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DTC P0740 [JA5AX-EL]

id050206812100

DTC P0740 | TCC system malfunction
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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
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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? (See Automatic Transaxle Fluid (ATF) Condition Inspection.) | Yes | Go to next step.
No | If ATF color milky or reddish brown, replace ATF, then go to Step 5. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [JA5AX-EL].)
4 | CHECK ATF LEVEL • Start engine. • Warm up ATX. • Is ATF level within specification? (See Automatic Transaxle Fluid (ATF) Level Inspection.) | Yes | Go to next step.
No | Adjust ATF level, then go to Step 9. (See Automatic Transaxle Fluid (ATF) Level Inspection.)
5 | INSPECT LINE PRESSURE • Start engine. • Measure line pressure. Specification - D range, M (2GR) range Idle: 290-490 kPa {3.0-4.9 kgf/cm 2, 43-69 psi} Stall: 1,550-1,750 kPa {15.8-17.8 kgf/cm 2, 225-254 psi} - M (1GR) range, R position Idle:550-750 kPa {5.6-7.6 kgf/cm 2, 80-109 psi} Stall: 1,550-1,750 kPa {15.8-17.8 kgf/cm 2, 225-254 psi} • Is line pressure within specification? (See Line Pressure Test.) | 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. (See AUTOMATIC TRANSAXLE AND TRANSFER REMOVAL/INSTALLATION [JA5AX-EL].)
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. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [JA5AX-EL].)
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. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [JA5AX-EL].)
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. (See TCM REMOVAL/INSTALLATION [JA5AX-EL].)
No | Go to next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [JA5AX-EL].) • Is there any DTC present? | Yes | Go to applicable DTC inspection.
No | Troubleshooting completed.