SYSTEM DESCRIPTION
The TCM uses the vehicle speed signal and signals from the transmission speed sensors (NC, NT) to detect the actual gear (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 mechanical problems of the shift solenoid valves and valve body.
| 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.) |
MONITOR DESCRIPTION
The TCM commands gear shifts by turning the shift solenoid valves on and off. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (speed), the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and stores the DTC.
The TCM uses the vehicle speed signal and signals from the transmission speed sensors (NC, NT) to detect the actual gear (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 mechanical problems of the shift solenoid valves and valve body.
| 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 and off. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (speed), the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and stores the DTC.
DESCRIPTION
Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. 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. Refer to FAIL-SAFE CHART .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0798 | The TCM checks for an open or short in the shift solenoid valve SL3 circuit while driving and shifting gears. (1-trip detection logic) Output signal duty equals to 100%. (NOTE: SL3 output signal duty is less than 100% under normal condition.) | 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 .
Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. 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. Refer to FAIL-SAFE CHART .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0798 | The TCM checks for an open or short in the shift solenoid valve SL3 circuit while driving and shifting gears. (1-trip detection logic) Output signal duty equals to 100%. (NOTE: SL3 output signal duty is less than 100% under normal condition.) | 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. 1 is installed in the shift solenoid valve ATF output passage. This switch is used to identify the malfunctioning part when a fail-safe operation is performed. If the shift solenoid valve malfunctions when the ATF pressure switch has a malfunction, a fail-safe operation will be performed. This fail-safe operation is different from the fail-safe operation performed when the solenoid valve malfunctions and the ATF pressure switch is normal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0872 | ATF pressure switch No. 1 OFF is detected twice when any of the gears from 1st to 4th engages normally. (2-trip detection logic) | ATF temperature sensor assembly (ATF pressure switch No. 1) Transmission wire TCM |
| P0873 | ATF pressure switch No. 1 ON is detected twice when 5th or 6th gear engages normally. (2-trip detection logic) |
Scheme 734
ATF pressure switch No. 1 is installed in the shift solenoid valve ATF output passage. This switch is used to identify the malfunctioning part when a fail-safe operation is performed. If the shift solenoid valve malfunctions when the ATF pressure switch has a malfunction, a fail-safe operation will be performed. This fail-safe operation is different from the fail-safe operation performed when the solenoid valve malfunctions and the ATF pressure switch is normal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0872 | ATF pressure switch No. 1 OFF is detected twice when any of the gears from 1st to 4th engages normally. (2-trip detection logic) | ATF temperature sensor assembly (ATF pressure switch No. 1) Transmission wire TCM |
| P0873 | ATF pressure switch No. 1 ON is detected twice when 5th or 6th gear engages normally. (2-trip detection logic) |
ATF pressure switch No. 2 is installed in the shift solenoid valve ATF output passage. This switch is used to identify the malfunctioning part when a fail-safe operation is performed. If the shift solenoid valve malfunctions when the ATF pressure switch has a malfunction, a fail-safe operation will be performed. This fail-safe operation is different from the fail-safe operation performed when the solenoid valve malfunctions and the ATF pressure switch is normal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0877 | ATF pressure switch No. 2 OFF is detected twice when any of the gears from 4th to 6th engages normally. (2-trip detection logic) | ATF temperature sensor assembly (ATF pressure switch No. 2) Transmission wire TCM |
| P0878 | ATF pressure switch No. 2 ON is detected twice when any of the gears from 1st to 3rd engages normally. (2-trip detection logic) |
Scheme 735
ATF pressure switch No. 2 is installed in the shift solenoid valve ATF output passage. This switch is used to identify the malfunctioning part when a fail-safe operation is performed. If the shift solenoid valve malfunctions when the ATF pressure switch has a malfunction, a fail-safe operation will be performed. This fail-safe operation is different from the fail-safe operation performed when the solenoid valve malfunctions and the ATF pressure switch is normal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0877 | ATF pressure switch No. 2 OFF is detected twice when any of the gears from 4th to 6th engages normally. (2-trip detection logic) | ATF temperature sensor assembly (ATF pressure switch No. 2) Transmission wire TCM |
| P0878 | ATF pressure switch No. 2 ON is detected twice when any of the gears from 1st to 3rd engages normally. (2-trip detection logic) |
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.
*: Duty Ratio
The duty ratio is the ratio of the electrical current on time (A) to the total of the electrical current on and off time (A + B).
Duty Ratio (%) = (A / (A + B)) x 100
Scheme 736
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2714 | The ECM 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 Automatic transaxle (clutch, brake or gear, etc.) |
The TCM calculates the amount of clutch slip based on the turbine speed, output shaft speed, and gear ratio. If the amount of clutch slip exceeds a specified level, the TCM will set this DTC and illuminate the MIL.
When shift solenoid valve SLT remains on, the line pressure goes down and clutch engagement force decreases.
Note. If driving continues under these conditions, 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.
*: Duty Ratio
The duty ratio is the ratio of the electrical current on time (A) to the total of the electrical current on and off time (A + B).
Duty Ratio (%) = (A / (A + B)) x 100
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2714 | The ECM 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 Automatic transaxle (clutch, brake or gear, etc.) |
The TCM calculates the amount of clutch slip based on the turbine speed, output shaft speed, and gear ratio. If the amount of clutch slip exceeds a specified level, the TCM will set this DTC and illuminate the MIL.
When shift solenoid valve SLT remains on, the line pressure goes down and clutch engagement force decreases.
Note. If driving continues under these conditions, 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 737
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 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 shift solenoid SLU. When 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 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 (speed) 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 (speed) 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 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 shift solenoid SLU. When 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 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 (speed) 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 (speed) 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 738
*: Duty Ratio
The duty ratio is the ratio of the electrical current on time (A) to the total of the electrical current on and off time (A + B).
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 electrical current on time (A) to the total of the electrical current on and off time (A + B).
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.
Shift solenoid valve SL is turned on and 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 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 shift solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter clutch engagement. 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.
Shift solenoid valve SL is turned on and 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 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 shift solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter clutch engagement. 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 and signals from the transmission speed sensors (NC, NT) to detect the actual gear (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 mechanical problems of the shift solenoid valves and valve body.
| 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 and off. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (speed), the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and stores the DTC.
The TCM uses the vehicle speed signal and signals from the transmission speed sensors (NC, NT) to detect the actual gear (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 mechanical problems of the shift solenoid valves and valve body.
| 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 and off. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (speed), the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and stores the DTC.
Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. 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. Refer to FAIL-SAFE CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2810 | The TCM checks for an open or short in the shift solenoid valve SL4 circuit while driving and shifting gears. (1-trip detection logic) Output signal duty equals to 100%. (NOTE: SL4 output signal duty is less than 100% under normal condition.) | 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 .
Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. 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. Refer to FAIL-SAFE CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2810 | The TCM checks for an open or short in the shift solenoid valve SL4 circuit while driving and shifting gears. (1-trip detection logic) Output signal duty equals to 100%. (NOTE: SL4 output signal duty is less than 100% under normal condition.) | 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 communicates with the TCM using the Controller Area Network (CAN).
If there is a problem in this communication, 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): Engine switch on (IG) Battery voltage is 10.5 V or more No communication between the engine control ECU and TCM | Harness and connector ECM TCM |
The engine control unit communicates with the TCM using the Controller Area Network (CAN).
If there is a problem in this communication, 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): Engine switch on (IG) Battery voltage is 10.5 V or more No communication between the engine control ECU and TCM | Harness and connector ECM TCM |
When the shift lever is in S and it is moved toward "-" or "+", it is possible to select different shift ranges (1st through 6th ranges).
Moving the shift lever toward "+" increases the shift range by one, and moving the shift lever toward "-" decreases the shift range by one.
Scheme 739
Scheme 740
Scheme 741
- CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH) Disconnect the transmission control switch connector of shift lock control unit assembly. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F30-6 (IG) - Body ground or other terminals Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Transmission Control Switch) 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 F30-11 (E) - Body ground or other terminals Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Transmission Control Switch) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- INSPECT SHIFT LOCK CONTROL UNIT ASSEMBLY (TRANSMISSION CONTROL SWITCH) Measure the resistance between each terminal of the transmission control switch when the shift lever is moved to each position. Standard Resistance Tester Connection Condition Specified Condition 6 (IG) - 13 (S) Shift lever in S, "+" or "-" Below 1 ohms Shift lever not in S, "+" or "-" 10 kohms or higher 5 (SFTU) - 11 (E) Shift lever held in "+" (Up-shift) Below 1 ohms Shift lever not held in "+" 10 kohms or higher 4 (SFTD) - 11 (E) Shift lever held in "-" (Down-shift) Below 1 ohms Shift lever not held in "-" 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Transmission Control Switch) NG --> See step 6 OK: Go to next step
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) Connect the transmission control switch connector. Disconnect the ECM connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A43-25 (S) - Body ground or other terminals Engine switch on (IG) Shift lever in S, "+" or "-" 11 to 14 V A43-25 (S) - Body ground or other terminals Engine switch on (IG) Shift lever not in S, "+" or "-" Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Turn the engine switch off. Disconnect the spiral cable connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A43-38 (SFTU) - Body ground or other terminals Shift lever held in "+" (Up-shift) Below 1 ohms Shift lever not held in "+" 10 kohms or higher A43-27 (SFTD) - Body ground or other terminals Shift lever held in "-" (Down-shift) Below 1 ohms Shift lever not held in "-" 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400823-S27359834412011051800000)
- REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY (TRANSMISSION CONTROL SWITCH). Refer to «REMOVAL»(ref-400804-S23319245912011051800000)
When the shift lever is in S and it is moved toward "-" or "+", it is possible to select different shift ranges (1st through 6th ranges).
Moving the shift lever toward "+" increases the shift range by one, and moving the shift lever toward "-" decreases the shift range by one.
When the engine switch is turned to on (IG), voltage from the ECM's MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.
Scheme 742
Scheme 743
Scheme 744
Scheme 745
- CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) Turn the engine switch off. Disconnect the TCM connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D2-8 (E1) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to TCM) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL) Disconnect the TCM connectors. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D2-18 (+B) - Body ground Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to TCM) NG --> See step 3 OK --> See step 4
- CHECK HARNESS AND CONNECTOR (TCM - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Turn the engine switch off. Disconnect the TCM connector. Remove the EFI MAIN relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D2-18 (+B) - 3 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D2-18 (+B) or 3 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to TCM) *2 Engine Room Relay Block *3 EFI MAIN Relay NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400823-S27359834412011051800000)
- GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM). Refer to «ECM Power Source Circuit»(ref-400785-S30420739032011051800000)
When the engine switch is turned to on (IG), voltage from the ECM's MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.