
Possible cause
• PG-B
• Transfer driven gear
• End clutch retainer
• Kickdown brake
• End clutch
• Malfunction of pulse generator (speed sensor) circuit
• Kickdown brake slippage
SYMPTOM
• Automatic transaxle will hold in 3rd gear (D) or 2nd gear (2, L) when code P0731, P0732, P0733, P0734 is output.
• Code P0717 or P0722 may also be set (pulse generator codes).
Check item
• Malfunction of pulse generator circuit
• Kickdown brake slippage
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#4 Old 05-25-2012, 09:54 AM
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can00k
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Thanks for your suggestions jbob!

An update: my mechanic took a closer look at the issue and found that my battery has been leaking onto a number of sensors and wires below it. He's going to test everything and replace what's needed. I will update this thread when I find out what exactly needed replacing and if it actually fixes the problem for good!
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#5 Old 06-15-2012, 08:36 PM
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can00k
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Unfortunately this problem has come back again after about a week. Anyone have any other ideas? I hate throwing money at this and not know exactly what's wrong.
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#6 Old 06-20-2012, 02:02 AM
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MARTE is an unknown quantity at this point
I will say is the thrust bearing in the OD, i just replaced mine. Remove the sensor and look for metal shaving (mine had a big metal on the sensor magnet) or remove the oil pan and you will have a surprise with the shaving.
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#7 Old 06-20-2012, 04:53 PM
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can00k
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Quote:
Originally Posted by MARTE View Post
I will say is the thrust bearing in the OD, i just replaced mine. Remove the sensor and look for metal shaving (mine had a big metal on the sensor magnet) or remove the oil pan and you will have a surprise with the shaving.
Thanks for the suggestion but when the mechanic dropped the pan, no shavings were found on the magnet. We're still thinking it some kind of electrical or sensor problem, but still can't figure out where. The problem is intermittent, and of course when I am able to stop off at the mechanic the car is running fine.
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#8 Old 07-25-2012, 08:46 AM
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can00k
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An update: this problem has for the most part gone away, although very rarely every couple of weeks the gears will slip, but the issue disappears once again after I shut off the car and turn it back on again. I figure it's just something I'll have to deal with from now on.
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#9 Old 07-29-2012, 01:30 PM
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newhyundaier
It's highly likely you have a sensor problem. I would check the pulse generator first.
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#10 Old 07-29-2012, 04:52 PM
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blbbrai is an unknown quantity at this point
I have the same problem with error codes ETS Limp home Mode valve on P1191 and ETS Limphome Low ROM P1193
Have had a new sensor in and check light comes on when it sticks in 3rd gear. Also goes into 3rd if check light is on and I could be in 5th on motorway and BAM drops into 3rd gear. AA man checked it and found these error codes. Am taking it to garage tomorrow. But strange thing is - it always sticks in 3rd gear - which then puts the error light on - at the same location - never misses and once the check light is on it can happen again anywhere. I have discovered that this area has 3 phone masts and it always sticks there!! Any thoughts??
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