DESCRIPTION
This sensor detects the rotation speed of the turbine which shows the input speed of transaxle. By comparing the input turbine speed signal (NC) with the counter gear speed sensor signal (NC), the TCM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions, thus, providing smooth gear shift.
Scheme 368
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0791 | When the speed sensor input voltage is either more than 1.9 V or less than 0.1 V for 2 seconds or more. (1-trip detection logic) | Transmission revolution sensor (speed sensor NC) Transmission wire TCM |
| P0793 | When the vehicle speed is 25 km/h (15.5 mph) or higher, the counter gear speed is less than 300 RPM for 2 seconds or more. (1-trip detection logic) |
MONITOR DESCRIPTION
The NT terminal of the TCM detects a revolution signal from the speed sensor (NT) (input RPM). The TCM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd, 4th or 5th gear in the shift position of D, if the input shaft revolution is less than 300 RPM *1 although the output shaft revolution is more than 1,000 RPM *2 , the TCM interprets this as a fault, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 31 mph (50 km/h) or more.
This sensor detects the rotation speed of the turbine which shows the input speed of transaxle. By comparing the input turbine speed signal (NC) with the counter gear speed sensor signal (NC), the TCM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions, thus, providing smooth gear shift.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0791 | When the speed sensor input voltage is either more than 1.9 V or less than 0.1 V for 2 seconds or more. (1-trip detection logic) | Transmission revolution sensor (speed sensor NC) Transmission wire TCM |
| P0793 | When the vehicle speed is 25 km/h (15.5 mph) or higher, the counter gear speed is less than 300 RPM for 2 seconds or more. (1-trip detection logic) |
The NT terminal of the TCM detects a revolution signal from the speed sensor (NT) (input RPM). The TCM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd, 4th or 5th gear in the shift position of D, if the input shaft revolution is less than 300 RPM *1 although the output shaft revolution is more than 1,000 RPM *2 , the TCM interprets this as a fault, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 31 mph (50 km/h) or more.
SYSTEM DESCRIPTION
The TCM uses the vehicle speed signal to determine the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect shift solenoid valves and valve body mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0796 | The engine revs freely when 2nd or 6th gear is commanded (2-trip detection logic). When the following is detected twice (2-trip detection logic): When 1st gear is commanded, 2nd gear is engaged. | Shift solenoid valve SL3 remains open or closed. Valve body is blocked. Automatic transaxle (clutch, brake or gear etc.) |
The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL and stores the DTC.
The TCM uses the vehicle speed signal to determine the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect shift solenoid valves and valve body mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0796 | The engine revs freely when 2nd or 6th gear is commanded (2-trip detection logic). When the following is detected twice (2-trip detection logic): When 1st gear is commanded, 2nd gear is engaged. | Shift solenoid valve SL3 remains open or closed. Valve body is blocked. Automatic transaxle (clutch, brake or gear etc.) |
The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL and stores the DTC.
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, SL4 and SL which is controlled by the TCM. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. Refer to FAIL-SAFE CHART .
| DTC No. | DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other | Trouble Area |
|---|---|---|
| P0798 | Driving so that gear changes occur Solenoid valve SL3 circuit is open or shorted 1 second 1 trip detection logic | Open or short in shift solenoid valve SL3 circuit Shift solenoid valve SL3 TCM |
The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. And the TCM performs the fail-safe function and turns the other normal shift solenoid valves on or off (In case of an open or short circuit, the TCM stops sending current to the circuit.)
Refer to FAIL-SAFE CHART .
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, SL4 and SL which is controlled by the TCM. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. Refer to FAIL-SAFE CHART .
| DTC No. | DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other | Trouble Area |
|---|---|---|
| P0798 | Driving so that gear changes occur Solenoid valve SL3 circuit is open or shorted 1 second 1 trip detection logic | Open or short in shift solenoid valve SL3 circuit Shift solenoid valve SL3 TCM |
The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. And the TCM performs the fail-safe function and turns the other normal shift solenoid valves on or off (In case of an open or short circuit, the TCM stops sending current to the circuit.)
Refer to FAIL-SAFE CHART .
ATF pressure switch No. 3 is installed in the lock-up solenoid ATF output passage and is used to detect a malfunction in the lock-up solenoid.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0989 | Transmission fluid pressure switch No. 3 is OFF when lock-up occurs in response to a lock-up request (2-trip detection logic). | ATF temperature sensor assembly (ATF pressure switch No. 3) Transmission wire TCM |
| P0990 | When both of the following are detected (2-trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up does not occur when shift solenoid valve (SLU) is requested to turn off in the lock-up range. |
The TCM illuminates the MIL and stores the DTC when the TCM detects that the ATF pressure switch is OFF with the lock-up solenoid ON or when the TCM detects that the ATF pressure switch is ON with the lock-up solenoid OFF.
ATF pressure switch No. 3 is installed in the lock-up solenoid ATF output passage and is used to detect a malfunction in the lock-up solenoid.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0989 | Transmission fluid pressure switch No. 3 is OFF when lock-up occurs in response to a lock-up request (2-trip detection logic). | ATF temperature sensor assembly (ATF pressure switch No. 3) Transmission wire TCM |
| P0990 | When both of the following are detected (2-trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up does not occur when shift solenoid valve (SLU) is requested to turn off in the lock-up range. |
The TCM illuminates the MIL and stores the DTC when the TCM detects that the ATF pressure switch is OFF with the lock-up solenoid ON or when the TCM detects that the ATF pressure switch is ON with the lock-up solenoid OFF.
The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The TCM adjusts the duty ratio of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2714 | The TCM detects a malfunction in the shift solenoid valve SLT (ON side) according to the difference in the speed between the turbine and the output shaft, and also by the transmission fluid pressure. (2-trip detection logic) | Shift solenoid valve SLT remains open Shift solenoid valve SL1, SL2, SL3 or SL4 remains open or closed Valve body is blocked Torque converter clutch Automatic transaxle (clutch, brake or gear, etc.) |
The TCM calculates the amount of heat absorbed by the friction material based on the difference in revolution (clutch slippage) between the turbine and output shaft. The TCM turns on the MIL and outputs this DTC when the amount of heat absorption exceeds the specified value.
When the shift solenoid valve SLT remains on, oil pressure goes down and clutch engagement force decreases.
Note. If driving continues under these conditions, the clutches will burn out and the vehicle will no longer be drivable.
The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The TCM adjusts the duty ratio of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2714 | The TCM detects a malfunction in the shift solenoid valve SLT (ON side) according to the difference in the speed between the turbine and the output shaft, and also by the transmission fluid pressure. (2-trip detection logic) | Shift solenoid valve SLT remains open Shift solenoid valve SL1, SL2, SL3 or SL4 remains open or closed Valve body is blocked Torque converter clutch Automatic transaxle (clutch, brake or gear, etc.) |
The TCM calculates the amount of heat absorbed by the friction material based on the difference in revolution (clutch slippage) between the turbine and output shaft. The TCM turns on the MIL and outputs this DTC when the amount of heat absorption exceeds the specified value.
When the shift solenoid valve SLT remains on, oil pressure goes down and clutch engagement force decreases.
Note. If driving continues under these conditions, the clutches will burn out and the vehicle will no longer be drivable.
Refer to DTC P2714. Refer to SYSTEM DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2716 | Open or short is detected in shift solenoid valve SLT circuit for 1 second or more while driving (1-trip detection logic). | Open or short in shift solenoid valve SLT circuit Shift solenoid valve SLT TCM |
When an open or short in the linear solenoid valve (SLT) circuit is detected, the TCM interprets this as a fault. The TCM will turn on the MIL and store the DTC.
Refer to DTC P2714. Refer to SYSTEM DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2716 | Open or short is detected in shift solenoid valve SLT circuit for 1 second or more while driving (1-trip detection logic). | Open or short in shift solenoid valve SLT circuit Shift solenoid valve SLT TCM |
When an open or short in the linear solenoid valve (SLT) circuit is detected, the TCM interprets this as a fault. The TCM will turn on the MIL and store the DTC.
The TCM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, output speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.
Scheme 369
The TCM compares the engagement condition of the lock-up clutch with the lock-up schedule in the TCM memory to detect shift solenoid valve SLU, valve body and torque converter clutch mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2757 | When both of the following are detected (2-trip detection logic): Lock-up does not occur when requested. Transmission fluid pressure switch No. 3 is OFF. When both of the following are detected (2-trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up occurs when the shift solenoid valve SLU is requested to turn on in the lock-up range. | Shift solenoid valve SLU remains open or closed Valve body is blocked Torque converter clutch Automatic transaxle (clutch, brake or gear, etc.) Line pressure is too low |
Torque converter lock-up is controlled by the TCM based on the turbine (input) speed sensor NT, output speed sensor NC, engine RPM, engine load, engine temperature, vehicle speed, transmission fluid temperature, and gear selection. The TCM determines the lock-up status of the torque converter by comparing the engine RPM (NE) to the input turbine RPM (NT). The TCM calculates the actual transmission gear by comparing input turbine RPM (NT) to output shaft RPM (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to the shift solenoid SLU. When the SLU is turned on, it applies pressure to the lock-up relay valve and locks the torque converter clutch.
If the TCM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the TCM interprets this as a fault in the shift solenoid valve SLU or lock-up system performance.
The TCM will turn on the MIL and store the DTC.
Example
When any of the following is met, the system judges it as a malfunction.
- There is a difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter when the TCM commands lock-up. (Engine speed is at least 70 RPM greater than input turbine speed.)
- There is no difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter when the TCM commands lock-up off. (The difference between engine speed and input turbine speed is less than 20 rpm.)
The TCM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, output speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.
The TCM compares the engagement condition of the lock-up clutch with the lock-up schedule in the TCM memory to detect shift solenoid valve SLU, valve body and torque converter clutch mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2757 | When both of the following are detected (2-trip detection logic): Lock-up does not occur when requested. Transmission fluid pressure switch No. 3 is OFF. When both of the following are detected (2-trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up occurs when the shift solenoid valve SLU is requested to turn on in the lock-up range. | Shift solenoid valve SLU remains open or closed Valve body is blocked Torque converter clutch Automatic transaxle (clutch, brake or gear, etc.) Line pressure is too low |
Torque converter lock-up is controlled by the TCM based on the turbine (input) speed sensor NT, output speed sensor NC, engine RPM, engine load, engine temperature, vehicle speed, transmission fluid temperature, and gear selection. The TCM determines the lock-up status of the torque converter by comparing the engine RPM (NE) to the input turbine RPM (NT). The TCM calculates the actual transmission gear by comparing input turbine RPM (NT) to output shaft RPM (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to the shift solenoid SLU. When the SLU is turned on, it applies pressure to the lock-up relay valve and locks the torque converter clutch.
If the TCM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the TCM interprets this as a fault in the shift solenoid valve SLU or lock-up system performance.
The TCM will turn on the MIL and store the DTC.
Example
When any of the following is met, the system judges it as a malfunction.
- There is a difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter when the TCM commands lock-up. (Engine speed is at least 70 RPM greater than input turbine speed.)
- There is no difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter when the TCM commands lock-up off. (The difference between engine speed and input turbine speed is less than 20 rpm.)
The amount of current flow to the solenoid is controlled by the (*) duty ratio of the TCM output signal. The higher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.
Scheme 370
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100 (%).
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2759 | Open or short is detected in shift solenoid valve SLU circuit for 1 second or more while driving (1-trip detection logic). | Open or short in shift solenoid valve SLU circuit Shift solenoid valve SLU TCM |
When an open or short in a shift solenoid valve (SLU) circuit is detected, the TCM determines there is a malfunction. The TCM will turn on the MIL and store this DTC.
The amount of current flow to the solenoid is controlled by the (*) duty ratio of the TCM output signal. The higher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100 (%).
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2759 | Open or short is detected in shift solenoid valve SLU circuit for 1 second or more while driving (1-trip detection logic). | Open or short in shift solenoid valve SLU circuit Shift solenoid valve SLU TCM |
When an open or short in a shift solenoid valve (SLU) circuit is detected, the TCM determines there is a malfunction. The TCM will turn on the MIL and store this DTC.
The shift solenoid valve SL is turned ON or OFF by signals from the TCM to control the hydraulic pressure acting on the lock-up relay valve, which then controls operation of the lock-up clutch.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2769 | TCM detects a short in the shift solenoid valve SL circuit when the shift solenoid valve SL is operated (2 trip detection logic). | Short in shift solenoid valve SL circuit Shift solenoid valve SL TCM |
| P2770 | TCM detects an open in the shift solenoid valve SL circuit when the shift solenoid valve SL is not operated (2 trip detection logic). | Open in shift solenoid valve SL circuit Shift solenoid valve SL TCM |
Fail-safe function
If the TCM detects a malfunction, it turns the shift solenoid valve SL OFF.
Based on the signals from the throttle position sensor, the air flow meter and the crankshaft position sensor, the TCM sends a signal to the solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter clutch engagement. The shift solenoid valve SL responds to commands from the TCM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the TCM detects an open or short circuit for shift solenoid valve SL, it will illuminate the MIL.
The shift solenoid valve SL is turned ON or OFF by signals from the TCM to control the hydraulic pressure acting on the lock-up relay valve, which then controls operation of the lock-up clutch.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2769 | TCM detects a short in the shift solenoid valve SL circuit when the shift solenoid valve SL is operated (2 trip detection logic). | Short in shift solenoid valve SL circuit Shift solenoid valve SL TCM |
| P2770 | TCM detects an open in the shift solenoid valve SL circuit when the shift solenoid valve SL is not operated (2 trip detection logic). | Open in shift solenoid valve SL circuit Shift solenoid valve SL TCM |
Fail-safe function
If the TCM detects a malfunction, it turns the shift solenoid valve SL OFF.
Based on the signals from the throttle position sensor, the air flow meter and the crankshaft position sensor, the TCM sends a signal to the solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter clutch engagement. The shift solenoid valve SL responds to commands from the TCM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the TCM detects an open or short circuit for shift solenoid valve SL, it will illuminate the MIL.
The TCM uses the vehicle speed signal to determine the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect shift solenoid valves and valve body mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2808 | The engine revs freely when 3rd or 5th gear is commanded. (2-trip detection logic) When any of the following is detected. In addition, the condition that 4th gear is engaged when 4th gear is commanded occurs twice. (2-trip detection logic) When 1st gear is commanded, 3rd gear is engaged. When 2nd gear is commanded, 3rd gear is engaged. When 6th gear is commanded, 5th gear is engaged. | Shift solenoid valve SL4 remains open or closed Valve body is blocked Automatic transaxle (clutch, brake or gear etc.) |
The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL and stores the DTC.
The TCM uses the vehicle speed signal to determine the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect shift solenoid valves and valve body mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2808 | The engine revs freely when 3rd or 5th gear is commanded. (2-trip detection logic) When any of the following is detected. In addition, the condition that 4th gear is engaged when 4th gear is commanded occurs twice. (2-trip detection logic) When 1st gear is commanded, 3rd gear is engaged. When 2nd gear is commanded, 3rd gear is engaged. When 6th gear is commanded, 5th gear is engaged. | Shift solenoid valve SL4 remains open or closed Valve body is blocked Automatic transaxle (clutch, brake or gear etc.) |
The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL and stores the DTC.
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, SL4 and SL which is controlled by the TCM. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. Refer to FAIL-SAFE CHART .
| DTC No. | DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other | Trouble Area |
|---|---|---|
| P2810 | Driving so that gear changes occur Solenoid valve SL4 circuit is open or shorted 1 second 1 trip detection logic | Open or short in shift solenoid valve SL4 circuit Shift solenoid valve SL4 TCM |
The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. And the TCM performs the fail-safe function and turns the other normal shift solenoid valves on or off (In case of an open or short circuit, the TCM stops sending current to the circuit.)
Refer to FAIL-SAFE CHART .
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, SL4 and SL which is controlled by the TCM. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. Refer to FAIL-SAFE CHART .
| DTC No. | DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other | Trouble Area |
|---|---|---|
| P2810 | Driving so that gear changes occur Solenoid valve SL4 circuit is open or shorted 1 second 1 trip detection logic | Open or short in shift solenoid valve SL4 circuit Shift solenoid valve SL4 TCM |
The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. And the TCM performs the fail-safe function and turns the other normal shift solenoid valves on or off (In case of an open or short circuit, the TCM stops sending current to the circuit.)
Refer to FAIL-SAFE CHART .
The engine control unit intercommunicates with the TCM with the Controller Area Network (CAN).
If there is a problem in this intercommunication, the TCM sets a DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Following conditions are met for 1.25 seconds (1 trip detection logic): Ignition switch ON (IG) Battery voltage is 10.5 V or more No intercommunication between the engine control ECU and TCM | TCM |
The engine control unit intercommunicates with the TCM with the Controller Area Network (CAN).
If there is a problem in this intercommunication, the TCM sets a DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Following conditions are met for 1.25 seconds (1 trip detection logic): Ignition switch ON (IG) Battery voltage is 10.5 V or more No intercommunication between the engine control ECU and TCM | TCM |
When moving the shift lever into the S position using the transmission control switch, it is possible to switch the shift range position between "1" (first range) and "6" (sixth range).
Shifting up "+" once raises one shift range position, and shifting down "-" lowers one shift range position.
Scheme 371
Scheme 372
Scheme 373
Scheme 374
Scheme 375
- CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH) Disconnect the transmission control switch connector of shift lever assembly. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition 3 - Body ground Ignition switch ON (IG) 11 to 14 V Ignition switch OFF Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 7 *1 - Body ground 5 *2 - Body ground Always Below 1 ohms *1: w/ Smart Key System *2: w/o Smart Key System NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- INSPECT TRANSMISSION CONTROL SWITCH Measure the resistance between each terminal of the shift lever assembly when the shift lever is moved to each position. Standard resistance Tester Connection Shift Position Specified Condition 3 - 9 *1 3 - 7 *2 S, "+" and "-" Below 1 ohms Except S, "+" and "-" 10 kohms or higher 2 - 7 *1 2 - 5 *2 Press continuously "+" (Up shift) Below 1 ohms S 10 kohms or higher 1 - 7 *1 1 - 5 *2 Press continuously "-" (Down shift) Below 1 ohms S 10 kohms or higher *1: w/ Smart Key System *2: w/o Smart Key System NG --> See step 5 OK: Go to next step
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) Connect the transmission control switch connector of the shift lever assembly. Disconnect the ECM connector. Turn the ignition switch on (IG), and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position. Standard voltage Tester Connection Shift Position Specified Condition A55-25 (S) - Body ground S, "+" and "-" 11 to 14 V Except S, "+" and "-" Below 1 V Turn the ignition switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position. Standard resistance Tester Connection Shift Position Specified Condition A55-16 (SFTU) - Body ground Press continuously "+" (Up shift) Below 1 ohms S 10 kohms or higher A55-51 (SFTD) - Body ground Press continuously "-" (Down shift) Below 1 ohms S 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-428882-S23679950822011101200000)
- REPLACE TRANSMISSION CONTROL SWITCH. Refer to «REMOVAL»(ref-428872-S23407536762011101200000)
When moving the shift lever into the S position using the transmission control switch, it is possible to switch the shift range position between "1" (first range) and "6" (sixth range).
Shifting up "+" once raises one shift range position, and shifting down "-" lowers one shift range position.
The park/neutral position switch detects the shift lever position and sends signals to the TCM.
Scheme 376
The park/neutral position switch detects the shift lever position and sends signals to the TCM.
When the ignition switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the EFI relay. This causes the contacts of the EFI relay to close, which supplies power to terminal +B of the TCM.
Scheme 377
Scheme 378
- INSPECT TCM TERMINAL VOLTAGE (+B TERMINAL) Disconnect the TCM connector. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition B53-18 (+B) - B53-8 (E1) Ignition Switch on (IG) 9 to 14 V Result Result Proceed to NG A OK B B --> CHECK FOR INTERMITTENT PROBLEMS A: Go to next step
- CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition B53-8 (E1) - Body ground Always Below 1 ohms Reconnect the TCM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - BODY GROUND) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - EFI RELAY)