DTC P0742 [FS5A-EL]

DTC P0742	Torque converter clutch (TCC) stuck on
DETECTION CONDITION	• All of the following conditions are satisfied under each of the following throttle conditions. ― ATF temperature 20 °C {68 °F} or more ― Driving in 4GR at D or M range ― Engine running ― Turbine speed within 225—4,987 rpm ― Vehicle speed 70 km/h {43 mph} or less ― Torque converter clutch (TCC) not operating ― Difference between engine speed and turbine speed 50 rpm or less ― DTC P0734 not output • Accelerator pedal conditions. ― 5 s or more have elapsed with accelerator pedal opening angle fully-closed ― 3 s or more have elapsed with accelerator pedal opening angle of 3.13—6.25% ― 5 s or more have elapsed with accelerator pedal opening angle of 6.25% or more Diagnostic support note: • This is a continuous monitor (CCM). • The MIL does not illuminate if TCM detects the above malfunction conditions during first the drive cycle. • A PENDING CODE is not available. • FREEZE FRAME DATA is not available. • The AT warning light illuminates. • The DTC is stored in the TCM memory.
POSSIBLE CAUSE	• ATF level low • Deteriorated ATF • Shift solenoids A, B, C, D, E, and pressure control solenoid A stuck • Line pressure low • 2-4 brake band slipping • 3-4 clutch slipping • Control valve stuck • TCM malfunction

DTC P0742

Torque converter clutch (TCC) stuck on

DETECTION CONDITION

• All of the following conditions are satisfied under each of the following throttle conditions.

― ATF temperature 20 °C {68 °F} or more

― Driving in 4GR at D or M range

― Engine running

― Turbine speed within 225—4,987 rpm

― Vehicle speed 70 km/h {43 mph} or less

― Torque converter clutch (TCC) not operating

― Difference between engine speed and turbine speed 50 rpm or less

― DTC P0734 not output

• Accelerator pedal conditions.

― 5 s or more have elapsed with accelerator pedal opening angle fully-closed

― 3 s or more have elapsed with accelerator pedal opening angle of 3.13—6.25%

― 5 s or more have elapsed with accelerator pedal opening angle of 6.25% or more

Diagnostic support note:

• This is a continuous monitor (CCM).

• The MIL does not illuminate if TCM detects the above malfunction conditions during first the drive cycle.

• A PENDING CODE is not available.

• FREEZE FRAME DATA is not available.

• The AT warning light illuminates.

• The DTC is stored in the TCM memory.

POSSIBLE CAUSE

• ATF level low

• Deteriorated ATF

• Shift solenoids A, B, C, D, E, and pressure control solenoid A stuck

• Line pressure low

• 2-4 brake band slipping

• 3-4 clutch slipping

• Control valve stuck

• TCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
2	INSPECT ATF CONDITION • Turn the ignition switch to the LOCK position. • Inspect the ATF condition. ― Clear red: Normal ― Milky: Water mixed in fluid ― Reddish brown: Deteriorated ATF • Is it normal? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)	Yes	Go to the next step.
No	If the ATF color is milky or reddish brown, replace ATF, then go to Step 4. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FS5A-EL].)
3	INSPECT ATF LEVEL • Start the engine. • Warm up the ATX. • Is the ATF level within the specification? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)	Yes	Go to the next step.
No	Add ATF to the specified level, then go to Step 6. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)
4	INSPECT LINE PRESSURE • Start the engine. • Measure the line pressures. (See MECHANICAL SYSTEM TEST [FS5A-EL].) • Are the line pressures within the specifications?	Yes	Go to the next step.
No	• All ranges: Replace the oil pump or control valve body, then go to Step 6. • Any ranges: Replace the automatic transaxle, then go to Step 6. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)
5	INSPECT OPERATION OF EACH VALVE AND EACH SPRING • Turn the ignition switch to the LOCK position. • Remove the primary control valve body. • Disassemble the primary control valve body. • Is each valve operation normal and is the return spring normal? (See PRIMARY CONTROL VALVE BODY REMOVAL [FS5A-EL].) (See PRIMARY CONTROL VALVE BODY INSTALLATION [FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)	Yes	Replace the automatic transaxle, then go to the next step. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)
No	Repair or replace the shift valve and return spring, then go to the next step. (See PRIMARY CONTROL VALVE BODY REMOVAL [FS5A-EL].) (See PRIMARY CONTROL VALVE BODY INSTALLATION [FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)
6	VERIFY TROUBLESHOOTING OF DTC P0742 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from memory using WDS or equivalent. • Start engine. • Warm up the engine until the TCM PID TFT is 20 °C or more. Note • Verify the accelerator pedal opening angle referring to the PCM PID APP. • Display the PCM PID APP. • Drive the vehicle according to the accelerator opening angle driving conditions under the following conditions. ― D position ― 4th gear fixed ― Vehicle speed 70km/h or less • Accelerator pedal conditions. ― 5 s or more have elapsed with accelerator pedal opening angle fully-closed ― 3 s or more have elapsed with accelerator pedal opening angle of 3.13—6.25% ― 5 s or more have elapsed with accelerator pedal opening angle of 6.25% or more • Are any DTCs present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [FS5A-EL].)
No	Go to the next step.
7	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [FS5A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection.
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT ATF CONDITION

• Turn the ignition switch to the LOCK position.

• Inspect the ATF condition.

― Clear red: Normal

― Milky: Water mixed in fluid

― Reddish brown: Deteriorated ATF

• Is it normal?

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)

Yes

Go to the next step.

If the ATF color is milky or reddish brown, replace ATF, then go to Step 4.

(See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FS5A-EL].)

INSPECT ATF LEVEL

• Start the engine.

• Warm up the ATX.

• Is the ATF level within the specification?

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)

Yes

Go to the next step.

Add ATF to the specified level, then go to Step 6.

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)

INSPECT LINE PRESSURE

• Start the engine.

• Measure the line pressures.

(See MECHANICAL SYSTEM TEST [FS5A-EL].)

• Are the line pressures within the specifications?

Yes

Go to the next step.

• All ranges: Replace the oil pump or control valve body, then go to Step 6.

• Any ranges: Replace the automatic transaxle, then go to Step 6.

(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

INSPECT OPERATION OF EACH VALVE AND EACH SPRING

• Turn the ignition switch to the LOCK position.

• Remove the primary control valve body.

• Disassemble the primary control valve body.

• Is each valve operation normal and is the return spring normal?

(See PRIMARY CONTROL VALVE BODY REMOVAL [FS5A-EL].)

(See PRIMARY CONTROL VALVE BODY INSTALLATION [FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

Yes

Replace the automatic transaxle, then go to the next step.

(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

Repair or replace the shift valve and return spring, then go to the next step.

(See PRIMARY CONTROL VALVE BODY REMOVAL [FS5A-EL].)

(See PRIMARY CONTROL VALVE BODY INSTALLATION [FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

VERIFY TROUBLESHOOTING OF DTC P0742 COMPLETED

• Make sure to reconnect all disconnected connectors.

• Clear DTC from memory using WDS or equivalent.

• Start engine.

• Warm up the engine until the TCM PID TFT is 20 °C or more.

Note

• Verify the accelerator pedal opening angle referring to the PCM PID APP.

• Display the PCM PID APP.

• Drive the vehicle according to the accelerator opening angle driving conditions under the following conditions.

― D position

― 4th gear fixed

― Vehicle speed 70km/h or less

• Accelerator pedal conditions.

― 5 s or more have elapsed with accelerator pedal opening angle fully-closed

― 3 s or more have elapsed with accelerator pedal opening angle of 3.13—6.25%

― 5 s or more have elapsed with accelerator pedal opening angle of 6.25% or more

• Are any DTCs present?

Yes

Replace the TCM, then go to the next step.

(See TCM REMOVAL/INSTALLATION [FS5A-EL].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See AFTER REPAIR PROCEDURE [FS5A-EL].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

DTC troubleshooting completed.