DTC P0742[FN4A-EL]

id0502a1808000

DTC P0742

Torque converter clutch (TCC) stuck on

DETECTION CONDITION

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

―  Engine running

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

―  Driving in 4GR at D or M range

―  Turbine speed within 225—4,987 rpm

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

―  Torque converter clutch (TCC) no operating

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

―  DTC P0734 not output

―  Accelerator conditions (ZY)

•  Accelerator opening angle (APP PID) is 10.1% or more and 5 s or more have passed.

•  Accelerator opening angle (APP PID) is within 3.13—10.1% and 3 s or more have passed.

•  Accelerator opening angle is at closed accelerator position and 5 s or more have passed.

―  Throttle conditions (Z6)

•  Throttle opening angle (THOP PID) is 10.1% or more and 5 s or more have passed.

•  Throttle opening angle (THOP PID) is within 3.13—10.1% and 3 s or more have passed.

•  Throttle opening angle is at closed throttle position and 5 s or more have passed.

―  Accelerator conditions (LF)

•  Accelerator opening angle (APP PID) is 6.25% or more and 5 s or more have passed.

•  Accelerator opening angle (APP PID) is within 3.13—6.25% and 3 s or more have passed.

•  Accelerator opening angle is at closed accelerator position and 5 s or more have passed.

Diagnostic support note:

•  This is a continuous monitor (CCM).

•  The MIL does not illuminate if PCM 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 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 the following conditions are satisfied under each of the following throttle conditions. ― Engine running ― ATF temperature 20 °C {68 °F} or more ― Driving in 4GR at D or M range ― Turbine speed within 225—4,987 rpm ― Vehicle speed 70 km/h {43 mph} or less ― Torque converter clutch (TCC) no operating ― Difference between engine speed and turbine speed 50 rpm or less ― DTC P0734 not output ― Accelerator conditions (ZY) • Accelerator opening angle (APP PID) is 10.1% or more and 5 s or more have passed. • Accelerator opening angle (APP PID) is within 3.13—10.1% and 3 s or more have passed. • Accelerator opening angle is at closed accelerator position and 5 s or more have passed. ― Throttle conditions (Z6) • Throttle opening angle (THOP PID) is 10.1% or more and 5 s or more have passed. • Throttle opening angle (THOP PID) is within 3.13—10.1% and 3 s or more have passed. • Throttle opening angle is at closed throttle position and 5 s or more have passed. ― Accelerator conditions (LF) • Accelerator opening angle (APP PID) is 6.25% or more and 5 s or more have passed. • Accelerator opening angle (APP PID) is within 3.13—6.25% and 3 s or more have passed. • Accelerator opening angle is at closed accelerator position and 5 s or more have passed. Diagnostic support note: • This is a continuous monitor (CCM). • The MIL does not illuminate if PCM 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 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 SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		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[FN4A-EL].)	Yes	Go to the next step.
2		No	If the ATF color is milky or reddish brown, replace ATF, then go to Step 4. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT[FN4A-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[FN4A-EL].)	Yes	Go to the next step.
3		No	Add ATF to the specified level, then go to Step 6. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FN4A-EL].)
4	INSPECT LINE PRESSURE • Start the engine. • Measure the line pressures. (See MECHANICAL SYSTEM TEST[FN4A-EL].) • Are the line pressures within the specifications?	Yes	Go to the next step.
4		No	• All ranges: Replace the oil pump or control valve body, then go to Step 6. • Any ranges: Replace the ATX, then go to Step 6. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION (ZY, Z6)[FN4A-EL].) (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION (LF)[FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)
5	INSPECT OPERATION OF EACH VALVE AND EACH SPRING • Turn the ignition switch to the LOCK position. • Remove the control valve body. • Disassemble the control valve body. • Is each valve operation normal and is the return spring normal? (See CONTROL VALVE BODY REMOVAL[FN4A-EL].) (See CONTROL VALVE BODY INSTALLATION[FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)	Yes	Replace the ATX, then go to the next step. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION (ZY, Z6)[FN4A-EL].) (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION (LF)[FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)
5		No	Repair or replace the shift valve and return spring, then go to the next step. (See CONTROL VALVE BODY REMOVAL[FN4A-EL].) (See CONTROL VALVE BODY INSTALLATION[FN4A-EL].) (See ATX Workshop Manual FN4A-EL.)
6	VERIFY TROUBLESHOOTING OF DTC P0742 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the memory using the M-MDS. • Start the engine. • Warm up engine and ATX. • Drive the vehicle under the following conditions: ― ATF temperature: 20 °C {68 °F} or more ― Drive in the D range, 4GR (TCC not in operation) ― Vehicle speed: 70 km/h {43 mph} or less. • Accelerator conditions (ZY) ― Accelerator opening angle (APP PID) is 10.1% or more and 5 s or more have passed. ― Accelerator opening angle (APP PID) is within 3.13—10.1% and 3 s or more have passed. ― Accelerator opening angle is at closed accelerator position and 5 s or more have passed. • Throttle conditions (Z6) ― Throttle opening angle (THOP PID) 10.1% or more and 5 s or more have passed. ― Throttle opening angle (THOP PID) within 3.13—10.1% and 3 s or more have passed. ― Throttle opening angle at closed throttle position and 5 s or more have passed. • Accelerator conditions (LF) ― Accelerator opening angle (APP PID) is 6.25% or more and 5 s or more have passed. ― Accelerator opening angle (APP PID) is within 3.13—6.25% and 3 s or more have passed. ― Accelerator opening angle is at closed accelerator position and 5 s or more have passed. • Are any DTCs present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION[ZJ, ZY, Z6].) (See PCM REMOVAL/INSTALLATION[LF, L3].)
6		No	Go to the next step.
7	VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE[FN4A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE[FN4A-EL].)
7		No	DTC troubleshooting completed.