Flashcode engie1/7/2024 ![]() Enabling conditions: No engine or transmissions codes are present, vehicle speed was under 70 MPH, TPS was under 33% open. Her is the definition and a list of possiable causes.Ĭode P1740-Torque converter clutch did not lock up when the PCM sent the command. May flash transmission control indicator lamp.ĭiagnostic Trouble Codes: 452, P0500, P1500, P1501, P0503 Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, unexpected downshifts may occur at closed throttle, abnormal torque converter clutch operation or engages only at wide-open throttle (WOT). Used as an input in determining shift scheduling and electronic pressure control. This signal tells the powertrain control module the vehicle speed in miles per hour (mph). ![]() The PSOM processes this input signal information and relays it to the powertrain control module and the speed control module. Programmable Speedometer/Odometer Module (PSOM):ĭescription: The programmable speedometer/odometer module receives input from the rear brake anti-lock sensor, which is mounted on the rear axle differential housing. Any reference to intermediate brake drum or direct clutch cylinder are one and the same. First gear is commanded in the 1 range at start-ups and when downshifted into 1 range below approximately 56 km/h (35 mph) (for diesel 48 km/h ). Second gear is commanded when the gearshift selector lever is in the 2 range and when downshifted into the 1 range at speeds above approximately 56 km/h (35 mph) (for diesel 48 km/h ). Manual gear selection is available in the 1 and 2 range. Whenever the ignition switch is turned on, the vehicle will automatically provide overdrive operation regardless of the switch position the last time the vehicle was running. The transmission control switch, located on the vehicle's shift lever disables overdrive operation and enables automatic operation through the first three gears. In the (D) range, automatic operation of all four gears is possible. This state is commanded to the transmission solenoid body. ![]() They are calibrated to provide the optimal transmission state. Transmission shift selection and torque converter clutch operation are controlled by the PCM. This mechanical coupling helps improve fuel economy and wide-open throttle performance by eliminating converter slip. The application of the piston plate effectively replaces the hydraulic coupling between the converter cover and the turbine with a mechanical coupling between the converter cover and the turbine hub. The power input is controlled by the application of the torque converter clutch, which is scheduled through the powertrain control module. The input shaft transfers power into the transmission gearset. The flow from the pump is proportional to engine rpm, and excess pump capacity is exhausted back to the pump inlet. The impeller hub provides engine rpm to the positive displacement pump. The powertrain control module compares these conditions with electronically stored parameters and logically determines how the transmission should operate.Ī torque converter (7902) couples the engine to the transmission gearset via the input shaft (7017) and the torque converter impeller hub. Operating conditions are relayed to powertrain control module by various sensors throughout the vehicle. Transmission gear selection in the (D) range and converter clutch operation is controlled by the powertrain control module (PCM) (12A650). The main operating components of the E4OD transmission include a torque converter clutch, six multiple-disc friction clutches, one band, one sprag one-way clutch and two roller one-way clutches that provide for the desired function of three planetary gear sets. The E4OD transmission is a fully automatic, electronically controlled, four-speed unit with a torque converter clutch.
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