Re: 164LS auto tranny problem Diagnosis Part 1

[Bernie Bennett <bennetts77833@domain.elided>]

Graham:

Part 2 is read the Below referenced electrical diagnosis but first --

The service manual section Automatic Transmission diagnosis tree 
describes a problem "Impossible to engage the 2nd or 3rd speed or the 
Direct Drive D" (which I presume means transmission wont engage that 
gear not shift lever??? I don't see any other diagnosis which even 
sounds like what you describe:)

The Proposed diagnosis is Table E which has two steps:

E1 Speed gear insertion control cable check -- Check that the speed gear 
control cable is correctlly adjusted -- if OK goto E2
(Not adjusted correctly) -- Adjust the cable.

E2  Check the oil for correct level (Auto Transmission Oil Level 
presumeably)  -- If ok --  " Should the fault recur, refer to the 
"WIRING DIAGRAM AND ELECTRICALDIAGNOSIS  MANUAL" ; if the fault is still 
recurring, proceed  to the replacement of the gearbox complete ass(embl)y.

(Oil level not OK) -- Top up to correct level with prescribed oil.

__________________________________________________________________

The "WIRING DIAGRAM AND ELECTRICAL DIAGNOSIS  MANUAL" is facinating 
reading, we need to do the conversion routine talked about in the digest 
so you may read it yourself to understand how your transmission works;

but my quick rereading of pps. 236 and 237 indicates when second gear 
is engaged solenoid valves MV2 and MV1 are activated. When third gear is 
engaged MV1 only is activated and in Direct (Fourth) no solenoid valves 
are activated. So it is conceivable you might have a sticking MV1 or an 
problem which causes your electrical system to fail to deactivate the MV1.

The manual also says the"... MV solenoid valves have a typical winding 
resistance of aprox. 33.5 Ohm and an inductance of less than 500 mH."
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