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

id0502a18080a7

DTC P0742

Torque converter clutch (TCC) stuck ON

DETECTION CONDITION

• All of following conditions are satisfied under each of following throttle conditions.
- ATF temperature 20 °C {68 °F} or above.
- Driving in 4GR at D range.
- Engine runs.
- 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.
• Throttle conditions.
- Throttle opening angle (TP PID) above 10.1% and 5 seconds or more have passed.
- Throttle opening angle (TP PID) within 3.1-10.1% and 3 seconds or more have passed.
- Throttle opening angle at closed throttle position and 5 seconds or more have passed.
Diagnostic support note:
• This is a continuous monitor (CCM).
• MIL does not illuminate if TCM detects the above malfunction conditions during first drive cycle.
• PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• AT warning light illuminates.
• 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 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

• 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.
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?
Yes
Go to next step.
No
If ATF color milky or reddish brown, replace ATF, then go to Step 4.
3

CHECK ATF LEVEL

• Start engine.
• Warm up ATX.
• Is ATF level within specification?
Yes
Go to next step.
No
Adjust ATF level, then go to Step 6.
4

INSPECT LINE PRESSURE

• Start engine.
• Measure line pressure.

Specification

D, M (1GR, 2GR) range

Idle: 330-470 kPa {3.4-4.8 kgf/cm2,

48-68 psi}

Stall: 1,160-1,320 kPa {11.8-13.5 kgf/cm2, 168-191 psi}

R position

Idle: 490-710 kPa {5.0-7.2 kgf/cm2,

71-102 psi}

Stall: 1,640-1,970 kPa {16.8-20.0 kgf/cm2, 238-285 psi}

• Is line pressure within specification?
Yes
Go to next step.
No
• All ranges: Replace oil pump or control valve body, then go to Step 6.
• Any ranges: Replace ATX, then go to Step 6.
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?
Yes
Replace ATX, then go to next step.
No
Repair or replace shift valve and return spring, then go to next step.
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 engine and ATX.
• Drive vehicle under following.
- ATF temperature: 20 °C {68 °F} or above
- Drive in D range, 4th gear (TCC not in operation).
- Vehicle speed: below 70 km/h {43 mph}.
• Throttle conditions
- Throttle opening angle (TP PID) above 10.1% and 5 seconds or more have passed.
- Throttle opening angle (TP PID) within 3.1-10.1% and 3 seconds or more have passed.
- Throttle opening angle at closed throttle position and 5 seconds or more have passed.
• Are any DTCs present?
Yes
Replace TCM, then go to next step.
No
Go to next step.
7

VERIFY AFTER REPAIR PROCEDURE

• Perform "After Repair Procedure".
• Are any DTCs present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.