FAIL-SAFE FUNCTION


BHE050201026T06

• In the fail-safe function, minimum vehicle drivability is obtained by changing the signals that are determined to be malfunctions by the malfunction detection function to the preset values, and limiting TCM control.

DTC No.

On-board diagnostic function

Detection condition

Fail-safe

TCC

P0705
Transmission range (TR) switch circuit malfunction (short to power supply)
• Two or more range signals are input from the TR switch for 12 s or more.
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0706
Transmission range (TR) switch circuit malfunction (open circuit/short to ground)
• No range signal is input from the TR switch for 100 s or more.
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0707
M range switch, up switch or down switch circuit malfunction (open circuit/short to ground)

M range switch circuit malfunction

• M range switch off with up or down switch on.
• M range switch remains on for 10 s or more except in D range.

Up switch or down switch circuit malfunction

• When all of the following conditions are met:
– M range switch off.
– Except D range.
– Up or down switch remains on for 10 s or more.

M range switch circuit malfunction

• Inhibits manual mode

Up switch or down switch circuit malfunction

• Inhibits manual shifting using the up switch or down switch
Enabled
P0708
Steering shift switch circuit malfunction (open circuit/short to ground)
• Signal from shift control switch is 0.5 V or less, or 4.7 V or more for 10 s or more.
• Inhibits manual shifting using the steering shift switch
Enabled
P0712
Transmission fluid temperature (TFT) sensor circuit malfunction (short to ground)
• Signal from TFT sensor is 0.1 V or less for 150 s or more.
• Engine coolant temperature signal is used for shifting.
• Feedback control disabled
• Torque reduction control disabled
• If the ECT has a malfunction, ATF temperature is controlled at 80 °C {176 °F}
Enabled
P0713
Transmission fluid temperature (TFT) sensor circuit malfunction (open circuit/short to power supply)
• Vehicle speed is 20 km/h {12.4 mph} or more, and signal from TFT sensor is 2.4 V or more for 150 s or more.
• Engine coolant temperature signal is used for shifting.
• Feedback control disabled
• Torque reduction control disabled
• If the ECT has a malfunction, ATF temperature is controlled at 80 °C {176 °F}
Enabled
P0715
Turbine sensor circuit malfunction
• The following condition is detected twice:
– Turbine sensor signal is 300 rpm or less while engine speed is 1,500 rpm or more and vehicle speed is 40 km/h {25 mph} or more in D range for 2 s or more.
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0720
Vehicle speed sensor (VSS) malfunction (open circuit/short to ground)
• While driving in D range at a speed of 2,000 rpm or more (25.5 s or more after shifting to D range), vehicle speed signal is 5 km/h {3 mph} or less for 3.5 s or more.
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0731
Gear 1 incorrect (incorrect gear ratio detected)
• TCM monitors the rotation ratio of the parking gear compared to reverse and high clutch drum when the following monitoring conditions are met. If the rotation ratio is 2.283 or less, or 3.287 or more, the TCM determines that there is malfunction.
Monitoring condition:
– 2 s or more after shifting to D range
– Vehicle speed 10 km/h {6 mph} or more
– Engine speed 1,000 rpm or more
– Turbine speed 400 rpm or more
– Ratio between engine speed and turbine speed less than 1.1
– Throttle opening angle 12.5 % or more
– Engine torque 80 N·m {8.2 kgf·m, 59 ft·lbf} or more
– ATF temperature within 20-150 °C {68-302 °F}
– None of the following are present: DTC P0705, P0706, P0712, P0713, P0715, P0720, P0753, P0758, P0763, P0768, P0960, U0073, U0100.
N/A
Disabled
P0732
Gear 2 incorrect (incorrect gear ratio detected)
• TCM monitors the rotation ratio of the parking gear compared to reverse and high clutch drum when the following monitoring conditions are met. If the rotation ratio is 1.266 or less, or 1.824 or more, the TCM determines that there is malfunction.
Monitoring condition:
– 2 s or more after shifting to D range
– Vehicle speed 10 km/h {6 mph} or more
– Engine speed 1,000 rpm or more
– Turbine speed 1,000 rpm or more
– Ratio between engine speed and turbine speed less than 1.1
– Throttle opening angle 12.5 % or more
– Engine torque 65 N·m {6.6 kgf·m, 48 ft·lbf} or more
– ATF temperature within 20-150 °C {68-302 °F}
– None of the following are present: DTC P0705, P0706, P0712, P0713, P0715, P0720, P0753, P0758, P0763, P0768, P0960, U0073, U0100.
N/A
Disabled
P0733
Gear 3 incorrect (incorrect gear ratio detected)
• TCM monitors the rotation ratio of the parking gear compared to reverse and high clutch drum when the following monitoring conditions are met. If the rotation ratio is 0.819 or less, or 1.181 or more, the TCM determines that there is malfunction.
Monitoring condition:
– 2 s or more after shifting to D range
– Vehicle speed 20 km/h {12 mph} or more
– Engine speed 1,000 rpm or more
– Turbine speed 1,000 rpm or more
– Ratio between engine speed and turbine speed less than 1.1
– Throttle opening angle 12.5 % or more
– Engine torque 50 N·m {5.1 kgf·m, 37 ft·lbf} or more
– ATF temperature within 20-150 °C {68-302 °F}
– None of the following are present: DTC P0705, P0706, P0712, P0713, P0715, P0720, P0753, P0758, P0763, P0768, P0960, U0073, U0100.
N/A
Disabled
P0734
Gear 4 incorrect (incorrect gear ratio detected)
• TCM monitors the rotation ratio of the parking gear compared to reverse and high clutch drum when the following monitoring conditions are met. If the rotation ratio is 0.568 or less, or 0.819 or more, the TCM determines that there is malfunction.
Monitoring condition:
– 2 s or more after shifting to D range
– Vehicle speed 40 km/h {25 mph} or more.
– Engine speed 1,000 rpm or more
– Turbine speed 1,000 rpm or more
– Ratio between engine speed and turbine speed less than 1.1
– Throttle opening angle 12.5 % or more
– Engine torque 50 N·m {5.1 kgf·m, 37 ft·lbf} or more
– ATF temperature within 20-150 °C {68-302 °F}
– None of the following are present: DTC P0705, P0706, P0712, P0713, P0715, P0720, P0753, P0758, P0763, P0768, P0960, U0073, U0100.
N/A
Disabled
P0743
Torque converter clutch (TCC) solenoid valve circuit malfunction (open circuit/short to ground or power supply)
• Open or short circuit in TCC solenoid signal system (when the TCM monitors solenoid output voltage, voltage that differs from the ON/OFF signal output by CPU in TCM is detected)
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0748
Pressure control solenoid circuit malfunction (open circuit/short to ground or power supply)
• Open or short circuit in pressure control solenoid signal system (when the TCM monitors solenoid output voltage, voltage that differs from the ON/OFF signal output by CPU in TCM is detected)
• Stops driving of pressure control solenoid valve (OFF).
Enabled
P0753
Shift solenoid A circuit malfunction (open circuit/short to ground or power supply)
• Open or short circuit in shift solenoid A signal system (when the TCM monitors solenoid output voltage, voltage that differs from the ON/OFF signal output by CPU in TCM is detected)
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0758
Shift solenoid F circuit malfunction (open circuit/short to ground or power supply)
• Open or short circuit in shift solenoid F signal system (when the TCM monitors solenoid output voltage, the voltage that differs from the ON/OFF signal output by CPU in TCM is detected)
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0763
Shift solenoid B circuit malfunction (open circuit/short to ground or power supply)
• Open or short circuit in shift solenoid B signal system (when the TCM monitors solenoid output voltage, voltage that differs from the ON/OFF signal output by CPU in TCM is detected).
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0768
Shift solenoid C circuit malfunction (open circuit/short to ground or power supply)
• Open or short circuit in shift solenoid C signal system (when the TCM monitors solenoid output voltage, voltage that differs from the ON/OFF signal output by CPU in TCM is detected).
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P0841
Oil pressure switch B circuit malfunction
• When driving, hydraulic pressure should be generated in the 2-4 brake, but oil pressure switch B does not turn on.
• When driving, hydraulic pressure should not be generated in the 2-4 brake, but oil pressure switch B does not turn off.
N/A
Disabled
P0846
Oil pressure switch C circuit malfunction
• When driving, hydraulic pressure should be generated in the high clutch, but oil pressure switch C does not turn on.
• When driving, hydraulic pressure should not be generated in the high clutch, but oil pressure switch C does not turn off.
N/A
Disabled
P0871
Oil pressure switch F circuit malfunction
• When driving, hydraulic pressure should be generated in the low and reverse brake, but oil pressure switch F does not turn on.
• When driving, hydraulic pressure should not be generated in the low and reverse brake, but oil pressure switch F does not turn off.
N/A
Disabled
P0960
GND return circuit malfunction
• TCM detects an open circuit in the GND return signal line from the solenoid valve.
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled
P1759
2-4 brake fail-safe valve malfunction
• TCM detects 2-4 brake fail-safe valve malfunction.
N/A
Disabled
P1764
Low and reverse brake fail-safe valve malfunction
• TCM detects low and reverse brake fail-safe valve malfunction.
N/A
Disabled
U0073
CAN bus off
• CAN controller damaged.
• CAN communication is stopped
Disabled
U0100
TCM cannot receive any signals from the PCM
• TCM cannot receive any signals from the PCM.
• Driving restricted to 3GR
• Stops operation of TCC solenoid valve (OFF).
Disabled