DESCRIPTION
The speed sensors detect the wheel speed and send the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the TCM via the combination meter. The TCM determines the vehicle speed based on the frequency of these pulse signals.
Scheme 1195
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0500 | When the ECT sensor is normal and the counter gear speed is 300 rpm or more, the vehicle speed signal is not input for 2 seconds or more. | Open or short in vehicle speed signal circuit Combination meter Vehicle speed sensor (Brake control system) Skid control ECU (Brake control system) TCM |
MONITOR DESCRIPTION
The TCM assumes that the vehicle is being driven when the transmission counter gear indicates more than 300 rpm and over 30 seconds have passed since the park/neutral position switch was turned off. If there is no vehicle speed signal with these conditions satisfied, the TCM concludes that there is a vehicle speed signal malfunction. The TCM will turn on the MIL and a DTC will be set.
The speed sensors detect the wheel speed and send the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the TCM via the combination meter. The TCM determines the vehicle speed based on the frequency of these pulse signals.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0500 | When the ECT sensor is normal and the counter gear speed is 300 rpm or more, the vehicle speed signal is not input for 2 seconds or more. | Open or short in vehicle speed signal circuit Combination meter Vehicle speed sensor (Brake control system) Skid control ECU (Brake control system) TCM |
The TCM assumes that the vehicle is being driven when the transmission counter gear indicates more than 300 rpm and over 30 seconds have passed since the park/neutral position switch was turned off. If there is no vehicle speed signal with these conditions satisfied, the TCM concludes that there is a vehicle speed signal malfunction. The TCM will turn on the MIL and a DTC will be set.
The battery supplies electricity to the TCM even when the engine switch is off. This power allows the TCM to store data such as DTC history and freeze frame data. If the battery voltage falls below a minimum level, these memories are cleared and the TCM determines that there is a malfunction in the power supply circuit. When the engine is next started, the TCM will illuminate the MIL and set the DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0560 | Open in TCM back-up power source circuit. DTC is detected for 3 sec. or more (1 trip detection logic). | Open in back-up power source circuit SFI system TCM |
HINT
If DTC P0560 is set, the TCM does not store other DTCs.
While the engine is being cranked, battery voltage is applied to terminal STA of the TCM.
If the TCM detects the Starter Control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The TCM then illuminates the MIL and sets the DTC.
This monitor runs when the vehicle is driven at 20 km/h (12.4 mph) for over 20 seconds.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0617 | When conditions (a), (b) and (c) are met, positive (+B) battery voltage 10.5 V or more applied to TCM for 20 seconds (1 trip detection logic): (a) Vehicle speed more than 20 km/h (12.4 mph) (b) Engine speed more than 1000 rpm (c) STA signal ON | Park/Neutral Position switch Starter relay circuit Cranking holding function circuit TCM |
While the engine is being cranked, battery voltage is applied to terminal STA of the TCM.
If the TCM detects the Starter Control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The TCM then illuminates the MIL and sets the DTC.
This monitor runs when the vehicle is driven at 20 km/h (12.4 mph) for over 20 seconds.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0617 | When conditions (a), (b) and (c) are met, positive (+B) battery voltage 10.5 V or more applied to TCM for 20 seconds (1 trip detection logic): (a) Vehicle speed more than 20 km/h (12.4 mph) (b) Engine speed more than 1000 rpm (c) STA signal ON | Park/Neutral Position switch Starter relay circuit Cranking holding function circuit TCM |
The TCM monitors its internal operation and it will set this DTC when it detects an internal malfunction.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P062F | TCM internal error (EEPROM) | TCM |
The TCM monitors its internal operation. If the internal operation is malfunctioning, the TCM illuminates the MIL and sets a DTC.
The TCM monitors its internal operation and it will set this DTC when it detects an internal malfunction.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P062F | TCM internal error (EEPROM) | TCM |
The TCM monitors its internal operation. If the internal operation is malfunctioning, the TCM illuminates the MIL and sets a DTC.
The park/neutral position switch detects the shift lever position and sends signals to the TCM.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0705 | (A) Any 2 or more signals of the following are ON simultaneously (2-trip detection logic) NSW input signal is ON. R input signal is ON. D input signal is ON. (B) All switches are OFF simultaneously for NSW, R and D. | Open or short in park/neutral position switch circuit Park/neutral position switch TCM |
These DTCs indicate a problem with the park/neutral position switch and the wire harness in the park/neutral position switch circuit.
The park/neutral position switch detects the shift lever position and sends signals to the TCM.
For safety, the park/neutral position switch detects the shift lever position so that the engine can be started only when the shift lever is in P or N.
The park/neutral position switch sends a signal to the TCM according to the shift lever position (R or D). The TCM determines that there is a problem with the switch or related parts if it receives more than 1 position signal simultaneously. The TCM will turn on the MIL and store the DTC.
The Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value for use by the TCM.
Scheme 1196
The TCM applies a voltage to the temperature sensor through terminal OIL of the TCM.
The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.
The TCM calculates the fluid temperature based on the voltage signal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0711 | One of the following conditions (A), (B) or (C) is met: (A) (a), (b) and (c) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are more than 15°C (59°F) at engine start (b) Soak time is more than 5 hours (c) After normal driving for over 10 min. and 5 km (3 mile) or more, ATF temperature is less than 20°C (68°F) (B) Both (a) and (b) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are more than -10°C (14°F) at engine start (b) After normal driving for over 18 min. and 20 sec. and 8 km (5 mile) or more, ATF temperature is less than 20°C (68°F) (C) Both (a) and (b) are detected: (2-trip detection logic) (a) Engine coolant temperature is less than 35°C (95°F) at engine start (b) ATF temperature is 110°C (230°F) or more when engine coolant temperature reaches 60°C (140°F) | ATF temperature sensor |
This DTC indicates that there is a problem with output signals from the automatic transmission fluid (ATF) temperature sensor and that the sensor itself is defective. The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature and detects an open or short in the ATF temperature circuit or a fault of the ATF temperature sensor.
After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the TCM interprets this as a fault, and turns on the MIL.
The Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value for use by the TCM.
The TCM applies a voltage to the temperature sensor through terminal OIL of the TCM.
The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.
The TCM calculates the fluid temperature based on the voltage signal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0711 | One of the following conditions (A), (B) or (C) is met: (A) (a), (b) and (c) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are more than 15°C (59°F) at engine start (b) Soak time is more than 5 hours (c) After normal driving for over 10 min. and 5 km (3 mile) or more, ATF temperature is less than 20°C (68°F) (B) Both (a) and (b) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are more than -10°C (14°F) at engine start (b) After normal driving for over 18 min. and 20 sec. and 8 km (5 mile) or more, ATF temperature is less than 20°C (68°F) (C) Both (a) and (b) are detected: (2-trip detection logic) (a) Engine coolant temperature is less than 35°C (95°F) at engine start (b) ATF temperature is 110°C (230°F) or more when engine coolant temperature reaches 60°C (140°F) | ATF temperature sensor |
This DTC indicates that there is a problem with output signals from the automatic transmission fluid (ATF) temperature sensor and that the sensor itself is defective. The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature and detects an open or short in the ATF temperature circuit or a fault of the ATF temperature sensor.
After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the TCM interprets this as a fault, and turns on the MIL.
The Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value for use by the TCM.
Scheme 1197
The TCM applies a voltage to the temperature sensor through terminal OIL of the TCM.
The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.
The TCM calculates the fluid temperature based on the voltage signal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0712 | ATF temperature sensor resistance is less than 79 ohms for 0.5 sec. or more (1-trip detection logic) | Short in ATF temperature sensor circuit Transmission wire ATF temperature sensor TCM |
| P0713 | ATF temperature sensor resistance is more than 156 kohms for 0.5 seconds or more. Either of the following conditions is met (1 trip detection logic) | Open in ATF temperature sensor circuit Transmission wire ATF temperature sensor TCM |
| Condition (A): 8 minutes and 52 sec. or more have elapsed after the engine start when engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less. | ||
| Condition (B): 10 seconds or more have elapsed after the engine start when engine coolant temperature and intake air temperature are more than -29.375°C (- 20.875°F). |
These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor circuit. The automatic transmission fluid (ATF) temperature sensor converts ATF temperature into an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature, and the TCM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 ohms*1 or more than 156 kohms*2, the TCM interprets this as a fault in the ATF sensor or wiring. The TCM will turn on the MIL and store the DTC.
*1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.
*2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
HINT
The ATF temperature can be checked on the Techstream display.
This sensor detects the rotation speed of the turbine which shows the input revolution (speed) of the transaxle. By comparing the input turbine speed signal (NT) 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 shifts.
Scheme 1198
| *1 | Counter Gear | *2 | Clutch Drum |
|---|---|---|---|
| *3 | Output Speed Sensor NC | *4 | Input Speed Sensor NT |
TEXT IN ILLUSTRATION
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0715 | When the speed sensor input voltage is either more than 1.9 V or less than 0.1 V for 4.5 seconds or more.(1-trip detection logic) | Transmission revolution sensor (speed sensor NT) Transmission wire TCM |
| P0717 | ECM detects conditions (a), (b) and (c) continuously for 5 sec. or more: (1-trip detection logic) (a) Vehicle speed: 50 km/h (31 mph) or more (b) Park/neutral position switch (STAR and R) is OFF (c) Speed sensor (NT): less than 300 rpm |
The NT terminal of the TCM detects a revolution signal from the speed sensor (NT) (input RPM). The TCM calculates gear shifts comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd, 4th or 5th gear with the shift lever in D, if the input shaft revolution (speed) is less than 300 rpm*1 although the output shaft revolution (speed) is more than 1000 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 50 km/h (31 mph) or more.
The purpose of this circuit is to prevent the engine from stalling when the brakes are suddenly applied while driving in the lock-up condition.
When the brake pedal is depressed, this switch sends a signal to the TCM. Then the TCM cancels the operation of the lock-up clutch while braking is in progress.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0724 | The stop light switch remains ON even when the vehicle is driven in a STOP (less than 3 km/h (2 mph)) and GO (30 km/h (19 mph) or more) fashion 5 times. (2-trip detection logic). | Short in stop light switch signal circuit Stop light switch TCM |
This DTC indicates that the stop light switch remains ON. When the stop light switch remains ON during "stop and go" driving, the TCM interprets this as a fault in the stop light switch, illuminates the MIL, and stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) five times for two consecutive driving cycles in order to set this DTC.
SYSTEM DESCRIPTION
The TCM uses signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, intermediate (counter gear) speed sensor and crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The TCM monitors the engagement of the clutch using the turbine (input) speed sensor, intermediate (counter gear) speed sensor and crankshaft position sensor.
Then 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 SL, valve body and torque converter mechanical problems.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0741 | 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 ON. | Shift solenoid valve SL remains closed Valve body is blocked Torque converter assembly Automatic transaxle (clutch, brake or gear etc.) Line pressure is too low |
Torque converter lock-up is controlled by the TCM based on the speed sensor (NT), 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 the input turbine rpm (NT) to the counter gear rpm (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to shift solenoid SL. When SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter assembly.
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 SL or lock-up system performance. The TCM will turn on the MIL and store the DTC.
HINT
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 the input turbine speed.)
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 |
|---|---|---|
| P0746 | The engine revs freely when 1st, 2nd, 3rd, or 4th gear is commanded (2-trip detection logic). When either of the following is detected twice (2-trip detection logic): When 5th gear is commanded, 4th gear is engaged. When 6th gear is commanded, 4th gear is engaged | Shift solenoid valve SL1 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 [03/2012 - ] .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0748 | The TCM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gears. (1-trip detection logic) Output signal duty equals 100%. (NOTE: SL1 output signal duty is less than 100% under normal condition.) | Open or short in shift solenoid valve SL1 circuit Shift solenoid valve SL1 TCM |
This DTC indicates an open or short in the shift solenoid valve SL1 circuit. 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. The TCM also 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.)
While driving and shifting between 4th and 5th gears, if the TCM detects an open or short in the shift solenoid valve SL1 circuit, the TCM determines there is a malfunction. Refer to FAIL-SAFE CHART [03/2012 - ] .
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 |
|---|---|---|
| P0776 | The engine revs freely when 4th, 5th, or 6th gear is commanded (2-trip detection logic). When any of the following is detected twice (2-trip detection logic): When 1st gear is commanded, 4th gear is engaged. When 2nd gear is commanded, 4th gear is engaged. When 3rd gear is commanded, 4th gear is engaged. | Shift solenoid valve SL2 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 [03/2012 - ] .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0778 | The TCM checks for an open or short in the shift solenoid valve SL2 circuit while driving and shifting gears. (1-trip detection logic) Output signal duty equals to 100%. (NOTE: SL2 output signal duty is less than 100% under normal condition.) | Open or short in shift solenoid valve SL2 circuit Shift solenoid valve SL2 TCM |
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the TCM detects the problem and illuminates the MIL and stores the DTC. The TCM also 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.)
While driving and shifting gears, if the TCM detects an open or short in the shift solenoid valve SL2 circuit, the TCM determines there is a malfunction. Refer to FAIL-SAFE CHART [03/2012 - ] .
This sensor detects the rotation speed of the counter gear which shows the output speed of transaxle. By comparing the input turbine speed signal (NT) 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 shifts.
| *1 | Counter Gear | *2 | Clutch Drum |
|---|---|---|---|
| *3 | Output Speed Sensor NC | *4 | Input Speed Sensor NT |
TEXT IN ILLUSTRATION
| 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 gear shifts by comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd, 4th or 5th gear with the shift lever in D, if the input shaft revolution is less than 300 rpm*1 although the output shaft revolution is more than 1000 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 50 km/h (31 mph) or more.
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.
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 [03/2012 - ] .
| 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 [03/2012 - ] .
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 1199
| 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.
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 1200
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 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 assembly 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 assembly.
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 1201
*: 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 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.
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 [03/2012 - ]
| 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 [03/2012 - ] .
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.
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.
