Dodge Durango

 Service Manual

Transmission and Transfer Case » Diagnosis and testing
Overdrive electrical controls

The overdrive off switch, valve body solenoid, case connectors and related wiring can all be tested with a 12 volt test lamp or a volt/ohmmeter. Check continuity of each component when diagnosis indicates this is necessary. Refer to Group 8W, Wiring Diagrams, for component locations and circuit information.

Switch and solenoid continuity should be checked whenever the transmission fails to shift into fourth gear range.

Automatic transmission diagnosis

Effects of incorrect fluid level

Causes of burnt fluid

Fluid contamination

Preliminary diagnosis

Park/neutral position switch

Overdrive electrical controls

Gearshift cable

Road testing

Analyzing road test

Hydraulic pressure test

Air testing transmission clutch and band operation

Converter housing fluid leak diagnosis

Diagnosis tables and charts-re transmission