'98 Camry with P1765 code - Toyota Nation Forum : Toyota Car and Truck Forums

hurl · 10-25-2007, 11:39 AM

Ok I have a '98 Camry V6 just about 180,000 miles.

Did a tranny fluid change. Just dropped the pan and changed the filter. Not a flush.

1,000 miles later I get the dreaded CEL. I pull the code and get p1765.

P1765 Linear Shift Solenoid Circuit Fault
(Found it refered to as the SLN selonid)

Would this just be a problem with the solenoid and or the wiring to the ECM or could dirt be clogging the Valve body? And would a clog to the solenoid set off that code?

I've done a few fluid changes (just drains and refills) hoping if dirt maybe it would be moved. I also replaced the solenoid, but teh light rmains.

I've started tracing wires to the ECM but didn't have my Schematic of teh ECm plugs on me at teh time.

I'm dreading going to a tranny shop, and if I need to I just want to know as much as possible before going so any input would be appreciated.

Thanks

bigbird · 10-25-2007, 12:30 PM

hmm, i would have guessed the solenoid would be messed up. here this may help, repair manuals.

http://www.camrymanuals.com/index.ph...=107&topicid=0

hurl · 10-25-2007, 03:22 PM

Thanks,
I've looked at those manuals and the schematic for the ECM plug doesn't match mine. That's what was holding me up. I just got the correct one and hope to check the wires this weekend. I just don't think it's wire. It would be one coincidence if the wire went out within 1000 miles of a fluid change.

That's why I'm wondering if the solenoid reacts to fluid pressure or of it is more of a valve controled by the computer aqnd jsu opens and closes.

If it just opens and closes it could be wire, but if it reacts to fluid pressure may be the passage leading to it or going from the solenoid has dirt obstructing flow. Then I could just replace the valve body and not the whole tranny.

It needs to be inspected soon and they will not pass me with the CEL light on

Thanks

***toyomoho*** · 10-25-2007, 05:05 PM

The service manual implies the ECU monitors the electrical current to this valve. The valve is electrically operated via the solenoid to open and close. By regulating the amount current to the solenoid, the valve position is changed and thus hydraulic pressure.

Assume then if electrical current to the valve is too high this implies a short in the solenoid or wiring going to it. If the current is too low this implies the wiring or solenoid wiring is open.

Or it could be the valve itself.

If you have the service manual info find out where this valve is on the trans. The valve can be removed from the trans and both valve and solenoid tested per the procedure in the manual.

If you can’t get to the valve in time for inspection, might be able to trick the ECU. The manual states the solenoid should have a resistance of 5.1-5.5 ohms. Thus assume installing a resistor of this ohm resistance in place of the solenoid would make the ECU happy once again. Might start out with a 10W resistor rating.

dc_98_cam · 10-25-2007, 08:10 PM

Quote:

Originally Posted by hurl

Ok I have a '98 Camry V6 just about 180,000 miles.

P1765 Linear Shift Solenoid Circuit Fault
(Found it refered to as the SLN selonid)

Would this just be a problem with the solenoid and or the wiring to the ECM or could dirt be clogging the Valve body? And would a clog to the solenoid set off that code?

. I also replaced the solenoid, but teh light rmains.

I've started tracing wires to the ECM but didn't have my Schematic of teh ECm plugs on me at teh time.

I'm dreading going to a tranny shop, and if I need to I just want to know as much as possible before going so any input would be appreciated.

Thanks

When you actually take a look at the ECU plugs or connectors, remove the one going to the SLN, spray it liberally with electrical contact cleaner, allow to dry a minute, and deftly snap back into place. ...Maybe repeat the snap installation a few times. ... Problem could just be some dirt or oxide on the connector pins.

If you have the original SLN ... the one that was removed when you put a new one in, perform the SLN inspection procedure described on p. 477 of the Diagnostic section. ... The one using a 10 watt bulb and a 12V battery. If you see the plunger move left and right, you will know that the solenoid itself is good, and is not the problem .... it is wiring, a connector, or possibly the ECU.

If that doesn't tell you anything, then maybe try this:

If you look at p. 477 of the GEN 4 Diagnostic section of the repair manual, you should see a relevant circuit diagram for the SLN to ECU. .... Take a look at the wire color code and see if you can locate two ends of the same wire in your car ... just check for electrical continuity ....Do the same for both wires going between SLN and ECU. If the problem is not a broken wire, and it is not a defective SLN, then something is wrong with the ECU.

hurl · 10-25-2007, 08:17 PM

dc_98_cam,
Looks like you just mapped out my saturday.

I already did the Ohm check and it was good (5.1) but was unsure how to exactly to do the test with the bulb. I assume I would use the bulb like a fuse between the battery and the solenoid + connection right?

Thanks.

dc_98_cam · 10-25-2007, 08:27 PM

Quote:

Originally Posted by hurl

dc_98_cam,
Looks like you just mapped out my saturday.

I already did the Ohm check and it was good (5.1) but was unsure how to exactly to do the test with the bulb. I assume I would use the bulb as like a fuse between the battery and the solenoid + connection right?

Thanks.

Yes .. bulb in series with battery. .... Bring up the Gen 4 Diagnostic section ...
http://www.camrymanuals.com/index.ph...d=5&topicid=0&

Then . .. go to p. 477 ... should be enough details there.

If your original SLN tests good, then you have something else to look for .... wiring or whatever

hurl · 10-25-2007, 09:00 PM

Thanks a lot.

Your tips are very appreciated.

daveart · 10-26-2007, 06:47 PM

im sorry but there is no filter in the tranny,if you touched something in there well,,

hurl · 10-29-2007, 12:34 PM

Quote:

Originally Posted by daveart

im sorry but there is no filter in the tranny,if you touched something in there well,,

Um yeah there is filter in the tranny.

Anyway....

Everything is checking out as normal. Wires and Solenoid are fine. I would find it hard to beleive that the ECM would go and by chance out of all the problrem it could have it would just happpen to be a tranny code 1000 miles after a fluid changes.

So now I'm wondering if a clogged passage in the Valve body could cause this code? In my reading I would think not since the ECM controls the SLN solenoid based on reading from other sensors and I do not have codes for those other sensors.

Any Guesses?

Thanks!

***toyomoho*** · 10-29-2007, 12:38 PM

Could also be the valve itself.

dc_98_cam · 10-29-2007, 02:17 PM

Find a used ECU at a salvage yard ... same year, engine. Might not be too expensive.
Would give you some insight as to where to look for the problem ... maybe.

daveart · 10-29-2007, 02:46 PM

no there is no filter there is a strainer that yoiur nor supposed to touch but no filter,im looking at the scymatics right now,no filter sorry ive replaced pans almost everyday at the dealership,so if your trying to tell me there is a filter and dont want to listen to what i have to say then your on your own,NO FILTER IN THE TRANSMISSION,if you say yes then sorry but you have no idea what your doing,go bring it to the tranny shop before it costs you more

daveart · 10-29-2007, 02:49 PM

Quote:

Originally Posted by hurl

Um yeah there is filter in the tranny.

anyways

Everything is checking out as normal. Wires and Solenoid are fine. I would find it hard to beleive that the ECM would go and by chance out of all the problrem it could have it would just happpen to be a tranny code 1000 miles after a fluid changes.

So now I'm wondering if a clogged passage in the Valve body could cause this code? In my reading I would think not since the ECM controls the SLN solenoid based on reading from other sensors and I do not have codes for those other sensors.

oh there is huh.well you must show me and the other 20 techs at this dealership where it is,a strainer is not a filter and should not have been replaced,you dont belive me call your local dealership

anyways,
bring the car to a tranny shop and save your money and headach,
holy crap etas says no filter but you must be right ,im not saying i know it all but pleas dont tell me there is a filter in the tranny,cause there isnt
Any Guesses?

Thanks!

daveart · 10-29-2007, 02:56 PM

the problem is going to be the shift solinoid
INSPECTION PROCEDURE
1 Check shift solenoid valve SLN.
PREPARATION:

Disconnect the shift solenoid valve SLN connector.

CHECK:

(a) Measure resistance between terminals 1 and 2 of solenoid
connector.
(b) Connect positive

lead with an 8 ~10 W bulb to terminal
1 of solenoid connector and negative lead to terminal
2, then check the movement of the valve.

OK:
(a) Resistance: 5.1

~ 5.5 W

(b)

When battery positive voltage is applied.
Valve move in direction in illustration.
(on the left)
When battery positive voltage is cut off.
Valve move in direction in illustration.

(on the right