DTC P0742 [EXCEPT FOR GENERAL (L.H.D.) SPECS. SPORT AT (FN4A-EL)]

id0502a18080a6

DTC P0742

Torque converter clutch (TCC) stuck ON

DETECTION CONDITION

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

―  ATF temperature 20 °C {68 °F} or above.

―  Driving in 4GR at D range.

―  Engine run.

―  Turbine speed within 225—4,988 rpm.

―  Vehicle speed below 70 km/h {43 mph}.

―  Torque converter clutch (TCC) no operation

―  Difference between engine speed and turbine speed below 50 rpm

―  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—10%

―  5 s or more have elapsed with accelerator pedal opening angle of 10% or more

Diagnostic support note:

•  This is a continuous monitor (CCM).

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

•  PENDING CODE is not available.

•  FREEZE FRAME DATA is not available.

•  HOLD indicator light flashes.

•  DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  ATF level low

•  Deteriorated ATF

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

•  Line pressure low

•  2-4 brake band slipping

•  3-4 clutch slipping

•  Control valve stuck

•  PCM malfunction

DTC P0742	Torque converter clutch (TCC) stuck ON
DETECTION CONDITION	• All of following conditions satisfied under each of following throttle conditions. ― ATF temperature 20 °C {68 °F} or above. ― Driving in 4GR at D range. ― Engine run. ― Turbine speed within 225—4,988 rpm. ― Vehicle speed below 70 km/h {43 mph}. ― Torque converter clutch (TCC) no operation ― Difference between engine speed and turbine speed below 50 rpm ― 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—10% ― 5 s or more have elapsed with accelerator pedal opening angle of 10% or more Diagnostic support note: • This is a continuous monitor (CCM). • MIL does not illuminate if PCM detects the above malfunction conditions during first drive cycle. • PENDING CODE is not available. • FREEZE FRAME DATA is not available. • HOLD indicator light flashes. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• ATF level low • Deteriorated ATF • Shift solenoids A, B, C, D, E, and pressure control solenoid stuck • Line pressure low • 2-4 brake band slipping • 3-4 clutch slipping • Control valve stuck • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Check for related Service Bulletins availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to available repair information. • If vehicle is not repaired, go to next step.
1		No	Go to next step.
2	CHECK ATF CONDITION • Turn ignition key to OFF. • Check ATF condition. ― Clear red: Normal ― Milky: Water mixed in fluid ― Reddish brown: Deteriorated ATF • Is it okay? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].)	Yes	Go to next step.
2		No	If ATF color milky or reddish brown, replace ATF, then go to Step 4. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL].)
3	CHECK ATF LEVEL • Start engine. • Warm up ATX. • Is ATF level within specification? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].)	Yes	Go to next step.
3		No	Adjust ATF level, then go to Step 6. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].)
4	INSPECT LINE PRESSURE • Start engine. • Measure line pressure. Specification Idle: 330—470 kPa {3.4—4.7 kgf/cm², 49—66 psi} Stall: 1,160—1,320 kPa {11.9—13.4 kgf/cm², 170—190 psi} • Is line pressure within specification? (See MECHANICAL SYSTEM TEST [FN4A-EL].)	Yes	Go to next step.
4		No	• All ranges: Replace oil pump or control valve body, then go to Step 6. • Any ranges: Replace ATX, then go to Step 6. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)
5	CHECK OPERATION OF EACH VALVE AND EACH SPRING • Turn ignition key to OFF. • Remove control valve body. • Disassemble control valve body. • Is each valve operation okay and is return spring okay? (See CONTROL VALVE BODY REMOVAL [FN4A-EL], CONTROL VALVE BODY INSTALLATION [FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)	Yes	Replace ATX, then go to next step. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)
5		No	Repair or replace shift valve and return spring, then go to next step. (See CONTROL VALVE BODY REMOVAL [FN4A-EL], CONTROL VALVE BODY INSTALLATION [FN4A-EL].) (See ATX Workshop Manual FN4A-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—10% ― 5 s or more have elapsed with accelerator pedal opening angle of 10% or more • Are any DTCs present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [LF, L3].)
6		No	Go to next step.
7	VERIFY AFTER REPAIR PROCEDURE • Perform “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [FN4A-EL].) • Are any DTCs present?	Yes	Go to applicable DTC inspection.
7		No	Troubleshooting completed.