48RE. Updates CHRYSLER 201

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Lester Snow
5 years ago
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1 CHRYSLER 201 Updates Beginning in 2005 there were changes made in the applications. These changes included: A new case with two extra bosses to except a Throttle Actuator Motor (Diesel Applications) Software changes in the Tow/Haul Strategy

202 CHRYSLER Throttle Valve A ctuator The transmission Throttle Valve Actuator (TTVA) is a new motor/actuator that is mounted to the side of the transmission case and used to drive the throttle shaft.

2 202 CHRYSLER Throttle Valve A ctuator The transmission Throttle Valve Actuator (TTVA) is a new motor/actuator that is mounted to the side of the transmission case and used to drive the throttle shaft. This component eliminates the previous under hood actuator and linkage. The Transmission case had 2 bosses added to the side for the actuator to mount to. The detent feel was removed from the valve body and the throttle shaft was made 2 mm longer. The change was required for Diesel applications only. The V10 transmission will not have the actuator. The new transmission will not service past designs. The TTVA has a six pin connector, that supplies 12 volts to drive a motor from the Cummins engine controller and uses 2 feedback potentiometers to report position back to the controller to identify the correct position. The TTVA consists of an electric DC motor, tow potentiometers, and a gear drive system. The TTVA is mechanically connected to the transmission throttle valve in the valve body by the D shaped o pening n the pottom of the TTVA shaft. Changes in the TTVA position are therefore transferred to the throttle valve and cause changes in the transmission throttle pressure. All changes in the throttle valve position are controlled by the Engine Control Module (ECM)

3 CHRYSLER 203 Adjustments The Transmission Throttle Valve Actuator (TTVA) does not require any mechanical adjustments. All changes in throttle valve position are controlled by the Engine Control Module (ECM). The TTVA does require an initialization period after the actuator has been removed or replaced. After the actuator has been removed or replaced, move the ignition to the ON position for thirty (30) seconds. This will allow the ECM sufficient time to perform the internal calibration procedures to learn the TTVA s current zero position. Once this is done, check the ECM for diagnostic trouble codes (DTCs). If no DTCs are set relating to the TTVA, the TTVA is fully calibrated and ready for use.

4 204 CHRYSLER Transmission Throttle Valve Motor Circuit The motor circuit reverses polarity to drive the transmission throttle TTVA) shaft to either the full (TTV) shaft position or the closed TTV shaft position. The TTVA connector pin 5 is the Pulse Width Modulated side of the motor circuit. The motor circuit is completed through Pin 3. Most of the time, circuit polarity causes the actuator motor to either move the TTV shaft to full throttle position or hold the TTV shaft in the closed throttle position against spring tension. To do this, Pin 3 is grounded and Pin 5 is powered. To reverse the motor and rapidly change the position of the TTV shaft, the circuit reverses polarity. Pin 3 supplies 12V and Pin 5 supplies ground.

CHRYSLER 205 Transmission Throttle Valve Potentiometer Two potentiometers are built into the TTVA body and provide two tranmission throttle valve shaft position signals to the PCM.

5 CHRYSLER 205 Transmission Throttle Valve Potentiometer Two potentiometers are built into the TTVA body and provide two tranmission throttle valve shaft position signals to the PCM. Two sensors are used for failsafe redundecy and error checking. The sensors output analog signals to inform the PCM that the TTV shaft moves as expected. Two three-wire potentiometer sensors are used. The sensors use a common 5V reference and sensor return. Each sensor ouputs and analog signal in proportion to TTV shaft position, but one sensor uses reverse logic. As the TTV shaft rotates to full throttle, the signal voltage from potentiometer #1 increases, and the signal voltage from potentiometer #2 decreases. The sum of the two potentiometer signal voltages should always qual approximatly 5V. the PCM monitors this value to check the system integrity.

6 206 CHRYSLER TTVA Transmission Cicuit Diagram

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1 of 9 9/18/2017, 10:09 AM DTC P0505 IDLE AIR CONTROL VALVE (IACV) - AUXILIARY AIR CONTROL (AAC) VALVE Description SYSTEM DESCRIPTION This system automatically controls engine idle speed to a specified