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 DTC P0740 [JA5AX-EL]

DTC P0740 [JA5AX-EL]

id050206812100

DTC P0740

TCC system malfunction

DETECTION CONDITION

• RPM difference between crankshaft (engine speed signal) and reverse clutch drum (input/turbine speed sensor signal) exceeds the pre-programmed value.
Diagnostic support note:
• This is continuous monitor (CCM).
• MIL illuminates if TCM detects the above malfunction conditions in two consecutive drive cycles.
• PENDING CODE is available.
• FREEZE FRAME DATA is available.
• AT warning light does not indication.
• DTC is stored in TCM memory.

POSSIBLE CAUSE

• ATF level low.
• Deteriorated ATF.
• TCC solenoid valve and pressure control solenoid stuck.
• Line pressure low.
• Oil pump malfunction.
• Control valve stuck
• Torque convert clutch malfunction
• TCM malfunction.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME PID DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME PID DATA on repair order, then go to next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Bulletins and/or on-line repair information 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.
3
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 5.
4
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 9.
5
INSPECT LINE PRESSURE
• Start engine.
• Measure line pressure.

Specification

- D range, M (2GR) range
Idle: 290-490 kPa {3.0-4.9 kgf/cm2, 43-69 psi}
Stall: 1,550-1,750 kPa {15.8-17.8 kgf/cm2, 225-254 psi}
- M (1GR) range, R position
Idle:550-750 kPa {5.6-7.6 kgf/cm2, 80-109 psi}
Stall: 1,550-1,750 kPa {15.8-17.8 kgf/cm2, 225-254 psi}
• Is line pressure within specification?
Yes
Go to next step.
No
All ranges: Replace or overhaul oil pump or control valve body, then go to Step 10.
Any ranges: Replace or overhaul automatic transaxle, then go to Step 10.
6
CLICK TEST OF SOLENOID VALVES
• Turn ignition key to OFF.
• Disconnect terminal component No.1(12-pin).
• Apply battery voltage to terminal component No.1 (12-pin) terminals (transaxle case side).
- TCC solenoid vale: B
- Pressure control solenoid: D
• Verify the click sounds of TCC solenoid valve and pressure control solenoid.
• Are there click sounds?
Yes
Go to next step.
No
Replace TCC solenoid valve or pressure control solenoid, then go to Step 10.
7
INSPECT DIFFERENCE BETWEEN ENGINE SPEED AND TURBINE SPEED
• Inspect difference between engine speed and turbine speed during TCC operation in 5GR
• Drive vehicle under following condition
- TR switch position: D range
- Gear position: 5GR
- TCC solenoid valve: ON
• Is difference between engine speed (RPM PID) and turbine speed okay?
Difference

Below 99 rpm

Yes
Go to Step
No
Go to next step.
8
INSPECT OPERATION OF EACH VALVE AND EACH SPRING
• Remove control valve body.
• Disassemble control valve body.
• Is each valve operation okay and is return spring okay?
Yes
Replace torque converter, then go to next step.
No
Replace control valve body, then go to next step.
9
VERIFY TROUBLESHOOTING OF DTC P0740 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Start engine.
• Warm up ATX.
• Drive vehicle under following condition for 10 s or more.
- Vehicle speed (VSS PID): Within 10-87 km/h {6-54 mph}
- Gear position: 5GR
- TR switch position: D range
- TCC solenoid valve: ON
• Is there pending code present?
Yes
Replace TCM, then go to next step.
No
Go to next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.