Computer Relearn Procedures: Overview Dodge Pickup R1500

Description

Automatic Temperature Control (ATC) module must be reset or recalibrated each time a door actuator is replaced or when ATC module is replaced. It is necessary for ATC module to learn feedback voltage values for each door stop position for all doors in front HVAC unit housing and rear HVAC unit housing. If an actuator blend door, mode door, or if recirculation door, or door actuator are out of calibration, ATC system will not perform at maximum efficiency.

1. Turn the ignition switch to the ON position. Simultaneously depress and hold the Power and Recirculation buttons on the heater-A/C control for at least five seconds. The manual heater-A/C control power Light Emitting Diode (LED) and Recirculation LED, or the Automatic Temperature Control (ATC) heater-A/C control Delay and Recirculation graphics will begin to flash when the calibration procedure has begun.
2. The calibration procedure should take less than two minutes to complete, for the manual heater-A/C control, and less than twenty seconds for the ATC heater-A/C control. When the LEDs or graphics stop flashing, the calibration procedure is complete.
3. If the LEDs or graphics continue to flash beyond the normal three minute (manual) or twenty second (ATC) calibration time, it indicates, that the heater-A/C control has detected a failure and a Diagnostic Trouble Code (DTC), has been set. Use a DRBIII® scan tool to perform further diagnosis.
4. The LEDs or graphics will continue to flash, even after the ignition switch is cycled Off and On, until a successful calibration is completed or until the vehicle has been driven about 8 miles. For diagnostic procedures for calibration test failure, see SELF-DIAGNOSTIC SYSTEM in appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

The transmission output speed signal supplies distance pulses to the control module in order to provide the appropriate distance pulses for the other vehicle systems. The pinion factor is programmed into the control module at the assembly plant.

The nature of the electronic pinion factor requires that certain features must be taken into consideration.

1. If no pinion factor is stored in an installed control module, the vehicle speedometer will not operate, engine speed will be limited to 2300 RPM and catalyst damage may occur.
2. Selecting a wrong tire size will cause the speedometer to be inaccurate and will also cause any speed related features to operate improperly.

Using the following steps, the pinion factor can be checked and/or reset using the DRBIII®

1. Select TRANSMISSION system, then MISCELLANEOUS FUNCTIONS, then PINION FACTOR. The DRBII® will display the current tire size.
2. If tire size is incorrect, press the ENTER key and then select the correct size.
3. Press the PAGE BACK key to exit the reset procedure.

The Transmission Control Module (TCM) employs a strategy which modifies Torque Converter Clutch (TCC) operation. This strategy conditions the TCC disc for optimum converter clutch engagement and feel throughout the life of the transaxle. The cycle inhibits Full Electronically Modulated Converter Clutch (FEMCC) until six hours of Partial Electronically Modulated Converter Clutch (PEMCC) operation have taken place, or the vehicle has been driven 3750 miles. The cycle automatically terminates when either the time or mileage has been achieved, however, the mileage may vary slightly from vehicle to vehicle. The TCC break-in cycle must be restarted using the DRBIII® scan tool, and upon the following

1. Replacement of TCM on vehicle with less than 3750 miles or less than 6 hours of PEMCC operation.
2. Replacement of torque converter assembly at any vehicle mileage.

This procedure is used to properly condition TCC to prevent shudder during clutch engagement. Break-in procedure must be used if torque converter is replaced at any vehicle mileage, or PCM is replaced with vehicle mileage less than 3750 miles.

Break-In Procedure

Connect scan tool to data link connector located below instrument panel, near steering column. Follow scan tool prompts to TCC BREAK-IN, in the TRANSMISSION CONTROL MODULE/MISCELLANEOUS section. View or Start procedure as commanded by scan tool.