ATSG - Gear Ratio Error Codes Slipping Away Figure 5ATSG - Gear Ratio Error Codes Slipping Away Figure 6

ATSG - Gear Ratio Error Codes Slipping Away Figure 7 ATSG - Gear Ratio Error Codes Slipping Away Figure 8

 

Now, rather than having a gear ratio code, a performance code or codes are set for the specific solenoid or solenoids responsible in making the shift change and holding the gear. is that solenoids are primarily doing most of the work controlling both the shift and clutch pressure. There are fewer valves in the valve body as a result of this. However, the tech still needs to consider all that is in play when there is a performance code set for a shift/pressure control solenoid.

This brings us back to the seven solenoids used in the 6T30/40/45/50 series transmission. The codes for these solenoids offer both hydraulic and mechanical performance codes and as well as electrical malfunctions with the exception of the Line Pressure Control Solenoid. This solenoid only has electrical malfunction codes assigned to it at this time. The codes and their basic definitions are as follows:

 

Shift Solenoid Valve 1 On/Off Normally Closed Solenoid

  • P0751 - Shift Solenoid Valve 1 Stuck Off
  • P0752 - Shift Solenoid Valve 1 Stuck On
  • P0973 - Shift Solenoid Valve 1 Circuit Low Voltage
  • P0974 - Shift Solenoid Valve 1 Circuit High Voltage

 

Pressure Control Solenoid Valve 2 Normally High Solenoid

  • P0776 - PCSV2 Stuck Off (Hydraulic/Mechanical Performance Malfunction)
  • P0777 - PCSV2 Stuck On (Hydraulic/Mechanical Performance Malfunction)
  • P0965 - PCSV2 Performance (Internal Electrical Performance Malfunction)
  • P0966 - PCSV2 Circuit Low Voltage
  • P0967 - PCSV2 Circuit High Voltage

 

Pressure Control Solenoid Valve 3 Normally High Solenoid

  • P0796 - PCSV3 Stuck Off (Hydraulic/Mechanical Performance Malfunction)
  • P0797 - PCSV3 Stuck On (Hydraulic/Mechanical Performance Malfunction)
  • P0969 - PCSV3 Performance (Internal Electrical Performance Malfunction)
  • P0970 - PCSV3 Circuit Low Voltage
  • P0971 - PCSV3 Circuit High Voltage

 

Pressure Control Solenoid Valve 4 Normally Low Solenoid

  • P2714 - PCSV4 Stuck Off (Hydraulic/Mechanical Performance Malfunction)
  • P2715 - PCSV4 Stuck On (Hydraulic/Mechanical Performance Malfunction)
  • P2719 - PCSV4 Performance (Internal Electrical Performance Malfunction)
  • P2720 - PCSV4 Circuit Low Voltage
  • P2721 - PCSV4 Circuit High Voltage

 

Pressure Control Solenoid Valve 5 Normally Low Solenoid

  • P2723 - PCSV5 Stuck Off (Hydraulic/Mechanical Performance Malfunction)
  • P2724 - PCSV5 Stuck On (Hydraulic/Mechanical Performance Malfunction)
  • P2728 - PCSV5 Performance (Internal Electrical Performance Malfunction)
  • P2729 - PCSV5 Circuit Low Voltage
  • P2730 - PCSV5 Circuit High Voltage

 

Torque Converter Clutch Pressure Control Solenoid Valve Normally Low Solenoid

  • P0741 - TCC PCSV Stuck Off (Hydraulic/Mechanical Performance Malfunction)
  • P0742 - TCC PCSV Stuck On (Hydraulic/Mechanical Performance Malfunction)
  • P2762 - TCC PCSV Performance (Internal Electrical Performance Malfunction)
  • P2763 - TCC PCSV Circuit Low Voltage
  • P2764 - TCC PCSV Circuit High Voltage

 

Line Pressure Control Solenoid Valve Normally High Solenoid

  • P0961 - PCSV Performance (Internal Electrical Performance Malfunction)
  • P0962 - PCSV Circuit Low Voltage
  • P0963 - PCSV Circuit High Voltage

 

You will notice in Figure 6 that there are four pressure control solenoids used to operate a specific clutch assembly. This is done through each of these solenoids having its own respective regulating valve. In other words, PCSV2 operates the 3-5-R clutch through a 3-5-R regulating valve to achieve 3rd, 5th and Reverse gears. PCSV 3 works the same way through its own regulating valve to achieve 4th, 5th and 6th gears. PCSV4 is responsible for 2nd and 6th gears while PCSV5 controls the 1-2-3-4 clutch in gears 1st through 4th, both through their own respective regulating valves (Figure 7).

More of this article will be continued in Gear Ratio Error Codes Slipping Away - Part 3 of 3


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