Theory of Operation
The Transmission Control Module (TCM) receives a engine RPM over the CAN bus. If the engine RPM exceeds a predetermined value a DTC will set.
The transmission Control Module monitors ignition voltage. If the Monitored voltage drops below a predetermined voltage, this DTC will set?
The transmission Control Module monitors ignition voltage. If the monitored voltage rises above a predetermined voltage this DTC will set.
The Transmission Control Module (TCM) monitors the brake switch 3 signal over the CAN Bus from the Totally Integrated Power Module (TIPM). If the Transmission is shifted into Drive position without confirming that the brake was depressed before the shift, a DTC will set.
After initial vehicle start, the Transmission Control Module (TCM) looks for a message over the CAN BUS verifying vehicle information which is crucial for transmission configuration. After the information is received it is stored in the EEPROM of the TCM. If the TCM does not receive a valid configuration within a predetermined time, the DTC will set and the MIL will be illuminated.
The Transmission Control Module (TCM) stores in its EEPROM vehicle information data transmitted over the CAN Bus from the FCM/TIPM. If the stored information in the TCM does not match the information obtained over the CAN Bus, the DTC will set.
A common 5-volt power supply is used by both the primary and secondary pressure sensors as well as an internal ROM Assembly. If the power supply does not maintain a predetermined voltage range to the pressure sensors after the period of 5.0 seconds, the Transmission Control Module (TCM) sets the DTC and illuminates the MIL.
The Transmission Range Sensor (TRS) has a contact point for each shift lever position. The Transmission Control Module (TCM) monitors the signal from the TRS which specifies the shift lever position. The TCM also broadcast the shift lever position over the CAN BUS to other modules.
The Transmission Range Sensor (TRS) has a contact point for each shift lever position. The Transmission Control Module (TCM) monitors the signal from the TRS which specifies the shift lever position. The TCM also broadcast the shift lever position over the CAN BUS to other modules.
The Transmission Control Module (TCM) monitors the Transmission Temperature Sensor Signal circuit for voltage changes within desired limits. The TCM calculates the transmission fluid temperature from the temperature sensor signal voltage. This value is used in conjunction with various other inputs to calibrate different operating modes such as Torque Converter lock-up and Torque reduction.
The Transmission Temperature Sensor is a thermistor that changes resistive value when subject to different temperatures. When the monitored voltage rises, the calculated temperature decreases.
The Transmission Control Module (TCM) monitors the Transmission Temperature Sensor Signal circuit for voltage changes within desired limits. The TCM calculates the transmission fluid temperature from the temperature sensor signal voltage. This value is used in conjunction with various other inputs to calibrate different operating modes such as Torque Converter lock-up and Torque reduction.
The Transmission Temperature Sensor is a thermistor that changes resistive value when subject to different temperatures. When the monitored voltage rises, the calculated temperature decreases.
The Transmission Control Module (TCM) monitors the Transmission Temperature Sensor Signal circuit for voltage changes within desired limits. The TCM calculates the transmission fluid temperature from the temperature sensor signal voltage. This value is used in conjunction with various other inputs to calibrate different operating modes such as Torque Converter lock-up and Torque reduction.
The Transmission Temperature Sensor is a thermistor that changes resistive value when subject to different temperatures. When the monitored voltage rises, the calculated temperature decreases.
The transmission system uses two speed sensors. One is used to measure input rpm (primary pulley) and one to measure output rpm (secondary pulley).
The Input Speed sensor detects the primary pulley rpm by the use of a three-wire magnetic pickup devices that generates a square wave signal as rotation occurs and is monitored by the Transmission Control Module (TCM). These inputs are essential for proper transmission operation.
The transmission system uses two speed sensors. One is used to measure input rpm (primary pulley) and one to measure output rpm (secondary pulley).
The Input Speed sensor detects the primary pulley rpm by the use of a three-wire magnetic pickup device that generates a square wave signal as rotation occurs and is monitored by the Transmission Control Module (TCM). These inputs are essential for proper transmission operation.
The transmission system uses two speed sensors. One is used to measure input rpm (primary pulley) and one to measure output rpm (secondary pulley).
The Input Speed sensor detects the primary pulley rpm by the use of a three-wire magnetic pickup device that generates a square wave signal as rotation occurs and is monitored by the Transmission Control Module (TCM). These inputs are essential for proper transmission operation.
The transmission system uses two speed sensors. One is used to measure input rpm (primary pulley) and one to measure output rpm (secondary pulley).
The Output Speed sensor detects the secondary pulley rpm by the use of a three-wire magnetic pickup device that generates a square wave signal as rotation occurs and is monitored by the Transmission Control Module (TCM). These inputs are essential for proper transmission operation.
The Transmission Control Module controls the gear ratio by the use of a Step motor that transfers electrical power to mechanical movement. The rationality is a continuous test that monitors the Step motor movement. If the Step motor is stuck at a certain position, the estimated ratio is increased or decreased continuously by the feedback value of the primary pulley speed difference. When the difference between the estimated and actual primary pulley speed has reached 1000 rpm, a DTC will set.
The Transmission Control Module (TCM) monitors the Torque Convertor Clutch for slippage using a calculation derived from turbine revolution (input speed) and engine rpm broadcast over the CAN C BUS. If the slip value exceeds a predetermined value the DTC will set.
The Line Pressure Solenoid regulates the Line Pressure (Oil Pump discharge pressure) which is controlled by the Transmission Control Module (TCM). If the line pressure does not reach at the desired pressure due to driving conditions, the possibility of belt slippage can occur. The gear ratio changes to a value beyond the maximum gear ratio which is a calculation between the Primary Pulley speed and the Secondary Pulley speed. If the gear ratio exceeds a predetermined limit a DTC will set.
The Transmission Control Module (TCM) monitors the secondary line pressure (secondary pulley pressure) from the secondary pressure sensor. The TCM compares the actual secondary line pressure to the target (desired) line pressure. Failure to match the target line pressure over a given time will set the DTC.
The Transmission Control Module (TCM) monitors the secondary line pressure (secondary pulley pressure) from the secondary pressure sensor. The TCM compares the actual secondary line pressure to the target (desired) line pressure. Failure to match the target line pressure over a given time will set the DTC.
The AutoStick function allows the driver to manually change the gear ratio to a locked ratio. The Transmission Control Module (TCM) monitors the AutoStick Upshift and Downshift circuits. If the TCM receives an Upshift and Downshift request simultaneously, or manual mode Upshift/Downshift request while other than in the D-Range, a DTC will set.
The Transmission Control Module (TCM) monitors the input voltage from the primary pulley pressure sensor. When the voltage is below a predetermined limit a DTC will set.
The Transmission Control Module (TCM) monitors the input voltage from the primary pulley pressure sensor. When the voltage is above a predetermined limit a DTC will set.
The Transmission Control Module (TCM) monitors the input voltage from the secondary pulley pressure sensor. When the voltage is below a predetermined limit a DTC will set.
The Transmission Control Module (TCM) monitors the input voltage from the secondary pulley pressure sensor. When the voltage is above a predetermined limit a DTC will set.
The Transmission Control Module (TCM) regulates the line pressure by pulsing the line pressure solenoid. The TCM monitors the line pressure solenoid voltage and current draw during operation.
The Transmission Control Module (TCM) regulates the line pressure by pulsing the line pressure solenoid. The TCM monitors the line pressure solenoid voltage and current draw during operation.
The Transmission Control Module (TCM) regulates the secondary pressure by pulsing the secondary pressure solenoid. The TCM monitors the secondary pressure solenoid voltage and current draw during operation.
The Transmission Control Module (TCM) regulates the secondary pressure by pulsing the secondary pressure solenoid. The TCM monitors the secondary pressure solenoid voltage and current draw during operation.
The Transmission Control Module (TCM) calculates the checksum in the EEPROM and compares it to the stored checksum value. If the calculated checksum value does not match the stored checksum value the TCM sets the DTC and illuminates the MIL.
The Oil Temperature Sensor , Primary and Secondary Oil Pressure Sensor and the Input Speed Sensor use a common ground circuit that returns to the Transmission Control Module (TCM). If all of these circuits show an open (high voltage) the DTC will set.
The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If there is no stored hydraulic calibration stored in the TCM this DTC will set. It takes one failure to turn on the MIL.
During the initial ignition on, the Transmission Control Module (TCM) receives the calibrated data from the EEPROM assembly inside the transmission and stores this information in the EEPROM of the TCM. At every ignition on, the TCM compares the stored data in the EEPROM to the transmitted data from the EEPROM in the transmission. If the calibration data does not match the DTC will set and the MIL will illuminate after one failure.
The Transmission Control Module (TCM) monitors the correlation between the primary and secondary pressure sensors. If the correlation between the sensors is out of range a DTC will set.
The Transmission Control Module (TCM) monitors the TCC ON/OFF Solenoid Control signal during normal operation. If the TCC ON/OFF Solenoid status does not match the TCM requested ON/OFF status a DTC will set.
The Transmission Control Module monitors and controls the gear ratio by the use of a Step motor that transfers electrical power to mechanical movement. The rationality is a continuous test that monitors the Step motor movement. If the Step motor ON/OFF status does not match the TCM requested ON/OFF status a DTC will set.
The Transmission Control Module (TCM) monitors the Torque Convertor Clutch for temperature during normal operation. To protect the CV Transmission from a hot temperature condition, the TCM monitors the continuation time of stall speed condition. If the monitored time is more than a predetermined value, this DTC will set causing the TCM to change the allowable engine output torque and illuminating the Over Temperature lamp.
The TCM receives the On/Off-road signals from All Wheel Drive control module (AWD) and the Totally Integrated Power Module (TIPM) over the CAN BUS. If the signals from AWD and TIPM do not match, this DTC will set.
The Transmission Control Module monitors two signals from the TCC Solenoid during normal operation. One is the feedback electric current of the TCC Solenoid and the other is the voltage between ground and the TCM termination for the TCC Solenoid.
The Transmission Control Module monitors two signals from the TCC Solenoid during normal operation. One is the feedback electric current of the TCC Solenoid and the other is the voltage between ground and the TCM termination for the TCC Solenoid.
The Controller Area Network (CAN) is a high speed serial communication line for multiplex communication between multiple controllers that reside on the network. The Transmission Control Module monitors the transmit and receive message from the CAN BUS.
The Controller Area Network (CAN) is a high speed serial communication line for multiplex communication between multiple controllers that reside on the network. The Transmission Control Module monitors the transmit and receive message from the CAN BUS.
The Controller Area Network (CAN) is a high speed serial communication line for multiplex communication between multiple controllers that reside on the network. The Transmission Control Module monitors the transmit and receive message from the CAN BUS.
The Controller Area Network (CAN) is a high speed serial communication line for multiplex communication between multiple controllers that reside on the network. The Transmission Control Module monitors the transmit and receive message from the CAN BUS.
The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If the TCM can not read the external EEPROM in the transmission this DTC will set. It takes two consecutive failures to turn on the MIL.
The Transmission Control Module (TCM) receives two throttle position related signals over the CAN Bus. One is the throttle pedal position and the other is a throttle pedal position toggle bit. When the Toggle signal pattern is out of range from a predefined signal pattern a DTC will set.
The Transmission Control Module (TCM) receives Engine rpm over the CAN Bus.
During the initial ignition on, the Transmission Control Module (TCM) receives the calibrated data from the Engine/Powertrain Control Module (ECM/PCM) over the CAN Bus and stores this information in the EEPROM of the TCM. During normal operation the TCM compares the stored data in the EEPROM to the transmitted data from the ECM/PCM. If the calibration data does not match the DTC will set and the MIL will illuminate after two consecutive failures.
The Transmission Control Module receives vehicle information over the CAN Bus from the FCM/TIPM and stores this information in the EEPROM of the controller. This information is compared information received over the CAN Bus. If the information does not match, the DTC will set.
The Transmission Control Module (TCM) receives Engine rpm over the CAN Bus.
The Transmission Control Module request from the PCM to change the torque of the engine to avoid possible damage to the transmission.
See also:
• DTC INDEX