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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Automatic Transmission System (Aa81E, For 2GR-FKS) - Diagnostic Codes (3 Of 4)) >> AUTOMATIC TRANSMISSION SYSTEM (for 2GR-FKS) >> DTC P0795-7F: Pressure Control Solenoid "C" Actuator Stuck Off [10/2017 - 09/2019] >> Description

DTC P0795-7F: Pressure Control Solenoid "C" Actuator Stuck Off [10/2017 - 09/2019]: 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 ECM detects related mechanical problems in the shift solenoid valves, transmission valve body assembly and automatic transmission assembly.

HINT: 

ACTUAL GEAR WHEN A PROBLEM OCCURS IN SHIFT SOLENOID VALVE SL3:

ECM commanded gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear during SL3 stuck ON malfunction 3rd 3rd 3rd 3rd 7th 7th 7th 7th
Actual gear during SL3 stuck OFF malfunction 1st 2nd N (1st)* 4th 5th 6th N* 8th

*: Neutral

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P0795-7F Pressure Control Solenoid "C" Actuator Stuck Off All of the following conditions are met (2-trip detection logic):
  1. Engine coolant temperature is 40°C (104°F) or higher.
  2. ATF temperature is -10°C (14°F) or higher.
  3. The vehicle is driven with the shift lever in D.
  4. No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), oil pressure switch, engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system.
  5. Either of the following conditions is met:
    1. Any of the following conditions are met 2 times:
      1. When gear shifts to 1st are requested by the ECM, the actual gear changes to 3rd gear.
      2. When gear shifts to 2nd are requested by the ECM, the actual gear changes to 3rd gear.
      3. When gear shifts to 4th are requested by the ECM, the actual gear changes to 3rd gear.
      4. When gear shifts to 5th are requested by the ECM, the actual gear changes to 7th gear.
      5. When gear shifts to 6th are requested by the ECM, the actual gear changes to 7th gear.
      6. When gear shifts to 8th are requested by the ECM, the actual gear changes to 7th gear.
    2. When gear shifts to 3rd or 7th are requested by the ECM, the engine speed overruns (neutral status) for 0.5 seconds or more.
 DTC Detection Condition 1, 2, 3, 4 and 5 (a): 
  • Shift solenoid valve SL3
  • Shift solenoid valve SL4
  • Shift solenoid valve SR
  • Shift solenoid valve SLT
  • Transmission valve body assembly
  • Torque converter assembly
  • Automatic transmission assembly

DTC Detection Condition 1, 2, 3, 4 and 5 (b): 
  • Shift solenoid valve SL3
  • Shift solenoid valve SLT
  • Transmission valve body assembly
  • Torque converter assembly
  • Automatic transmission assembly
 Comes on DTC stored SAE Code: P0796
DTC DETECTION CONDITION PATTERNS:

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnostic Condition Engine coolant temperature is 40°C (104°F) or higher. ◦ ◦ ◦ ◦
ATF temperature is -10°C (14°F) or more. ◦ ◦ ◦ ◦
The vehicle is driven with the shift lever in D. ◦ ◦ ◦ ◦
No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), oil pressure switch, engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system. ◦ ◦ ◦ ◦
Malfunction Condition When gear shifts to 1st are requested by the ECM, the actual gear changes to 3rd gear. ◦ - - -
When gear shifts to 2nd are requested by the ECM, the actual gear changes to 3rd gear. - ◦ - -
When gear shifts to 4th are requested by the ECM, the actual gear changes to 3rd gear. - - ◦ -
When gear shifts to 5th are requested by the ECM, the actual gear changes to 7th gear. - - - ◦
Duration 2 times 2 times 2 times 2 times
Detection Logic 2-trip detection logic 2-trip detection logic 2-trip detection logic 2-trip detection logic
DTC DETECTION CONDITION PATTERNS:

  Vehicle Condition
Pattern 5 Pattern 6 Pattern 7 Pattern 8
Diagnostic Condition Engine coolant temperature is 40°C (104°F) or higher. ◦ ◦ ◦ ◦
ATF temperature is -10°C (14°F) or more. ◦ ◦ ◦ ◦
The vehicle is driven with the shift lever in D. ◦ ◦ ◦ ◦
No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), oil pressure switch, engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system. ◦ ◦ ◦ ◦
Malfunction Condition When gear shifts to 6th are requested by the ECM, the actual gear changes to 7th gear. ◦ - - -
When gear shifts to 8th are requested by the ECM, the actual gear changes to 7th gear. - ◦ - -
When gear shifts to 3rd are requested by the ECM, the engine speed overruns (neutral status). - - ◦ -
When gear shifts to 7th are requested by the ECM, the engine speed overruns (neutral status). - - - ◦
Duration 2 times 2 times 0.5 seconds or more 0.5 seconds or more
Detection Logic 2-trip detection logic 2-trip detection logic 2-trip detection logic 2-trip detection logic

HINT: 

This DTC is stored when any of the above detection patterns are met.

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