DTC P0742[FS5A-EL]

id050221808000

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
―  Throttle conditions
•  Throttle opening angle (THOP PID) is 6.25% or more and 5 s or more have passed.
•  Throttle opening angle (THOP PID) is within 3.13—6.25% and 3 s or more have passed.
•  Throttle opening angle is at closed throttle position and 5 s or more have passed.
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
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?
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?
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.
•  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 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 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 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 (TFT PID): 20 °C {68 °F} or more
―  Drive in the D range, 4GR (TCC not in operation)
―  Vehicle speed (VSS PID): 70 km/h {43 mph} or less.
•  Throttle conditions
―  Throttle opening angle (THOP PID) 6.25% or more and 5 s or more have passed.
―  Throttle opening angle (THOP PID) within 3.13—6.25% and 3 s or more have passed.
―  Throttle opening angle at closed throttle position and 5 s or more have passed.
•  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”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.