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Home >> Subaru >> 2017 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle (Diagnostics) >> Automatic transmission system >> DTC P2762, P2763, P2764: Torque Converter Clutch Pressure Control Solenoid Control Circuit Range/Performance, Torque Converter Clutch Pressure Control Solenoid Control Circuit High, Torque Converter Clutch Pressure Control Solenoid Control Circuit Low >> Notes
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DTC P2762, P2763, P2764: Torque Converter Clutch Pressure Control Solenoid Control Circuit Range/Performance, Torque Converter Clutch Pressure Control Solenoid Control Circuit High, Torque Converter Clutch Pressure Control Solenoid Control Circuit Low: 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
  1. Diagnosis condition
  2. Abnormal status
  3. Abnormal period
  4. Others
 Inspection parts
P2762
  1. Learning control is not prohibited.

    Lock-up solenoid system circuit (Low/High) is not malfunctioning.

  2. The cumulative difference between lock-up control solenoid (SLU) operation set current and operation feedback current is 12 A or more.
  3. Abnormal status of No. 2 is detected 2 times consecutively.
  4. trips
  • Lock-up control solenoid (SLU)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
P2763
  1. Learning control is not prohibited.

    Lock-up solenoid system circuit (performance) is not malfunctioning.

  2. SLU operation feedback voltage is 0.257 V or more after lock-up control solenoid (SLU) is turned OFF and 1 second or more has passed.
  3. 100 ms or more durations are detected 5 times consecutively.
  4. trips
  • Lock-up control solenoid (SLU)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
P2764
  1. Learning control is not prohibited.

    Lock-up solenoid system circuit (performance) is not malfunctioning.

  2. SLU operation feedback voltage is less than 0.018 V after lockup control solenoid (SLU) is turned ON and 1 second or more has passed.
  3. 100 ms or more durations are detected 5 times consecutively.
  4. trips
  • Lock-up control solenoid (SLU)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY

Monitor description

If open or short circuit is detected in the lock-up control solenoid ASSY (SLU) circuit, TCM recognizes it as a defect. TCM turns on MIL and records the diagnostic code.

MONITOR STRATEGY DESCRIPTION

Applicable diagnostic codes P2762: Torque Converter Clutch Pressure Control Solenoid Control Circuit Range/Performance
P2763: Torque Converter Clutch Pressure Control Solenoid Control Circuit High
P2764: Torque Converter Clutch Pressure Control Solenoid Control Circuit Low
Required sensor/component Lock-up control solenoid ASSY (SLU)
Operation frequency Consecutive
Period P2762: 2 count
P2763: 0.1 seconds x 5 times
P2764: 0.1 seconds x 5 times
MIL operation Immediate
Operation order None

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS DESCRIPTION

Battery voltage 10.2 V or more
Above condition is established 2 seconds or more
Fail safe mode (solenoid power supply shut down) Non-active
Lock-up control solenoid (SLU) (P2764, P2763) No defect
Check the feedback terminal voltage. 0.257V or less
Battery voltage 10.5V or more
Above condition (battery voltage) is established 0.5 seconds or more
TYPICAL ENABLING CONDITIONS DESCRIPTION

Battery voltage 10.2 V or more
Above condition is established 2 seconds or more
Fail safe mode (solenoid power supply shut down) Non-active
Lock-up control solenoid (SLU) (P2762) No defect
TYPICAL ENABLING CONDITIONS DESCRIPTION

Battery voltage 10.2 V or more
Above condition is established 2 seconds or more
Fail safe mode (solenoid power supply shut down) Non-active
Lock-up control solenoid (SLU) (P2762) No defect

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS DESCRIPTION

Cumulative total of differences between target current and feedback current (Sum_ie) 12 A or more
Sum_ie is updated every 25 milliseconds.
When 1 or more conditions below are established, Sum_ie is deleted.
  1. The permission condition is not established.
  2. When the current difference (ie) between target and feedback is -50 mA to 50 mA
  3. Positive and negative of ie are reversed.
TYPICAL MALFUNCTION THRESHOLDS DESCRIPTION

Check the feedback terminal voltage. 0.257V or more
Time elapsed after recovery from battery short circuit 1 second or more
TYPICAL MALFUNCTION THRESHOLDS DESCRIPTION

Check the feedback terminal voltage. 0.018 V or less
Time elapsed after recovery from short circuit to ground/open circuit 1 second or more
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