DESCRIPTION
The Park/Neutral Position (PNP) switch detects the shift lever position and sends signals to the ECM.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0705 | One of the following conditions is met: (A) Any 2 or more of the following signals are ON simultaneously (2-trip detection logic): P input signal is ON N input signal is ON NSW input signal is ON R input signal is ON D input signal is ON (B) Any of the following signals is ON for 2.0 sec. or more with the shift lever in S (2-trip detection logic): P input signal is ON N input signal is ON NSW input signal is ON R input signal is ON (C) All switches are OFF simultaneously for P, R, N, D and NSW (2-trip detection logic). | Open or short in park/neutral position switch circuit Transmission control switch (transmission floor shift assembly) Park/neutral position switch ECM |
MONITOR DESCRIPTION
This DTC indicates a problem with the park/neutral position switch and wire harness in the park/neutral position switch circuit.
The park/neutral position switch detects the shift lever position (P, R, N, D or S) and sends a signal to the ECM.
For security, 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 ECM determines that there is a problem with the switch or related parts if it receives more than 1 position signal simultaneously. The ECM will illuminate the MIL and store the DTC.
The ATF (Automatic Transmission Fluid) temperature sensor converts the ATF temperature into a resistance value which is input into the ECM.
The ECM applies a voltage to the temperature sensor through ECM terminal THO1.
The sensor resistance changes with the ATF temperature.
One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature becomes higher.
The ECM calculates the ATF temperature based on the voltage signal.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0711 | Either condition is met: 1. Conditions (a), (b) and (c) are detected (2-trip detection logic): (a) After the engine is stopped, 5 hours or more elapse before the engine is started. (b) Intake air and engine coolant temperatures are 15°C (59°F) or higher after the engine is started. (c) ATF temperature is below 20°C (68°F) after 16 min. and 40 sec. or more have passed after the engine is started and the vehicle has been driven for 7.5 km (4.6 miles) or more. 2. Conditions (a) and (b) are detected (2-trip detection logic): (a) Engine coolant temperature is below 35°C (95°F) after the engine is started. (b) ATF temperature is 95°C (203°F) or higher when the engine coolant temperature reaches 60°C (140°F) after 10 sec. or more. | No. 1 ATF temperature sensor (transmission wire) |
This DTC indicates that there is a problem with the output from the Automatic Transmission Fluid (ATF) temperature sensor and that the sensor itself is defective. The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature sensor circuit or a fault in the ATF temperature sensor.
After driving 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 ECM interprets this as a fault, turns on the MIL and stores the DTC.
When the ATF temperature is 95°C (203°F) or higher and the engine coolant temperature reaches 60°C (140°F) after a cold start, the ECM also determines this as a fault, turns on the MIL and stores the DTC.
Refer to DTC P0711. Refer to DESCRIPTION .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0712 | ATF temperature sensor resistance is below 79 ohms for 0.5 sec. or more (1-trip detection logic). | Short in No. 1 ATF temperature sensor circuit No. 1 ATF temperature sensor (transmission wire) ECM |
| P0713 | ATF temperature sensor resistance is higher than 156 kohms for 0.5 sec. or more and either condition is met (1-trip detection logic): (A) 550 sec. or more have elapsed after the engine start when the engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less. (B) 10 sec. or more have elapsed after the engine start when the engine coolant temperature and intake air temperature are higher than -29.375°C (-20.875°F). | Open in No. 1 ATF temperature sensor circuit No. 1 ATF temperature sensor (transmission wire) ECM |
The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is below 79 ohms*1 or higher than 156 kohms*2, the ECM interprets this as a fault in the ATF temperature sensor or wiring. The ECM will illuminate the MIL and store the DTC.
HINT
- *1: 150°C (302°F) or higher is indicated regardless of the actual ATF temperature.
- *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
- The ATF temperature can be checked on the Techstream display.
This sensor detects the rotation speed of the turbine which indicates the input speed of the transmission. By comparing the input turbine speed signal NT with the counter gear speed sensor signal SP2, the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0717 | All conditions are met for 5 sec. or more (1-trip detection logic): (a) Gear change: not performed. (b) Gear position: 4th or 5th. (c) T/M input shaft speed: 300 RPM or less. (d) T/M output shaft speed: 1000 RPM or more. (e) Park/neutral position switch: R input signal is OFF. (f) Shift solenoid valves and park/neutral position switch: in normal operation. | Open or short in speed sensor NT circuit Speed sensor NT ECM Automatic transmission (clutch, brake, gear, etc.) |
Reference: Inspect using an oscilloscope.
Check the waveform of the ECM connector.
Standard
| Terminal No. (Symbol) | Tool Setting | Condition | Specified Condition |
|---|---|---|---|
| B38-3 (NT+) - B38-4 (NT-) | 1 V/DIV., 2 msec./DIV. | Engine idling (shift lever in P or N) | Refer to illustration |
Scheme 1201
This DTC indicates that a pulse is not output from the speed sensor NT (turbine (input) speed sensor) or is output only a little. The NT terminal of the ECM detects the pulse signal from the speed sensor NT (input RPM). The ECM outputs a gear shift signal by comparing the input speed sensor NT signal with the output speed sensor SP2 signal.
While the vehicle is operating in 4th or 5th gear with the shift lever in D, if the input shaft speed is less than 300 RPM*1 although the output shaft speed is 1000 RPM or more*2, the ECM detects the trouble, illuminates the MIL and stores the DTC.
HINT
- *1: A pulse is not output or is irregularly output.
- *2: The vehicle speed is approximately 50 km/h (30 mph) or more.
The speed sensor SP2 detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage is generated in the speed sensor SP2 coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the ECM. The parking gear on the rear planetary gear is used as the timing rotor for this sensor.
The gear shift point and lock-up timing are controlled by the ECM based on the signals from this vehicle speed sensor and the throttle position sensor signal.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0722 | All conditions are met 500 times or more continuously (2-trip detection logic): (a) No signal from speed sensor SP2 is input to the ECM while 4 pulses of the No. 1 vehicle speed sensor signal are sent. (b) Vehicle speed is 9 km/h (6 mph) or more for at least 5 sec. (c) Park/neutral position switch is OFF. | Open or short in speed sensor SP2 circuit Speed sensor SP2 ECM Automatic transmission (clutch, brake, gear, etc.) |
Reference: Inspect using an oscilloscope.
Check the waveform of the ECM connector.
Standard
| Terminal No. (Symbol) | Tool Setting | Condition | Specified Condition |
|---|---|---|---|
| B38-9 (SP2+) - B38-10 (SP2-) | 2 V/DIV., 20 msec./DIV. | Vehicle speed 20 km/h (12 mph) | Refer to illustration below |
Scheme 1202
The output speed sensor SP2 monitors the output shaft speed. The ECM controls the gear shift point and lock-up timing based on the signals from the output speed sensor SP2 and throttle position sensor.
If the ECM detects no signal from the output shaft speed sensor SP2 even while the vehicle is moving, it will conclude that there is a malfunction of the output speed sensor SP2. The ECM will illuminate the MIL and store a DTC.
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0746 | The gear required by the ECM does not match the actual gear when driving (2-trip detection logic). | Shift solenoid valve SL1 remains closed Shift solenoid valve SR remains open or closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.) |
| P0771 | The gear required by the ECM does not match the actual gear when driving (2-trip detection logic). | Shift solenoid valve SR remains open or closed Shift solenoid valve SL1 remains closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.) |
These DTCs indicate a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valves SR and SL1.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which are controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. Refer to FAIL-SAFE CHART .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0748 | The ECM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gear (1-trip detection logic). Output signal duty equals 100%. HINT: SL1 output signal duty is less than 100% under normal conditions. | Open or short in shift solenoid valve SL1 circuit Shift solenoid valve SL1 ECM |
This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Then the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit.
While driving and shifting between 4th and 5th gears, if the ECM detects an open or short in the shift solenoid valve SL1 circuit, the ECM determines there is a malfunction. Refer to FAIL-SAFE CHART .
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0751 | Gear required by the ECM does not match the actual gear when driving (2-trip detection logic). | Shift solenoid valve S1 remains open or closed Shift solenoid valve SLT remains open or closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.) |
This DTC indicates a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valve S1.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0756 | Gear required by ECM does not match actual gear when driving (2-trip detection logic). | Shift solenoid valve S2 remains open or closed Shift solenoid valve SLT remains open or closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.) |
This DTC indicates a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valve S2.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0776 | Gear required by the ECM does not match the actual gear when driving (2-trip detection logic). | Shift solenoid valve SL2 remains open Shift solenoid valve SLT remains open or closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.) |
This DTC indicates a stuck ON malfunction of the shift solenoid valve SL2.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which are controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. Refer to FAIL-SAFE CHART .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0778 | The ECM 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 ratio equals 100%. HINT: SL2 output signal duty is less than 100% under normal conditions. | Open or short in shift solenoid valve SL2 circuit Shift solenoid valve SL2 ECM |
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Then the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit.
While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction. Refer to FAIL-SAFE CHART .
The 1-2 shift valve performs shifting to 1st gear and other gears.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0781 | Gear required by the ECM does not match the actual gear when driving (2-trip detection logic). | Valve body is blocked or stuck (1-2 shift valve) Shift solenoid valve SLT remains open or closed Automatic transmission (clutch, brake, gear, etc.) |
This DTC indicates that the 1-2 shift valve in the valve body is locked in the direction that the spring compresses.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF and controls the oil pressure applied to the valves in the valve body.
The ECM calculates the actual transmission gear by comparing the signals from the input speed sensor NT and output speed sensor SP2. The ECM can detect mechanical problems in the shift solenoids, valve body and automatic transmission (clutch, brake, gear, etc.). If the ECM detects that the actual gear position and commanded gear position are different, it will illuminate the MIL and store the DTC.
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which is controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to the fail-safe chart. Refer to FAIL-SAFE CHART .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0973 | The ECM detects a short in the solenoid valve S1 circuit 2 times when solenoid valve S1 is operated (1-trip detection logic). | Short in shift solenoid valve S1 circuit Shift solenoid valve S1 ECM |
| P0974 | The ECM detects an open in the solenoid valve S1 circuit 2 times when solenoid valve S1 is not operated (1-trip detection logic). | Open in shift solenoid valve S1 circuit Shift solenoid valve S1 ECM |
These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. When the shift solenoid valve S1 is on, if its resistance is 8 ohms or less, the ECM determines there is a short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is off, if its resistance is 100 kohms or higher, the ECM determines there is an open in the shift solenoid valve S1 circuit. Refer to FAIL-SAFE CHART .
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which is controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to the fail-safe chart. Refer to FAIL-SAFE CHART .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0976 | The ECM detects a short in the solenoid valve S2 circuit 2 times when solenoid valve S2 is operated (1-trip detection logic). | Short in shift solenoid valve S2 circuit Shift solenoid valve S2 ECM |
| P0977 | The ECM detects an open in the solenoid valve S2 circuit 2 times when solenoid valve S2 is not operated (1-trip detection logic). | Open in shift solenoid valve S2 circuit Shift solenoid valve S2 ECM |
These DTCs indicate an open or short in the shift solenoid valve S2 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. When the shift solenoid valve S2 is on, if its resistance is 8 ohms or less, the ECM determines there is a short in the shift solenoid valve S2 circuit.
When the shift solenoid valve S2 is off, if its resistance is 100 kohms or higher, the ECM determines there is an open in the shift solenoid valve S2 circuit. Refer to FAIL-SAFE CHART .
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which is controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to FAIL-SAFE CHART .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0985 | The ECM detects a short in the solenoid valve SR circuit 2 times when solenoid valve SR is operated (1-trip detection logic). | Short in shift solenoid valve SR circuit Shift solenoid valve SR ECM |
| P0986 | The ECM detects an open in the solenoid valve SR circuit 2 times when solenoid valve SR is not operated (1-trip detection logic). | Open in shift solenoid valve SR circuit Shift solenoid valve SR ECM |
These DTCs indicate an open or short in the shift solenoid valve SR circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. When the shift solenoid valve SR is on, if its resistance is 8 ohms or less, the ECM determines there is a short in the shift solenoid valve SR circuit.
When the shift solenoid valve SR is off, if its resistance is 100 kohms or higher, the ECM determines there is an open in the shift solenoid valve SR circuit. Refer to FAIL-SAFE CHART .
The ECM calculates the amount of heat absorbed by the friction material based on the difference in speed (clutch slippage) between the turbine and output shaft. The ECM turns on the MIL and outputs the DTC when the amount of heat absorption exceeds the specified value.
There are two reasons that make the speed different.
- When the shift solenoid valve SLT remains on, oil pressure goes down and clutch engagement force decreases.
- When the shift solenoid valve remains on or off, the gear position commanded by the ECM and the actual gear position are not the same.
Note. If you continue driving under these conditions, the clutch will burn out and the vehicle will no longer be drivable.
Refer to DTC P2714. Refer to DESCRIPTION .
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2716 | Open or short is detected in the shift solenoid valve SLT circuit for 1 sec. or more while driving (1-trip detection logic). | Open or short in shift solenoid valve SLT circuit Shift solenoid valve SLT ECM |
When an open or short in the shift solenoid valve (SLT) circuit is detected, the ECM interprets this as a fault. The ECM will turn on the MIL and store the DTC.
The Automatic Transmission Fluid (ATF) temperature sensor is on the transmission, just in front of the oil cooler inlet pipeline.
If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning light.
HINT
- The temperature of the ATF easily rises when towing, climbing hills, in traffic, etc.
- If the ATF temperature sensor becomes short-circuited, the signal that indicates that the ATF temperature is 150°C (302°F) or higher is input into the ECM.
Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table below.
| No. 2 ATF Temperature Sensor State | Detection Condition | Symptom | Recovery Condition |
|---|---|---|---|
| Sensor is normal | ATF temperature higher than 150°C (302°F) | ATF temperature warning light remains ON | ATF temperature below 135°C (275°F)*1 |
| ATF temperature higher than 130°C (266°F) | Shift point too high | ATF temperature below 110°C (230°F) | |
| Conditions (a) and (b) are met: (a) ATF temperature higher than 130°C (266°F) (b) Engine coolant temperature higher than 95°C (203°F) | Lock-up in 3rd gear*2 | ATF temperature below 110°C (230°F)*1 and engine coolant temperature higher than 95°C (203°F) | |
| Sensor is short-circuited | Any conditions | ATF temperature warning light blinks Shift point too high | Symptoms still occur |
| Engine coolant temperature higher than 95°C (203°F) | Lock-up in 3rd gear*2 | Symptoms still occur |
HINT
*1: When ATF temperature is in the normal range, it decreases to below 135°C (275°F) within 5 minutes with the shift lever in P or N in an idling state.
*2: When ATF temperature is normal, transmission lock-up occurs in 5th gear with the shift lever in D or with the S5 range selected, and in 4th gear with the S4 range selected.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2742 | No. 2 ATF temperature sensor resistance is below 25 ohms (0.046 V) for 0.5 sec. or more (1-trip detection logic). | Short in No. 2 ATF temperature sensor circuit No. 2 ATF temperature sensor (Transmission wire) ECM |
| P2743 | ATF temperature sensor resistance is higher than 156 kohms (4.915 V) for 0.5 sec. or more and either condition is met (1-trip detection logic): (A) 15 min. or more have elapsed after the engine start when the engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less. (B) 10 sec. or more have elapsed after the engine start when the engine coolant temperature and intake air temperature are higher than -29.375°C (-20.875°F). | Open in No. 2 ATF temperature sensor circuit No. 2 ATF temperature sensor (Transmission wire) ECM |
The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature sensor is below 25 ohms*1 or higher than 156 kohms*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ATF temperature warning light blinks and the ECM stores the DTC.
HINT
- *1: 150°C (302°F) or higher is indicated regardless of the actual ATF temperature.
- *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
- The ATF temperature can be checked on the Techstream display.
The ECM 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 1203
Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical problems of the shift solenoid valve SLU, valve body and torque converter clutch.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2757 | Lock-up does not occur when driving in the lock-up range (normal driving at 80 km/h (50 mph)), or lock-up remains ON in the lock-up OFF range (2-trip detection logic). | Shift solenoid valve SLU remains open or closed Valve body is blocked Torque converter clutch assembly Automatic transmission (clutch, brake, gear, etc.) Line pressure is too low |
Torque converter lock-up is controlled by the ECM based on the turbine (input) speed sensor NT, output speed sensor SP2, engine speed, engine load, engine temperature, vehicle speed, transmission temperature and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transmission gear by comparing input turbine speed (NT) to output shaft speed (SP2). When conditions are appropriate, the ECM 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 ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the ECM interprets this as a fault in the shift solenoid valve SLU or lock-up system performance.
The ECM will turn on the MIL and store the DTC.
Example
When either of the following is met, the system judges it as a malfunction.
- There is a difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up (Engine speed is at least 70 RPM more than input turbine speed.)
- There is no difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up off. The difference between engine speed and input turbine speed is less than 35 RPM.
The amount of current flow to the solenoid is controlled by the duty ratio* of the ECM output signal. During the lock-up operation, if the duty ratio increases, the lock-up hydraulic pressure increases.
HINT
*: The duty ratio is the ratio of the current ON time (A) to the total of the current ON and OFF time (A + B). Duty Ratio (%) = A / (A + B) x 100
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2759 | Open or short is detected in the shift solenoid valve SLU circuit for 1 sec. or more while driving (1-trip detection logic). | Open or short in shift solenoid valve SLU circuit Shift solenoid valve SLU ECM |
When an open or short in the shift solenoid valve (SLU) circuit is detected, the ECM determines there is a malfunction. The ECM will turn on the MIL and store this DTC.
After moving the shift lever to S, it is possible to switch the shift range between "1" (S1 range) and "5" (S5 range) using the transmission control switch.
Shifting to "+" once raises the shift range by one, and shifting to "-" once lowers the shift range by one.
Scheme 1204
Scheme 1205
Scheme 1206
Scheme 1207
- INSPECT TRANSMISSION CONTROL SWITCH Disconnect the F76 transmission control switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 (IG) - 7 (S) Shift lever in S, "+" or "-" Below 1 ohms 2 (SFTU) - 5 (E) Shift lever held in "+" (Up-shift) Below 1 ohms 1 (SFTD) - 5 (E) Shift lever held in "-" (Down-shift) Below 1 ohms 3 (IG) - 7 (S) Shift lever not in S, "+" or "-" 10 kohms or higher 2 (SFTU) - 5 (E) Shift lever in S 10 kohms or higher 1 (SFTD) - 5 (E) Shift lever in S 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Transmission Control Switch) NG --> See step 5 OK: Go to next step
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND) Disconnect the F76 transmission control switch connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition F76-3 (IG) - Body ground Ignition switch ON 11 to 14 V F76-3 (IG) - Body ground Ignition switch off Below 1 V Turn the ignition switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F76-5 (E) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a 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 - ECM) Disconnect the F50 ECM connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F50-24 (S) - Body ground Ignition switch ON Shift lever in S, "+" or "-" 11 to 14 V F50-24 (S) - Body ground Ignition switch ON Shift lever not in S, "+" or "-" Below 1 V Turn the ignition switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F50-16 (SFTU) - Body ground Shift lever held in "+" (Up-shift) Below 1 ohms F50-22 (SFTD) - Body ground Shift lever held in "-" (Down-shift) Below 1 ohms F50-16 (SFTU) - Body ground Shift lever in S 10 kohms or higher F50-22 (SFTD) - Body ground Shift lever in S 10 kohms or higher TEXT IN ILLUSTRATION *a Rear view of wire harness connector (to ECM) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422118-S06515700722011092600000)
- REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY). Refer to «REMOVAL»(ref-422110-S33038482502011092600000)