DTC Code P1765

[SBCelicaGT]

So I came across this forum from a camry owner. I hope you all can help me out. I have a 1990 Celica with a 1997 Avalon engine in it. Its mated to a 2000 Solara e153 tranny.

Im having the usual DTC codes indicating the missing shift solenoids. I have been able to cancel all of them but P1765. This website:

http://www.enginemate.com/Toyota%20dtcs%20list.htm

describes the code as:

Linear Solenoid for Accumulator Pressure Control Circuit Malfunction

so I did some searching and reading it it looks like it is referencing solenoid number 4. For those of you with a wiring diagram for the camry/avalon/etc. number 4 solenoid connects to the SLN- and SLN+ pinouts on the ECU. In the service hints area it says that solenoid 4 where it connects to SLN+ needs to read between 11 and 15 ohms. So I set up resistors to handle that.

It didnt change anything. I figured it was the SLN connections from Chiltons manual. Under P1765, it states:

Defective Shift Solenoid Valve SLN, an open or a short in the shift solenoid valve SLN circuit or PCM malfunction

I believe that this code is only prevalent on 97 or later model cars.

Can anyone help me out at all?

[SBCelicaGT]

Here is the solenoid in question from the avalon wiring diagram:



Noting the numbers on the solenoid, the service hint area says that 1,2,6 should be grounded each with a resistance of 11-15 ohms.

So I connected 4 resistors. One for each shown in the picture. so 6, 3, 2 I connected one end of the resistor and the other end I grounded. for 1 and 4, I connected a resistor in between the two connections.

I used 15 ohm 25W resistors for all 4. Solenoid 1 which is the pink wire(3) didnt like that resistance so I did some rearranging and obtained 11.2ohms and the code went away.

However, I can't seem to get rid of this P1765. From various lists I get that this code refers to:

Linear Solenoid for Accumulator Pressure Control Circuit Malfunction
or
Defective Shift Solenoid Valve SLN, an open or a short in the shift solenoid valve SLN circuit or PCM malfunction
or
Trans 12 Volt Supply Relay Control Circuit

so this has to do with that number 4 solenoid circuit given that the second description mentions SLN and the number 4 solenoid connects to SLN+ and SLN- on the ECU.

busting out the multimeter I found that the SLN- connection is grounded and has a resistance of about 11.4ohms.

I also found out that if i directly connected SLN+ to SLN- the code would go away untill about 30 seconds into a driving interval and then pop up. So then I thought well maybe I could connect the two wires and then ground that connection since the service hint mentioned that SLN+ needed to be grounded. no luck. it still comes on about 30 seconds into driving the car.

So thats where I am at now. I've exhausted every idea I can come up with at this point.