Oil temperature warning light flashing after engine head gaskets replaced

Car: Subaru, Outback, 2000, 2.5 - Back to Fix-It - Subaru Repair Manuals

Q.2000 Subaru outback 2.5 --at oil temperature warning light flashing after engine head gaskets replaced?
also check engine light came on a short time later. Car runs fine but tranny not shifting right.
Car has automatic tranny and when starting out there is a clunk at around 5mph and does not seem to want to go into overdrive. Trouble shooting shows the dropping resistor not in spec., sometimes 13 ohms and other 17-20.
Should I replace this or what do you thing it is?

I already checked/done: checked all conections. Seems intermitent, at temp light flashes constently but sometimes it wont flash just after start up but sonn after it will flash and check engine light comes on also.

More Info required Was the transmission jacked up using the oil pan as the jacking point? Is it bent at all?

Addition No, the oil pan was not used as the jacking point. I read somewhere that there could be two wires that did not get reconnected under the hood passanger side as that happened to him and it fixed the problem. I can not find any unconnected wires, what might they be?

Answer Let me give you the diagram for the wiring of the transmission,
HOW TO READ TROUBLE CODE OF INDICATOR LIGHT
The AT OIL TEMP indicator light flashes the code corresponding to the faulty part.
The long segment (1.2 sec on) indicates a "ten". and the short segment (0.2 sec on) signifies a "one".

TO EXTRACT CODES:
Warm up the engine.
Turn the ignition switch OFF.
Turn ignition switch ON.
Check if the indicator light comes on.
YES: Go to step 5
NO: Repair faulty indicator circuit.
Drive vehicle at speeds greater than 20 km/h (12 MPH).
Stop vehicle, turn ignition switch OFF.
Turn ignition switch ON.
Move selector lever to 1 position
Turn ignition switch OFF.
10 Turn ignition switch ON.
Move select lever to 2 position.
Move selector lever to 1 position
Move select lever to 2 position.
Move select lever to 3 position.
Move select lever to D position.
Ensure that indicator light blinks.
Indicator light blinks at 4-Hz intervals (every 0.125 second until ignition switch is turned OFF.
Faulty battery.
Indicator light blinks at 2-Hz intervals (Blinks every 0.25 seconds (until ignition switch is turned OFF).
Normal
Trouble code is outputted.
Check problem corresponding with trouble code.
Indicator light remains illuminated.
Check inhibitor switch, wiring, TCM, etc.
This procedure lets you know what the transmission module is seeing that it dosen't like.
Count the flashes, long flash then two short flashes will be the number 12 and so on.

The transmission is in the box to the left and there is a connector at the top of the trans by the dogbone mount that may have gotten crushed. Be sure there are NO dents in the transmission oil pan as this will cause this condition. Let me know what codes the overdrive light is flashing and we will work from there.

Addition DTC P0748 - PRESSURE CONTROL SOLENOID (LINE PRESSURE DUTY SOLENOID) ELECTRICAL
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Excessive shift shock
CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.
NOTE: Check line pressure duty solenoid circuit.
We did a check and the dropping resistor is not in spec. Goes from 13ohm and the next time 17 and the next 20. Was told to replace that. What's your take?

Answer If you unplug the transmission connector and measure cavity 5 in the connector with a red wire going to the transmission how many ohms to ground?
What kind of scanner did you pull the code with and what does the trans light flash for code?
Once again, if the trans pan was jacked against the pressure control solenoid is located directly above the pan magnet with very little clearance and if the magnet touches the solenoid it will result in this code.

Answer The spec I have for the dropping resistor is 9 - 17 ohms. I think the resistance of the solenoid on the red wire in cavity 5 will be out of range and you will be dropping the trans pan to repair the connector or replace the pressure control solenoid.

Let me know what you find

Addition What is the resistance of the pressure control solenoid suppose to be? Replaced the dropping resitor and did not help. Cleared the code and AT temp. Light did not flash until given gas.

Answer No the dropping resistor is in spec so it will not need replacement. The pressure control solenoid regulates the line pressure in the main fluid circuit to improve shift quality. When you increase revolutions of the fluid pump the pressure will go up if not controlled. When the transmission control module cannot control the pressure it flags the solenoid as out of range. The spec for the resistance from cavity 5 (the red wire) is 2.0 - 4.5 ohms. You will not be able to Acuratly measure this without a good meter.
What code does the temp light flash?
What scanner are you using?
What is the resistance between cavity five and ground?

Addition blink code : 75
No ( 0 ) continuity on the red wire.
Used a Snap On scanner.

Addition Blink code is 75. No continuity on the red wire. Used a Snap On scanner.

Answer If you have no continunity or max ohms reading from cavity five to ground the solenoid "C" (pressure control) or its connector will have to be replaced. Take the trans pan off to check which you need. You should be able to see the damage.

Addition Is grounding at the tranny case good enough or should I go into the ground through the harness? Through the harness I have continuity but from Solenoid to ground 0. There is no damage at either the harness or Solenoid.

Answer Go to pin Cavity #16 to be sure

Addition Still 0.

Addition Still no continunity on pin Cavity #16.

Answer Ok then you need to drop the pan and look at the solenoid and its connector directly above the pan magnet

Addition What is the oe part number for the solenoid "C" (pressure control)?

Answer I do not have acess to Subaru parts catalog but the solenoids are available as this is a common problem. Check the harness closely for any wear also

Addition Ordered the part, wont get it till Friday. Will let you know if it fixes the problem. Thanks, Brian.

Answer Ok great I will be standing by

Addition The solenoid "C" (pressure control) fixed the problem. Just seems strange it would go out right after the head gaskets were changed. Thanks for all your help! Brian.

Addition The solenoid (pressure control) fixed the problem. Just seems strange it would go out right after the head gaskets were changed. Thanks for all your help! Brian.

Answer I am glad to help. Come back if you have any more questions I can help you with

Addition The floor shifter light does not light up now. Worked for a short time after the previous problem was fixed. Is there a bulb that needs to get replaced or does something need to get plugged back in? If so, how is it done? Thanks.

Answer The illumination for the shifter is run out of the cig lighter. There has never been a diagram for an A/T shifter it is always a M/T shifter. Try connector i24 and i25 in this diagram beyond that I would have to go looking for the problem by verifying power and ground to the bulb. I did not get this question until just now as it was closed earlier so I am sorry I did not get back to you right away.
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Make sure someone didn't dump a Coke down there in the past it does all sorts of weird things.

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Oil temperature warning light flashing after engine head gaskets replaced