#
FAIL-SAFE FUNCTION [JA5AX-EL]

id050206100600
• In the fail-safe function, minimum vehicle drivability is obtained by changing the signals that are determined as malfunctions by the failure detection function to the preset values, and limiting the TCM control.

DTC No. | On-board diagnostic function | Detection condition | Fail-safe | TCC
--- | --- | --- | --- | ---
P0705 | Transaxle range (TR) switch circuit malfunction (power short circuit) | • Two or more range signals are inputted from TR switch for 5 seconds or more | • TR switch priority D > N > P > R • Inhibits feedback control, SLOPE mode, torque reduction control | Available
P0706 | Transaxle range (TR) switch circuit malfunction (open/ground short circuit) | • No range signal is inputted from TR switch for 100 seconds or more | • Inhibits feedback control, SLOPE mode, torque reduction control | Available
P0711 | Transaxle fluid temperature (TFT) sensor malfunction (stuck) | • TFT sensor signal stays outside normal temperature range for 10 minute or more | - | Available
P0712 | Transaxle fluid temperature (TFT) sensor circuit malfunction (short circuit) | • Signals form TFT sensor are 155 °C {311 °F} or greater for 10 min. | • Inhibits feedback control • Engine coolant temperature signal are used for shifting. | Available
P0713 | Transaxle fluid temperature (TFT) sensor circuit malfunction (open circuit) | • Vehicle speed is 20 km/h {12.4 mph} or greater, and signals from TFT sensor are -30 °C {-22 °F} or less for 150 seconds or more | Available
P0715 | Input/turbine speed sensor circuit malfunction | • Input/turbine speed sensor is 600 rpm or less while engine speed is 1500 rpm or greater and vehicle speed is 40 km/h {24.8 mph} or greater in D ranges. | • Inhibits shift control | Available
P0720 | Vehicle speedometer sensor circuit malfunction | • Parking gear rotation detected by VSS is 150 rpm or less while intermediate sensor 1400 rpm or greater in D range for 2 second or more. | • Inhibits SLOPE mode, feedback control, torque reduction control | Available
P0740 | Torque converter clutch (TCC) system | • RPM difference between crankshaft (engine speed signal) and reverse clutch drum (input/turbine speed sensor signal) exceeds the pre-programmed value | - | Available
P0743 | Torque converter clutch (TCC) solenoid valve malfunction (open/short) | • Open or short in torque converter clutch solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of TCC solenoid valve (OFF) | Inhibition
P0748 | Pressure control solenoid malfunction (open/short) | • Open or short in pressure control solenoid circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of pressure control solenoid, 2-4 brake solenoid valve, and high clutch solenoid valve (OFF) • Inhibit feedback control. | Available
P0751 | Shift solenoid A malfunction (stuck off) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available
P0752 | Shift solenoid A malfunction (stuck on) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available
P0753 | Shift solenoid A malfunction (open/short) | • Open or short in shift solenoid A circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving all ON/OFF type solenoids (OFF) and TCC solenoid valve (OFF) | Inhibition
P0756 | Shift solenoid B malfunction (stuck off) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available
P0757 | Shift solenoid B malfunction (stuck on) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available
P0758 | Shift solenoid B malfunction (open/short) | • Open or short in shift solenoid B circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving all ON/OFF type solenoids (OFF) and TCC solenoid valve (OFF) | Inhibition
P0761 | Shift solenoid C malfunction (stuck off) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available
P0762 | Shift solenoid C malfunction (stuck on) | • Difference between actual gear ratio and gear ratio set in TCM is large | - | Available
P0763 | Shift solenoid C malfunction (open/short) | • Open or short in shift solenoid C circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving all ON/OFF type solenoids (OFF) and TCC solenoid valve (OFF) | Inhibition
P0768 | Reduction timing solenoid valve malfunction (open/short) | • Open or short in reduction timing solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of reduction timing solenoid valve (OFF) | Available
P0773 | Neutral shift solenoid valve malfunction (open/short) | • Open or short in neutral shift solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of neutral shift solenoid valve (OFF) | Available
P0778 | 2-4 brake solenoid valve malfunction (open/short) | • Open or short in 2-4 brake solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of pressure control solenoid, 2-4 brake solenoid valve, and high clutch solenoid valve (OFF) • Inhibit feedback control. | Available
P0791 | Intermediate sensor malfunction (open/short) | • Rotation speed of output gear (intermediate sensor) is low when vehicle speed and engine speed exceed the pre programmed value | • Inhibit feedback control • Inhibits torque reduction control | Available
P0798 | High clutch solenoid valve malfunction (open/short) | • Open or short in high clutch solenoid valve circuit (Voltage different from on/off signal relayed by CPU in TCM is detected while TCM is monitoring solenoid output voltage.) | • Stops driving of pressure control solenoid, 2-4 brake solenoid valve, and high clutch solenoid valve (OFF) • Inhibit feedback control. | Available
P1710 | GND return malfunction | • TCM detects open in GND return signal of solenoid. | - | Available
U0073 | CAN BUS OFF | • CAN controller damaged. | • Throttle valve opening angle is fixed (4/8) at the time in order to determine shift • Maximizes line pressure | Inhibition
U0100 | TCM cannot receive any signals from PCM | • TCM cannot receive any signals from PCM