DTC P2757, P2758: Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off, Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On: Notes
Circuit description
The lock-up control solenoid (SLU) is controlled by the duty signal which is predetermined by the transmission control computer ASSY. Then, lock-up and flex lock-up control is performed.
| DTC No. SAE/TCCS | DTC detecting condition
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Inspection parts |
|---|---|---|
| P2757 |
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| P2758 |
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Monitor description
The torque converter lock-up is controlled by TCM based on the transmission revolution sensor (NT, SP2), engine r/min, engine load, engine temperature, vehicle speed, transmission temperature, and selected gear. TCM compares engine r/min (NE) with input turbine r/min (NT) to determine the lock-up status of the torque converter. TCM compares input turbine r/min (NT) and output shaft r/min (SP2) to calculate the actual transmission gear. If the condition is appropriate, TCM applies control voltage to the lock-up control solenoid (SLU) and requires "lock up". When the lock-up control solenoid (SLU) turns to ON, it applies pressure to the lock up relay valve to lock the torque converter clutch.
If TCM does not detect lock up after the lock up is requested or detects lock up even though it is not requested, TCM recognizes it as a malfunction of the lock-up control solenoid (SLU) or lock up system performance. TCM turns on MIL and records the diagnostic codes.
| Applicable diagnostic codes | P2757: Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off P2758: Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On |
| Required sensor/component | Lock-up control solenoid ASSY (SLU) |
| Operation frequency | Consecutive |
| Period | P2757: 2 seconds P2758: 1.8 seconds, 2 counts (detecting defects after the vehicle speed becomes less than 10 km/h {6 MPH} after 1 count) |
| MIL operation | 2nd driving cycle |
| Operation order | None |
TYPICAL ENABLING CONDITIONS
| Battery voltage | 10.5V or more |
| Engine speed | 400 r/min or more |
| Fail safe mode (solenoid power supply shut down) | Non-active |
| Transmission revolution sensor (NT) (P0717) | No defect |
| Transmission revolution sensor (SP2) (P0722) | No defect |
| Transmission 3 way solenoid ASSY (S1) (P0973, P0974) | No defect |
| Transmission 3 way solenoid ASSY (S2) (P0976, P0977) | No defect |
| Transmission 3 way solenoid ASSY (S3) (P0979, P0980) | No defect |
| Transmission 3 way solenoid ASSY (S4) (P0982, P0983) | No defect |
| Transmission 3 way solenoid ASSY (SR) (P0985, P0986) | No defect |
| Clutch control solenoid No. 1 (SL1) (P0962, P0963, P0961) | No defect |
| Clutch control solenoid No. 1 (SL2) (P0966, P0967, P0965) | No defect |
| Line pressure control solenoid ASSY (SLT) (P2720, P2721, P2719) | No defect |
| Lock-up control solenoid (SLU) (P2762, P2763, P2764) | No defect |
| Neutral start switch ASSY (P0707, P0708) | No defect |
| Oil temperature sensor (P0711, P0712, P0713) | No defect |
| CAN bus OFF (U0073) | No defect |
| ECM without ID (U0100) | No defect |
| ECM communication counter (U0401) | No defect |
| Coolant temperature sensor | No defect |
| Engine torque signal | No defect |
| Throttle opening angle sensor | No defect |
| Accelerator pedal opening angle sensor | No defect |
| Range position | D |
| Time elapsed after D range selection | 4 seconds or more |
| Engine coolant temperature | 40°C or more |
| Target gear position | 4th, 5th, 6th |
| ATF temperature | 20°C or more |
TYPICAL MALFUNCTION THRESHOLDS
| Lock-up control solenoid indication | 513 kPa {5.2 kgf/cm2 , 74.4 psi} or more |
| Above condition is established | 3 seconds or more |
| Engine speed - turbine shaft speed | 70 r/min or more |
| Gear ratio calculated from turbine shaft speed and vehicle speed | 4th, 5th, 6th |
| Throttle opening angle | Refer to MAP A |
| Vehicle speed | 22 km/h {14 MPH} or more |
| Turbine shaft speed (r/min) | 1200 | 1500 | 3500 | 5100 | 5200 |
| Throttle (%) | 12.9 | 13.4 | 26 | 39.6 | 100 |
| Lock-up control solenoid indication | 4 kPa {0.04 kgf/cm2 , 0.58 psi} or less |
| Above condition is established | 3 seconds or more |
| Engine speed - turbine shaft speed | Less than 35 r/min |
| Gear ratio calculated from turbine shaft speed and vehicle speed | 4th, 5th, 6th |
| Throttle opening angle | Refer to MAP B |
| Vehicle speed | 22 km/h {14 MPH} or more |
| Turbine shaft speed (r/min) | 1200 | 1500 | 2000 | 5800 | 5900 |
| Throttle (%) | 8.1 | 8.2 | 10 | 40 | 100 |