Part 1
DTC P1779 (P0731): 1st Gear Incorrect RatioDTC P1780 (P0732): 2nd Gear Incorrect Ratio
DTC P1781 (P0733): 3rd Gear Incorrect Ratio
DTC P1782 (P0734): 4th Gear Incorrect Ratio
DTC P1783 (P0735): Ruth Gear Incorrect Ratio [5A/T]
DTC P1784 (P0736): Reverse Gear Incorrect Ratio
CIRCUIT OPERATION
^ The input shaft speed sensor generates a pulsed signal of 0 - 5 volts. The pulsed signal frequency increases with an increase in the input shaft speed.
^ The PCM, continuously monitors the input shaft speed signal.
^ The output shaft speed sensor generates a pulsed signal of 0 - 5 volts. The pulsed signal frequency increases with an increase in the output shaft speed.
^ The PCM, continuously monitors the output shaft speed signal.
DESCRIPTIONS OF MONITOR METHODS [DTC P1779 (P0731)]
^ In 1st gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM, judges that step-out in 1st gear has occurred.
MONITOR EXECUTION [DTC P1779 (P0731)]
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [DTC P1779 (P0731)]
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ DTC P1770, P1771 (P0705): Transmission range switch malfunction
^ DTC P1766 (P0715): Input shaft speed sensor malfunction
^ DTC P1767 (P0720): Output shaft speed sensor malfunction
^ DTC P1778 (P0743): Torque converter clutch solenoid malfunction
^ DTC P1773 (P0753): Low-reverse solenoid malfunction
^ DTC P1774 (P0758): Underdrive solenoid malfunction
^ DTC P1775 (P0763): Second solenoid malfunction
^ DTC P1776 (P0768): Overdrive solenoid malfunction
^ DTC P1777 (P0773): Reduction solenoid malfunction [5A/T]
^ DTC P1788 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be normal)
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Transmission range switch
^ Torque converter clutch solenoid
^ Low-reverse solenoid
^ Underdrive solenoid
^ Second solenoid
^ Overdrive solenoid
^ Reduction solenoid [5A/T]
^ A/T control relay
MONITOR EXECUTION DTC P1779 (P0731):
DTC SET CONDITIONS [DTC P1779 (P0731)]
Check Conditions
^ Engine speed: 450 r/min or more.
^ Output speed: 350 r/min or more.
^ Shift stage: 1st gear.
^ Input speed: more than 0 r/min.
^ Transmission fluid temperature sensor voltage: 4.5 volts or less.
^ Voltage of battery: 10 volts or more.
^ Transmission range switch rationality: only one signal.
^ Time after shift changing finish: 2 seconds or more.
Judgement Criteria
^ Output speed: [(input speed - 200 r/min) / 1st gear ratio] or less. (4 seconds)
DESCRIPTIONS OF MONITOR METHODS [DTC P1780 (P0732)]
^ In 2nd gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 2nd gear has occurred.
MONITOR EXECUTION [DTC P1780 (P0732)]
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [DTC P1780 (P0732)]
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ DTC P1770, P1771 (P0705): Transmission range switch malfunction
^ DTC P1766 (P0715): Input shaft speed sensor malfunction
^ DTC P1767 (P0720): Output shaft speed sensor malfunction
^ DTC P1778 (P0743): Torque converter clutch solenoid malfunction
^ If DTC P1779 (P0731) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe measure, and the "N" range light flashes once per second.
OBD-II DRIVE CYCLE PATTERN [DTC P1779 (P0731)]
Start the engine, and drive at 20 km/h (12 mph) or more for 10 seconds, with 1st gear fixed (1st gear in sport mode).
^ DTC P1773 (P0753): Low-reverse solenoid malfunction
^ DTC P1774 (P0758): Underdrive solenoid malfunction
^ DTC P1775 (P0763): Second solenoid malfunction
^ DTC P1776 (P0768): Overdrive solenoid malfunction
^ DTC P1777 (P0773): Reduction solenoid malfunction [5A/T]
^ DTC P1788 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be normal)
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Transmission range switch
^ Torque converter clutch solenoid
^ Low-reverse solenoid
^ Underdrive solenoid
^ Second solenoid
^ Overdrive solenoid
^ Reduction solenoid [5A/T]
^ A/T control relay
LOGIC FLOW CHARTS (Monitor Sequence) DTC P1780 (P0732):
DTC SET CONDITIONS [DTC P1780 (P0732)]
Check Conditions
^ Engine speed: 450 r/min or more.
^ Output speed: 500 r/min or more.
^ Shift stage: 2nd gear.
^ Input speed: more than 0 r/min.
^ Transmission fluid temperature sensor voltage: 4.5 volts or less.
^ Voltage of battery: 10 volts or more.
^ Transmission range switch rationality: only one signal.
^ Time after shift changing finish: 2 seconds or more.
Judgement Criteria
^ Output speed: [(input speed + 200 r/min) 2nd gear ratio] or more. (4 seconds)
^ Output speed: [(input speed - 200 r/min) 2nd gear ratio] or less. (4 seconds)
DESCRIPTIONS OF MONITOR METHODS [DTC P1781 (P0733)]
^ In 3rd gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 3rd gear has occurred.
MONITOR EXECUTION [DTC P1781 (P0733)]
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [DTC P1781 (P0733)]
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ DTC P1770, P1771 (P0705): Transmission range switch malfunction
^ DTC P1766 (P0715): Input shaft speed sensor malfunction
^ DTC P1767 (P0720): Output shaft speed sensor malfunction
^ DTC P1778 (P0743): Torque converter clutch solenoid malfunction
^ If DTC P1780 (P0732) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe measure, and the "N" range light flashes once per second.
OBD-II DRIVE CYCLE PATTERN [DTC P1780 (P0732)]
Start the engine, and drive at 30 km/h (19 mph) or more for 10 seconds, with 2nd gear fixed (2nd gear in sport mode).
^ DTC P1773 (P0753): Low-reverse solenoid malfunction
^ DTC P1774 (P0758): Underdrive solenoid malfunction
^ DTC P1775 (P0763): Second solenoid malfunction
^ DTC P1776 (P0768): Overdrive solenoid malfunction
^ DTC P1777 (P0773): Reduction solenoid malfunction [5A/T]
^ DTC P1788 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be normal)
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Transmission range switch
^ Torque converter clutch solenoid
^ Low-reverse solenoid
^ Underdrive solenoid
^ Second solenoid
^ Overdrive solenoid
^ Reduction solenoid [5A/T]
^ A/T control relay
LOGIC FLOW CHARTS (Monitor Sequence) DTC P1781 (P0733):
DTC SET CONDITIONS [DTC P1781 (P0733)]
Check Conditions
^ Engine speed: 450 r/min or more.
^ Output speed: 900 r/min or more.
^ Shift stage: 3rd gear.
^ Input speed: more than 0 r/min.
^ Transmission fluid temperature sensor voltage: 4.5 volts or less.
^ Voltage of battery: 10 volts or more.
^ Transmission range switch rationality: only one signal.
^ Time after shift changing finish: 2 seconds or more.
Judgement Criteria
^ Output speed: [(input speed + 200 r/min) 3rd gear ratio] or more. (4 seconds)
^ Output speed: [(input speed - 200 r/min) 3rd gear ratio] or less. (4 seconds)
DESCRIPTIONS OF MONITOR METHODS [DTC P1782 (P0734)]
^ In 4th gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in 4th gear has occurred.
MONITOR EXECUTION [DTC P1782 (P0734)]
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [DTC P1782 (P0734)]
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ DTC P1770, P1771 (P0705): Transmission range switch malfunction
^ DTC P1766 (P0715): Input shaft speed sensor malfunction
^ DTC P1767 (P0720): Output shaft speed sensor malfunction
^ DTC P1778 (P0743): Torque converter clutch solenoid malfunction
^ If DTC P1781 (P0733) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe measure, and the "N" range light flashes once per second.
OBD-II DRIVE CYCLE PATTERN [DTC P1781 (P0733)]
Start the engine, and drive at 40 km/h (25 mph) or more for 10 seconds, with 3rd gear fixed (3rd gear in sport mode).
^ DTC P1773 (P0753): Low-reverse solenoid malfunction
^ DTC P1774 (P0758): Underdrive solenoid malfunction
^ DTC P1775 (P0763): Second solenoid malfunction
^ DTC P1776 (P0768): Overdrive solenoid malfunction
^ DTC P1777 (P0773): Reduction solenoid malfunction [5A/T]
^ DTC P1788 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be normal)
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Transmission range switch
^ Torque converter clutch solenoid
^ Low-reverse solenoid
^ Underdrive solenoid
^ Second solenoid
^ Overdrive solenoid
^ Reduction solenoid [5A/T]
^ A/T control relay
LOGIC FLOW CHARTS (Monitor Sequence) DTC P1782 (P0734):
DTC SET CONDITIONS [DTC P1782 (P0734)]
Check Conditions
^ Engine speed: 450 r/min or more.
^ Output speed: 900 r/min or more.
^ Shift stage: 4th gear.
^ Input speed: more than 0 r/min.
^ Transmission fluid temperature sensor voltage: 4.5 volts or less.
^ Voltage of battery: 10 volts or more.
^ Transmission range switch rationality: only one signal.
^ Time after shift changing finish: 2 seconds or more.
Judgement Criteria
^ Output speed: [(input speed + 200 r/min) 4th gear ratio] or more. (4 seconds)
^ Output speed: [(input speed - 200 r/min) 4th gear ratio] or less. (4 seconds)
DESCRIPTIONS OF MONITOR METHODS [DTC P1783 (P0735)] [5A/T]
^ In Ruth gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in reverse gear has occurred.
MONITOR EXECUTION [DTC P1783 (P0735)] [5A/T]
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [DTC P1783 (P0735)] [5A/T]
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ DTC P1770 (P0705): Transmission range switch malfunction (Open circuit)
^ DTC P1771 (P0705): Transmission range switch malfunction (Short circuit)
^ DTC P1766 (P0715): Input shaft speed sensor malfunction
^ DTC P1767 (P0720): Output shaft speed sensor malfunction
^ If DTC P1782 (P0734) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe measure, and the "N" range light flashes once per second.
OBD-II DRIVE CYCLE PATTERN [DTC P1782 (P0734)]
Start the engine, and drive at 40 km/h (25 mph) or more for 10 seconds, with 4th gear fixed (4th gear in sport mode).
^ DTC P1778 (P0743): Torque converter clutch solenoid malfunction
^ DTC P1773 (P0753): Low-reverse solenoid malfunction
^ DTC P1774 (P0758): Underdrive solenoid malfunction
^ DTC P1775 (P0763): Second solenoid malfunction
^ DTC P1776 (P0768): Overdrive solenoid malfunction
^ DTC P1777 (P0773): Reduction solenoid malfunction
^ DTC P1788 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be normal)
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Transmission range switch
^ Torque converter clutch solenoid
^ Low-reverse solenoid
^ Underdrive solenoid
^ Second solenoid
^ Overdrive solenoid
^ Reduction solenoid
^ A/T control relay
LOGIC FLOW CHARTS (Monitor Sequence) DTC P1783 (P0735):
DTC SET CONDITIONS [DTC P1783 (P0735)] [5A/T]
Check Conditions
^ Engine speed: 450 r/min or more.
^ Output speed: 900 r/min or more.
^ Shift stage: Ruth gear.
^ Input speed: more than 0 r/min.
^ Transmission fluid temperature sensor voltage: 4.5 volts or less.
^ Voltage of battery: 10 volts or more.
^ Transmission range switch rationality: only one signal.
^ Time after shift changing finish: 2 seconds or more.
Judgement Criteria
^ Output speed: [(input speed + 200 r/min) Ruth gear ratio] or more. (4 seconds)
^ Output speed: [(input speed - 200 r/min) Ruth gear ratio] or less. (4 seconds)
DESCRIPTIONS OF MONITOR METHODS [DTC P1784 (P0736)]
^ In reverse gear, if a difference between turbine revolution and that value calculated from output revolution equals or exceeds specified value, PCM judges that step-out in reverse gear has occurred.
MONITOR EXECUTION [DTC P1784 (P0736)]
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [DTC P1784 (P0736)]
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ DTC P1770, P1771 (P0705): Transmission range switch malfunction
^ DTC P1766 (P0715): Input shaft speed sensor malfunction
^ DTC P1767 (P0720): Output shaft speed sensor malfunction
^ If DTC P1782 (P0734) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe measure, and the selector lever position indicator light (D, 1 through 4 or 5) flashes once per second.
OBD-II DRIVE CYCLE PATTERN [DTC P1783 (P0735)] [5A/T]
Start the engine, and drive at 50 km/h (31 mph) or more for 10 seconds, with Ruth gear fixed Ruth gear in sport mode).
^ DTC P1778 (P0743): Torque converter clutch solenoid malfunction
^ DTC P1773 (P0753): Low-reverse solenoid malfunction
^ DTC P1774 (P0758): Underdrive solenoid malfunction
^ DTC P1775 (P0763): Second solenoid malfunction
^ DTC P1776 (P0768): Overdrive solenoid malfunction
^ DTC P1777 (P0773): Reduction solenoid malfunction [5A/T]
^ DTC P1788 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be normal)
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Transmission range switch
^ Torque converter clutch solenoid
^ Low-reverse solenoid
^ Underdrive solenoid
^ Second solenoid
^ Overdrive solenoid
^ Reduction solenoid [5A/T]
^ A/T control relay
LOGIC FLOW CHARTS (Monitor Sequence) DTC P1784 (P0736):
DTC SET CONDITIONS [DTC P1784 (P0736)]
Check Conditions
^ Engine speed: 450 r/min or more.
^ Output speed: 100 r/min or more.
^ Shift stage: reverse gear.
^ Input speed: more than 0 r/min.
^ Transmission fluid temperature sensor voltage: 4.5 volts or less.
^ Voltage of battery: 10 volts or more.
^ Transmission range switch rationality: only one signal.
^ Time after shift changing finish: 0.5 second or more.
Judgement Criteria
^ Output speed: [(input speed + 200 r/min) reverse gear ratio] or more. (1 second)
^ Output speed: [(input speed - 200 r/min) / reverse gear ratio] or less. (1 second)
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of the input shaft speed sensor
^ Malfunction of the output shaft speed sensor
^ Malfunction of the PCM
^ Malfunction of the underdrive clutch retainer
^ If DTC P1784 (P0736) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe measure, and the "N" range light flashes once per second.
OBD-II DRIVE CYCLE PATTERN [DTC P1784 (P0736)]
Start the engine, and drive in "R" range at 15 km/h (9 mph) or more for 10 seconds.
^ Malfunction of the transfer drive gear or driven gear [4A/T]
^ Malfunction of the direct planetary carriers [5A/T]
^ Malfunction of clutch system and / or brake system
^ Malfunction of the valve body
^ Malfunction of the accumulator
^ Electrical noise generated