DTC P0742 [FS5A-EL]

id050221808000

DTC P0742 | Torque converter clutch (TCC) stuck on
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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

Diagnostic procedure

STEP | INSPECTION | ACTION
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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.