GasSavers_bobski |
07-19-2009 08:00 AM |
Quote:
Originally Posted by Whitetoy
(Post 137111)
1 - It has 2 lockup solenoids, what is the extra one for?
2 - How can I confirm that the solenoids are doing their thing
at the right time?
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1: Are you sure it's a '91? '92+ Civics have two or more solenoids but '88-91 models (with the exception of the automatic AWD wagon) should only have one. Before your train of thought runs off down that path, it's fairly difficult to swap a '92+ transmission into an '88-91 Civic due to significant changes in engine/transmission mounting points. I guess some non-US market '88-91 transmission may have gotten two solenoids - there is certainly a space machined on my old '91 trans case for a second solenoid valve.
To answer your question, the second solenoid allows for a few stages of 'partial lockup'. I'm not sure what value those partial stages have... smoother shifting or more efficient torque transmission under certain conditions perhaps?
2: To actually check if the valves are doing what they should, you would need to purchase an automatic transmission pressure gauge set and connect it to the proper service ports on the transmission. Other than that, you can do electrical tests. A factory service manual for whatever car the transmission came from should describe the on/off patterns for various operating conditions. If there is a significant electrical problem such as a burnt out or shorted out solenoid coil or similarly damaged wire, the ECU should throw a diagnostic code.
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