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Speed Sensors and ATF+4 and the like

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 #232110  by grayslater
Due to the many related transmission issues of late, I was reading the TRANSMISSION DIAGNOSTIC PROCEDURES Manual and the first step in testing all fault codes is the following:

NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low, locate and repair the leak then check and adjust the fluid level.
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.

With the DRBIII, read engine DTCs. Check and repair all engine DTCs prior to performing any transmission symptom diagnostics.
With the DRBIII, read transmission DTCs. Record all DTCs and 1 trip failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for P0706 Check Shifter Signal.
For Gear Ratio DTCs, check and record all CVIs.
Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.
NOTE: Verify flash level of Powertrain Contorl Module (PCM). Some problems are corrected by software upgrades to the transmission and engine software.