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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (Automatic Transmission System (Aa80E) - Diagnostic Codes (2 Of 2) & Circuit Tests) >> Automatic Transmission System >> DTC P2808: Pressure Control Solenoid "G" Performance (Shift Solenoid Valve SL4) [11/2021 - ] >> Description

DTC P2808: Pressure Control Solenoid "G" Performance (Shift Solenoid Valve SL4) [11/2021 - ]: Description

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Based on signals from the transmission revolution sensors (NT, SP2 and NC3), the actual gear is detected.

If the detected gear is different than the commanded gear, the TCM detects related mechanical problems in the shift solenoid valves, valve body and automatic transmission.

HINT: 

ACTUAL GEAR WHEN A PROBLEM OCCURS IN SHIFT SOLENOID VALVE SL4:

TCM commanded gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear during SL4 stuck ON malfunction 4th 4th 3rd 4th 6th 6th 7th 6th
Actual gear during SL4 stuck OFF malfunction 1st 2nd 3rd N (1st)* 5th N* 7th 8th

*: Neutral

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2808 Pressure Control Solenoid "G" Performance (Shift Solenoid Valve SL4) 1. Diagnosis Condition, 2. Malfunction Status, 3. Malfunction Time, 4. Other
DTC Detection Condition 1:
  1. Engine coolant temperature is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, transmission revolution sensors (NT, NC3, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)
  2. One of following occurs:

    (a) When gear shifts to 1st are requested by the TCM, actual gear changes to 4th gear

    (b) When gear shifts to 2nd are requested by the TCM, actual gear changes to 4th gear

    (c) When gear shifts to 5th are requested by the TCM, actual gear changes to 6th gear

    (d) When gear shifts to 8th are requested by the TCM, actual gear changes to 6th gear

  3. Malfunction status occurs 2 times (1 trip)
  4. 2-trip detection logic

DTC Detection Condition 2:
  1. Engine coolant temperature is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, transmission revolution sensors (NT, NC3, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)
  2. When gear shifts to 4th or 6th are requested by the TCM, engine speed overruns (neutral status)
  3. Malfunction status continues for 0.5 sec. or more (1 trip)
  4. 2-trip detection logic
 DTC Detection Condition 1:
  • Shift solenoid valve SL4
  • Valve body assembly
  • Torque converter assembly
  • Automatic transmission assembly

DTC Detection Condition 2:
  • Shift solenoid valve SL4
  • Shift solenoid valve SLT
  • Valve body assembly
  • Torque converter assembly
  • Automatic transmission assembly
 Comes on DTC stored
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