FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.

P0735




DTC P1779 (P0731): 1st Gear Incorrect Ratio
DTC P1780 (P0732): 2nd Gear Incorrect Ratio
DTC P1781 (P0733): 3rd Gear Incorrect Ratio
DTC P1782 (P0734): 4th Gear Incorrect Ratio
DTC P1783 (P0735): 5th 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 (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
- 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 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)
- If DTC P1779 (P0731) 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 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).

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 (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
- 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 (P1715): 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)
- If DTC P1780 (P0732) 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 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).

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 (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
- 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 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)
- If DTC P1781 (P0733) 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 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).

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 (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
- 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 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)
- 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 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).

DESCRIPTIONS OF MONITOR METHODS[ DTC P1783 (P0735)][ 5A/T]

- In 5th 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
- 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)][ 5A/T]





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: 5th 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) / 5th gear ratio] or more. (4 seconds)
- Output speed: [(input speed - 200 r/min) / 5th gear ratio] or less. (4 seconds)
- 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 5th gear fixed (5th gear in sport mode).

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 (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
- 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)
- If DTC P1784 (P0736) 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 P1784 (P0736)]

Start the engine, and drive in "R" range at 15 km/h (9 mph) or more for 10 seconds.

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
- 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 accumrator
- Electrical noise generated

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read the A/T diagnostic trouble code.





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Check for A/T diagnostic trouble code.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC set?

YES [DTC P1766 (P0715) set] : Refer to P1766, DTC P1766 (P0715): Input Shaft Speed Sensor System.

YES [DTC P1767 (P0720) set] : Refer to P1767, DTC P1767 (P0720): Output Shaft Speed Sensor System.

YES [DTC P1773 (P0753) set] : Refer to P1773, DTC P1773 (P0753): Low-Reverse Solenoid Valve System.

YES [DTC P1774 (P0758) set] : Refer to P1774, DTC P1774 (P0758): Underdrive Solenoid Valve System.

YES [DTC P1775 (P0763) set] : Refer to P1775, DTC P1775 (P0763): Second Solenoid Valve System.

YES [DTC P1776 (P0768) set] : Refer to P1776, DTC P1776 (P0768): Overdrive Solenoid Valve System.

YES [DTC P1777 (P0773) set] : Refer to , DTC P1777 (P0773): Reduction Solenoid Valve System [5A/T].

NO Go to Step 2.

STEP 2. Check the hydraulic pressure.

Each hydraulic pressure of the elements below, which DTCs indicate, should be within the standard value. Hydraulic Pressure Test.

- DTC P1779 (P0731): Underdrive clutch, low-reverse brake and reduction brake[ 5A/T]
- DTC P1780 (P0732): Underdrive clutch, second brake and reduction brake[ 5A/T]
- DTC P1781 (P0733): Underdrive clutch, overdrive clutch and reduction brake[ 5A/T]
- DTC P1782 (P0734): Overdrive clutch, underdrive clutch[ 5A/T] second brake[ 4A/T] and direct clutch[ 5A/T]
- DTC P1783 (P0735)[ 5A/T]: Overdrive clutch, second brake and direct clutch
- DTC P1784 (P0736): Reverse clutch and low-reverse brake

Q. Are the hydraulic pressures within the standard value range?

YES : Go to Step 5.
NO [out of range in one place] : Go to Step 4.
NO [out of range in all places] : Go to Step 3.
STEP 3. Adjust the line pressure.

Adjust the line pressure. Refer to Adjustments, Line Pressure Adjustment.
Then check the symptom.

Q. Is the symptom eliminated?

YES The procedure is complete.
NO Go to Step 4.
STEP 4. Disassemble and clean the valve body.





Check the O-ring installation bolts for looseness and the valve body for damage. Repair or replace the faulty parts. Valve Body Disassembly and Assembly Valve Body [4A/T] or Valve Body Disassembly and Assembly Valve Body [5A/T].
Replace the valve body assembly if the damage is too extensive. Then check the symptom.

Q. Is the symptom eliminated?

YES The procedure is complete.

NO Go to Step 6.

STEP 5. Replace the PCM.

(1)Replace the PCM. When the PCM is replaced, register the encrypted code. Immobilizer System.

(2)Test drive the vehicle.

(3)Check for A/T diagnostic trouble code.

Q. Were any A/T DTCs set?

YES Go to Step 6.
NO The procedure is complete.
STEP 6. Overhaul the A/T.









(1)Replace the following parts.

- If DTC P1779 (P0731), DTC P1780 (P0732), or DTC P1781 (P0733) are set individually or in a group, replace the underdrive clutch. Underdrive Clutch and Input Shaft Disassembly and Assembly Underdrive Clutch and Input Shaft[ 4A/T] or Underdrive Clutch and Input Shaft Disassembly and Assembly Underdrive Clutch and Input Shaft[ 5A/T].
- If DTC P1781 (P0733), DTC P1782 (P0734) or DTC P1783 (P0735)[ 5A/T] are set individually or in a group, replace the overdrive clutch. Reverse and Overdrive Clutch Disassembly and Assembly Reverse and Overdrive Clutch[ 4A/T] or Reverse and Overdrive Clutch Disassembly and Assembly Reverse and Overdrive Clutch[ 5A/T].
- If DTC P1784 (P0736) is set, replace the reverse clutch. Reverse and Overdrive Clutch Disassembly and Assembly Reverse and Overdrive Clutch[ 4A/T] or Reverse and Overdrive Clutch Disassembly and Assembly Reverse and Overdrive Clutch[ 5A/T].
- If DTC P1779 (P0731) or DTC P1784 (P0736) are set individually or in a group, replace the low-reverse brake. Transaxle Disassembly and Assembly Transaxle[ 4A/T] or Transaxle Disassembly and Assembly Transaxle[ 5A/T].
- If DTC P1780 (P0732), DTC P1782 (P0734)[ 4A/T] or DTC P1783 (P0735)[ 5A/T] are set individually or in a group, replace the second brake. Transaxle Disassembly and Assembly Transaxle[ 4A/T] or Transaxle Disassembly and Assembly Transaxle[ 5A/T].
- If DTC P1779 (P0731), DTC P1780 (P0732)[ 5A/T] or DTC P1781 (P0733)[ 5A/T] are set, replace the one-way clutch. Planetary Gear Disassembly and Assembly Planetary Gear[ 4A/T] or Planetary Gear Disassembly and Assembly Planetary Gear[ 5A/T].
- If DTC P1782 (P0734) or DTC P1783 (P0735) are set individually or in a group, replace the direct clutch. Transaxle Disassembly and Assembly Transaxle[ 4A/T] or Transaxle Disassembly and Assembly Transaxle[ 5A/T].
- If DTC P1779 (P0731), DTC P1780 (P0732), DTC P1781 (P0733) or DTC P1784 (P0736) are set individually or in a group, replace the reduction brake[ 5A/T]. Transaxle Disassembly and Assembly Transaxle.
(2)Test drive the vehicle.
(3)Check for A/T diagnostic trouble code.

Q. Are any A/T DTCs set again?

YES An A/T DTC may have set due to external radio frequency interference
(RFI) possibly caused by cellular phone activity, or aftermarket components installed on the vehicle.

NO The procedure is complete.