Theory of Operation
Battery voltage is supplied to the controller and is used to write to the controller EEPROM after vehicle shutdown.
The Transmission Control Module (TCM) performs several internal checks on the processor. The controller checks the Check Sum of the ROM, the Read/Write integrity of the RAM, and the Check Sum of the EEPROM.
The Transmission Control Output is used to supply the primary power to the Transmission Control Module (TCM). When the ignition switch is in the unlock, run or crank position, the ignition switch provides and input to the Totally Integrated Power Module (TIPM). The TIPM then energizes the Transmission Control relay which provides voltage to the TCM.
The Transmission Range Sensor (TRS) is a multiple position selector switch which changes the signal path by redirecting a 12-volt signal source to seven different TRS signal circuits (P, R, N, D, 3, 2, 1) and also houses a Park/Neutral (P/N) switch circuit. These circuits are monitored by the Transmission Control Module and used in conjunction with various pressure switches to validate proper operation of the transmission and diagnose any possible problem. In a normal operating mode, pressure switch 8, is in an " Open" ? state in P, R, or N. and in a "Closed" state in any forward gear (engine running).
The Transmission Range Sensor (TRS) is a multiple position selector switch which changes the signal path by redirecting a 12-volt signal source to seven different TRS signal circuits (P, R, N, D, 3, 2, 1) and also houses a Park/Neutral (P/N) switch circuit. These circuits are monitored by the Transmission Control Module and used in conjunction with various pressure switches to validate proper operation of the transmission and diagnose any possible problem. In a normal operating mode, pressure switch 8, is in an "Open" state in P, R, or N. and in an "Closed" state in any forward gear (engine running).
The Transmission Range Sensor (TRS) is a multiple position selector switch which changes the signal path by redirecting a 12-volt signal source to seven different TRS signal circuits (P, R, N, D, 3, 2, 1) and also houses a Park/Neutral (P/N) switch circuit. These circuits are monitored by the Transmission Control Module and used in conjunction with various pressure switches to validate proper operation of the transmission and diagnose any possible problem. In a normal operating mode, pressure switch 8, is in an "Open" state in P, R, or N. and in an "Closed" state in any forward gear (engine running).
The Transmission Oil Temperature Sensor is used to determine shift schedule selection. Transmission Oil Temperature is also used in TCC operation. The Transmission Control Module (TCM) monitors the transmission temperature by comparing Transmission Oil Temperature to Ambient and Engine Coolant Temperature after a cold soak, by comparing Transmission Oil temperature increases in relation to Engine temperature increases, and abnormal changes over time.
The Transmission Oil Temperature Sensor is used to determine shift schedule selection. Transmission Oil Temperature is also used in TCC operation.
The Transmission Oil Temperature Sensor is used to determine shift schedule selection. Transmission Oil Temperature is also used in TCC operation.
The Input Speed sensor is used to calculate torque converter speed ratio. The Input Speed sensor is also used together with Output Speed sensor to calculate gear ratios.
The Output Speed sensor is used to determine gear position by applying the signal to a static shift schedule map. The Output Speed sensor is also used together with Input Speed sensor to calculate gear ratios. The Transmission Control Module (TCM) compares Output shaft speed to Vehicle speed buss messages to diagnosis the system. If the TCM detects a fault with the Output speed signal, it switches to vehicle speed to determine gear position.
The Transmission Control Module (TCM) constantly calculates what the output shaft speed should be in any given gear based on the input speed sensor, output speed sensor and the current gear state.
The Linear Solenoid 4 is used to control overall transmission line pressure. The Transmission Control Module (TCM) monitors the Solenoid current load and resistance. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, and the MIL will be illuminated.
The Linear Solenoid 1 is used to control input pressure to the Control Valve 1. The Control Valve 1 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The Transmission Control Module (TCM) verifies the operation of the Control Valve 1 by monitoring the Pressure Switch 1. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Linear Solenoid 1 is used to control input pressure to the Control Valve 1. The Control Valve 1 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The Transmission Control Module (TCM) monitors the Solenoid current load and resistance. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Transmission Control Module (TCM) verifies the operation of the Shift (On/Off) Valve 1 by monitoring the Pressure Switch 3. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Transmission Control Module (TCM) verifies the operation of the Shift (On/Off) Valve 2 by monitoring the Pressure Switch 4. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Transmission Control Module (TCM) verifies the operation of the Shift (On/Off) Valve 3 by monitoring the Pressure Switch 5. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Transmission Control Module (TCM) verifies the operation of the Shift (On/Off) Valve 4 by monitoring the Pressure Switch 6. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Linear Solenoid 2 is used to control input pressure to the Control Valve 2. The Control Valve 2 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The Transmission Control Module (TCM) verifies the operation of the Control Valve 2 by monitoring the Pressure Switch 2. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Linear Solenoid 2 is used to control input pressure to the Control Valve 2. The Control Valve 2 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The TCM monitors the Solenoid current load and resistance. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Linear Solenoid 3 is used to control input pressure to the Control Valve 3. The Control Valve 3 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The TCM verifies the operation of the Control Valve 3 by monitoring the Pressure Switch 7. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Linear Solenoid 3 is used to control input pressure to the Control Valve 3. The Control Valve 3 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The Transmission Control Module (TCM) monitors the Solenoid current load and resistance. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.
The Shift (On/Off) Solenoid 1 is used to switch hydraulic paths on the Shift Valve 1 which will direct a gear shift.
The Shift (On/Off) Solenoid 1 is used to switch hydraulic paths on the Shift Valve 1 which will direct a gear shift.
The Shift (On/Off) Solenoid 2 is used to switch hydraulic paths on the Shift Valve 2 which will direct a gear shift.
The Shift (On/Off) Solenoid 2 is used to switch hydraulic paths on the Shift Valve 2 which will direct a gear shift.
The Shift (On/Off) Solenoid 3 is used to switch hydraulic paths on the Shift Valve 3 which will direct a gear shift.
The Shift (On/Off) Solenoid 3 is used to switch hydraulic paths on the Shift Valve 3 which will direct a gear shift.
The Shift (On/Off) Solenoid 4 is used to switch hydraulic paths on the Control Valves 1 and 2.
The Shift (On/Off) Solenoid 4 is used to switch hydraulic paths on the Control Valves 1 and 2.
The Transmission Control Module (TCM) needs to learn certain values to properly control Transmission operation. This DTC indicates that these values are not currently learned in the TCM. If the TCM or Transmission is replaced, the Quick Learn Procedure must be performed.
The Output Speed sensor is used to determine gear position by applying the signal to a static shift schedule map. The Output Speed sensor is also used together with Input Speed sensor to calculate gear ratios. The Transmission Control Module (TCM) compares Output shaft speed to Vehicle speed buss messages to diagnosis the system. If the TCM detects a fault with the Output speed signal, it switches to vehicle speed to determine gear position.
The Transmission Oil Temperature Sensor is used to determine shift schedule selection. Transmission Oil Temperature is also used in TCC operation. The Transmission Control Module (TCM) monitors the transmission temperature by comparing Transmission Oil Temperature to Ambient and Engine Coolant Temperature after a cold soak, by comparing Transmission Oil temperature increases in relation to Engine temperature increases, and abnormal changes over time.
The Torque Converter Out Oil Temperature sensor is used to determine if the transmission needs to go into high temperature shift strategy to protect the transmission.
The Torque Converter Out Oil Temperature sensor is used to determine if the transmission needs to go into high temperature shift strategy to protect the transmission.
This Diagnostic Trouble Code (DTC) checks the mechanical operation of the Torque Converter Clutch (TCC). When the TCC is commanded on, there should be little or no difference between Engine speed and Input speed. If the TCM detects the TCC is slipping greater than a calibrated value, for two consecutive ignition cycles, this DTC will set.
The Transmission Range Sensor (TRS) is a multiple position selector switch which changes the signal path by redirecting a 12-volt signal source to seven different TRS signal circuits (P, R, N, D, 3, 2, 1) and also houses a Park/Neutral (P/N) switch circuit. These circuits are monitored by the Transmission Control Module (TCM) and used in conjunction with various pressure switches to validate proper operation of the transmission and diagnose any possible problem. In a normal operating mode, pressure switch 8, is in an "Open" state in P, R, or N. and in a "Closed" state in any forward gear (engine running). If the TCM detects all of shift lever positions registering "OPEN", the code will set and the PRNDL display will have all of the Shift Lever positions boxed. This DTC will not illuminate the MIL
The Transmission Control Module (TCM) continuously monitors the Bus activity and receives the messages it needs.
The Transmission Control Module (TCM) continuously monitors the Bus activity and receives the messages it needs. The CAN C Bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine Controller is unable to communicate with the Transmission Controller, the Engine Controller will light the MIL.
The Transmission Control Module (TCM) continuously monitors the Bus activity and receives the messages it needs.
The Transmission Control Module (TCM) continuously monitors the Bus activity and receives the messages it needs.
The Transmission Control Module (TCM) continuously monitors the Bus activity and receives the messages it needs.
The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.
The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.
This message is used by the TCM in the transmission temperature sensor and transmission fluid temperature sensor performance detections.
This message is used by the TCM as part of the torque management strategy between the PCM and the TCM.
This message is used by the TCM to switch to Coast-Down strategy just prior to vehicle coming to a halt.
The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.
This message is used by the TCM as part of the torque management strategy between the PCM and the TCM.
This message is used by the TCM in the transmission temperature sensor and transmission fluid temperature sensor performance detections.
This programmed axle ratio information is received from the TIPM to be used by the TCM as part of speed sensor diagnostics.
This programmed Transfer Case Hi Ratio information is received from the TIPM to be used by the TCM as part of speed sensor diagnostics.
This programmed Transfer Case Low Ratio information is received from the TIPM to be used by the TCM as part of speed sensor diagnostics.
This message is used by the Transmission Control Module (TCM) for Electronic Range Select (ERS) operation. The ERS switch is hard wired to the Cabin Compartment Node (CCN). The CCN then sends a CAN bus message to the TCM.