Question1994 Camry V6 A541 Trans 165K miles
Symptom - Will not downshift to 1st gear when stopped.
Trouble code P0753 - Replaced both solenoids- no immediate change but over the past two months the shifting has improved to 90%.
Installed monitors on solenoid #1 and #2 lines from ECU to Trans. This monitor displays the presence of voltage on the lines.
When the transmission if functioning correctly (90% of the time) the shifting indicates Solenoid#1 on in 1st. Both on in 2nd, #2 on in third and both off in OD. During this time the check engine light is extinguished.
When the trans does not shift I shift the gears manually. The following indications are:
In drive or park, only solenoid #2 is active. In drive this occurs with or without the engine running.
When shifting from neutral to drive I see solenoid #1 flicker before solenoid #2 activates.
In normal operation what signals the ECU to set solenoid #1 on and #2 off dor 1st gear?
To pinpoint the problem, what signal(s)cause the transmission to switch #1 off and #2 on indicating the "fail safe mode" is invoked?
AnswerMost of the time when we run into solenoid trouble codes the solenoids are not the problem it is usually due to transmission failure which causes metal particles to clog up the small openings of the solenoids.
Remove the transmission oil pan and closely check for any metal particles or clutch material in the oil.
