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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Automatic Transmission System (Aa80E) - Diagnostic Codes (1 Of 2)) >> Automatic Transmission System >> DTC P0746: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) [11/2021 - ] >> Description

DTC P0746: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) [11/2021 - ]: Description

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The TCM detects the actual gear based on signals from the transmission revolution sensors (SP2, NC3 and NT).

Based on the detected gear and oil pressure switch output, 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 SL1:

TCM commanded gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear during SL1 stuck ON malfunction 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear during SL1 stuck OFF malfunction N*1 N*1 N*1 N*1 N*1 6th 7th 8th
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0746 Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) 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), oil pressure switch, water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)
  2. When gear shifts to 6th, 7th, and 8th are requested by the TCM, the oil pressure switch is ON
  3. Malfunction status is detected 2 times per 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), oil pressure switch, water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)
  2. When gear shifts to 1st to 5th are requested by the TCM, the engine speed overruns (neutral status)
  3. Malfunction status continues for 0.5 sec. or more
  4. 2-trip detection logic
 DTC Detection Condition 1:
  • Shift solenoid valve SL1
  • Oil pressure switch
  • Valve body assembly
  • Automatic transmission assembly

DTC Detection Condition 2:
  • Shift solenoid valve SL1
  • Shift solenoid valve SLT
  • Valve body assembly
  • Automatic transmission assembly
 Comes on DTC stored
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