THEORY OF OPERATION
The purpose of this diagnostic is to check the integrity of the calibration data in the TCM. This is accomplished by calculating the checksum of all the calibration data after the TCM is powered up. The malfunction condition is detected if the calculated checksum of the calibration data is not equal to the stored checksum located in the Non-Volatile Random Access Memory (NVRAM).
The purpose of this diagnostic is to check the electrical and rationality performance of the transmission range sensor (TRS) circuit. The range sensor circuit is connected to the TCM by four independent circuits which distinguish between the possible shifter positions (park, reverse, neutral, and drive). The shifter position is determined based upon a 4-bit pattern (S1, S2, S3, and S4) which is described below. Two distinct fault conditions are detected by this diagnostic.
The purpose of this diagnostic is to check the electrical and rationality performance of the transmission range sensor (TRS) circuit. The range sensor circuit is connected to the TCM by four independent circuits which distinguish between the possible shifter positions (park, reverse, neutral, and drive). The shifter position is determined based upon a 4-bit pattern (S1, S2, S3, and S4) which is described below. Two distinct fault conditions are detected by this diagnostic.
The purpose of this diagnostic is to check the rationality of the transmission fluid temperature (TFT) sensor signal. The TFT sensor is an analog device for which the TCM performs A/D conversion every 80 msec. The TFT sensor circuit diagram is (Схема №4) The malfunction conditions detected in range by this diagnostic include TFT sensor signal stuck too low, stuck low and stuck high.
The purpose of this diagnostic is to check the electrical performance of the transmission fluid temperature (TFT) sensor circuit. The TFT sensor is an analog device for which the TCM performs A/D conversion every 80 msec. The malfunction conditions detected by this diagnostic include shorted to battery, short to ground, and open circuit failures. If the TFT sensor circuit is out of range high (shorted to battery or open circuit) or out of range low (shorted to ground), a fault is detected.
The purpose of this diagnostic is to check the electrical performance of the transmission fluid temperature (TFT) sensor circuit. The TFT sensor is an analog device for which the TCM performs A/D conversion every 80 msec. The malfunction conditions detected by this diagnostic include shorted to battery, short to ground, and open circuit failures. If the TFT sensor circuit is out of range high (shorted to battery or open circuit) or out of range low (shorted to ground), a fault is detected.
The purpose of this diagnostic is to check the electrical performance of the input speed sensor circuit. The sensor is located in front of the target wheel which is connected to the transmission input shaft, and measures the rotation of the target wheel. The input speed sensor is a Hall Effect sensor with a pulse train output frequency range of 50 ~ 8000 rpm. The normal operating output voltage range of the input speed sensor is in the range of 0.8 to 1.5 V. The malfunction conditions detected by this diagnostic include short to battery, short to ground, and open circuit failures. These malfunctions are determined based upon the A/D conversion value.
The purpose of this diagnostic is to check the rationality of the transmission input speed sensor signal. The transmission input speed should be synchronized with the transmission output speed. The malfunction condition is detected if the measured input speed sensor signal is stuck below a low speed threshold or present above an out of range high speed threshold.
This is where you put the Theory of Operation.
This is where you put the Theory of Operation.
The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.
The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.
The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.
The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.
The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.
The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.
The purpose of this diagnostic is to check the mechanical performance of the torque converter clutch (TCC). The TCC is a mechanical torque transfer device controlled by transmission fluid pressure to increase fuel economy through reducing frictional losses of the torque converter. The malfunction condition is detected if the torque converter clutch is stuck off. This failure may be caused by conditions including transmission fluid contamination or TCC mechanical failure.
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3 rd , 5 th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3 rd , 5 th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
This is where you put the Theory of Operation.
This is where you put the Theory of Operation.
The purpose of this diagnostic is to check the electrical performance of the input speed sensor circuit. The sensor is located in front of the target wheel which is connected to the transmission input shaft, and measures the rotation of the target wheel. The input speed sensor is a Hall Effect sensor with a pulse train output frequency range of 50 ~ 8000 rpm. The normal operating output voltage range of the input speed sensor is in the range of 0.8 to 1.5 V. The malfunction conditions detected by this diagnostic include short to battery, short to ground, and open circuit failures. These malfunctions are determined based upon the A/D conversion value.
The purpose of this diagnostic is to check the electrical performance of the input speed sensor circuit. The sensor is located in front of the target wheel which is connected to the transmission input shaft, and measures the rotation of the target wheel. The input speed sensor is a Hall Effect sensor with a pulse train output frequency range of 50 ~ 8000 rpm. The normal operating output voltage range of the input speed sensor is in the range of 0.8 to 1.5 V. The malfunction conditions detected by this diagnostic include short to battery, short to ground, and open circuit failures. These malfunctions are determined based upon the A/D conversion value.
The purpose of this diagnostic procedure is to check the electrical performance of the power source which supplies the solenoid power circuit. The malfunction conditions detected by this diagnostic include out of range high and out of range low failures. The TCM measures the power source using a common input internal to the controller.
There are two solenoid power circuits (High Side Driver 1 and High Side Driver 2) within the TCM supplying battery voltage to two banks of four solenoids each. The diagnostic checks that the voltage supplied to these two solenoid power circuits is in the normal operating range.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the functionality of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3rd, 5th, Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2nd, 6th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The malfunction condition is detected if the measured solenoid feedback current does not correlate to the TCM commanded solenoid current. This failure may be caused by conditions such as internal circuit corrosion or manufacturing defects.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3 rd , 5 th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3 rd , 5 th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3 rd , 5 th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3 rd , 5 th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the functionality of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3rd, 5th, Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2nd, 6th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The malfunction condition is detected if the measured solenoid feedback current does not correlate to the TCM commanded solenoid current. This failure may be caused by conditions such as internal circuit corrosion or manufacturing defects.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the functionality of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3rd, 5th, Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2nd, 6th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The malfunction condition is detected if the measured solenoid feedback current does not correlate to the TCM commanded solenoid current. This failure may be caused by conditions such as internal circuit corrosion or manufacturing defects.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the functionality of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3rd, 5th, Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2nd, 6th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The malfunction condition is detected if the measured solenoid feedback current does not correlate to the TCM commanded solenoid current. This failure may be caused by conditions such as internal circuit corrosion or manufacturing defects.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the functionality of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3rd, 5th, Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2nd, 6th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The malfunction condition is detected if the measured solenoid feedback current does not correlate to the TCM commanded solenoid current. This failure may be caused by conditions such as internal circuit corrosion or manufacturing defects.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the functionality of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3rd, 5th, Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2nd, 6th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The malfunction condition is detected if the measured solenoid feedback current does not correlate to the TCM commanded solenoid current. This failure may be caused by conditions such as internal circuit corrosion or manufacturing defects.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
The purpose of this diagnostic is to check the electrical performance of each of the six variable force solenoid circuits. The six variable force solenoids include a shift solenoid C which controls the 3 rd , 5 th , Reverse clutch, shift solenoid D which controls the Over Drive clutch, shift solenoid E which controls the Under Drive brake, shift solenoid F which controls the 2 nd , 6 th brake, pressure control solenoid A which controls the hydraulic line pressure, and torque converter clutch pressure control solenoid which controls the torque converter lock up clutch. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
This diagnostic checks the validity of the two CAN messages sent by the Powertrain Controller Module (PCM) containing information about the engine torque. The diagnostic checks the validity by performing a CRC and message counter check to be sure the CAN messages are continuously updated by the PCM and they contain valid values.
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.
See also:
• DTC INDEX
• STANDARD PROCEDURE