Diagnostic Aids
Tech 1 has the ability to command shift solenoids and TCC PWM on and off. A faulty connection or an open circuit can result in setting Code 29. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connections or damaged harness.
Perform intermittent check by monitoring circuit and code status while wiggling related wiring and connectors. If failure is induced, monitored circuit status will change rapidly and/or related code will set.