DTC P0740, P0741, P0742, P0743, P0744, P1744 [5R55S]

id0502c1834900

DTC P0740

Torque converter clutch (TCC) control solenoid circuit malfunction (open circuit)

DTC P0741

Torque converter clutch (TCC) control solenoid circuit malfunction (stuck off)

DTC P0742

Torque converter clutch (TCC) control solenoid circuit malfunction (stuck on)

DTC P0743

Torque converter clutch (TCC) control solenoid circuit malfunction (open or short circuit)

DTC P0744

Torque converter clutch (TCC) control solenoid circuit malfunction (short to power)

DTC P1744

Torque converter clutch (TCC) control solenoid circuit malfunction (inoperative)

DETECTION CONDITION

•  P0740: Open circuit in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit.

•  P0741: Torque converter clutch slipping indicating a mechanical or hydraulic concern.

•  P0742: Short to ground in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit.

•  P0743: Open or short circuit in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit.

•  P0744: Short to power supply in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit.

•  P1744: Mechanical failure of TCC control solenoid.

POSSIBLE CAUSE

•  TCC control solenoid malfunction.

•  Short to ground in wiring harness between AT connector terminal I (wiring harness-side) and TCM terminal CK (wiring harness-side).

•  Short to ground in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side).

•  Short to power supply in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side).

•  Open circuit in wiring harness between AT connector terminal I (wiring harness-side) and TCM terminal CK (wiring harness-side).

•  Open circuit in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side).

•  Damaged connector between AT connector and TCM.

•  TCM malfunction.

DTC P0740	Torque converter clutch (TCC) control solenoid circuit malfunction (open circuit)
DETECTION CONDITION	• P0740: Open circuit in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P0741: Torque converter clutch slipping indicating a mechanical or hydraulic concern. • P0742: Short to ground in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P0743: Open or short circuit in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P0744: Short to power supply in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P1744: Mechanical failure of TCC control solenoid.
POSSIBLE CAUSE	• TCC control solenoid malfunction. • Short to ground in wiring harness between AT connector terminal I (wiring harness-side) and TCM terminal CK (wiring harness-side). • Short to ground in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side). • Short to power supply in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side). • Open circuit in wiring harness between AT connector terminal I (wiring harness-side) and TCM terminal CK (wiring harness-side). • Open circuit in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side). • Damaged connector between AT connector and TCM. • TCM malfunction.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	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.
2		No	Go to the next step.
3	INSPECT AT CONNECTOR FOR POOR CONNECTION • Turn the engine switch to the LOCK position. • Inspect the AT connector connection. • Disconnect the AT connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is the connection normal?	Yes	Go to the next step.
3		No	Repair or replace the connector and/or terminals, then go to Step 10.
4	INSPECT POWER SUPPLY CIRCUIT • Turn the engine switch to the ON position (engine off). • Inspect voltage at AT connector terminal I (wiring harness-side). • Is the voltage approx. 12 V?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT RESISTANCE • Turn the engine switch to the LOCK position. • Inspect resistance between AT terminal I and H (transmission case side). • Is resistance within 9—16 ohms? (See SOLENOID VALVE INSPECTION [5R55S].)	Yes	Go to the next step.
5		No	Replace the TCC control solenoid, then go to Step 10.
6	INSPECT TCM CONNECTOR FOR POOR CONNECTION • Disconnect the TCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is the connection normal?	Yes	Go to the next step.
6		No	Repair or replace connector and/or terminals, then go to Step 10.
7	INSPECT TCC CONTROL SOLENOID CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the TCM terminal (wiring harness-side) and the AT connector terminal (wiring harness-side). ― CK and I ― A and H • Is there continuity between terminals?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness, then go to Step 10.
8	INSPECT TCC CONTROL SOLENOID CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between AT connector terminal (wiring harness-side) and body ground. ― I and body ground ― H and body ground • Is there continuity?	Yes	Repair or replace the wiring harness, then go to the Step 10.
8		No	Go to the next step.
9	INSPECT TCC CONTROL SOLENOID CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the engine switch to the ON position (engine off). • Inspect voltage at AT connector terminal H (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0740, P0741, P0742, P0743, P0744 OR P1744 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from memory using the IDS/PDS. • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [5R55S].) • Are any DTCs present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [5R55S].)
10		No	Go to the next step.
11	VERIFY DTCS • Are DTCs except for P0740, P0741, P0742, P0743, P0744 and P1744 output?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [5R55S].)
11		No	DTC troubleshooting completed.

DTC P0740	Torque converter clutch (TCC) control solenoid circuit malfunction (open circuit)
DTC P0741	Torque converter clutch (TCC) control solenoid circuit malfunction (stuck off)
DTC P0742	Torque converter clutch (TCC) control solenoid circuit malfunction (stuck on)
DTC P0743	Torque converter clutch (TCC) control solenoid circuit malfunction (open or short circuit)
DTC P0744	Torque converter clutch (TCC) control solenoid circuit malfunction (short to power)
DTC P1744	Torque converter clutch (TCC) control solenoid circuit malfunction (inoperative)
DETECTION CONDITION	• P0740: Open circuit in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P0741: Torque converter clutch slipping indicating a mechanical or hydraulic concern. • P0742: Short to ground in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P0743: Open or short circuit in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P0744: Short to power supply in circuit between TCC control solenoid and TCM, or in TCC control solenoid internal circuit. • P1744: Mechanical failure of TCC control solenoid.
POSSIBLE CAUSE	• TCC control solenoid malfunction. • Short to ground in wiring harness between AT connector terminal I (wiring harness-side) and TCM terminal CK (wiring harness-side). • Short to ground in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side). • Short to power supply in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side). • Open circuit in wiring harness between AT connector terminal I (wiring harness-side) and TCM terminal CK (wiring harness-side). • Open circuit in wiring harness between AT connector terminal H (wiring harness-side) and TCM terminal A (wiring harness-side). • Damaged connector between AT connector and TCM. • TCM malfunction.