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Home >> Saturn >> 2000 >> LS Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transaxle Diagnosis - 4T40-E & 4T45-E >> Diagnostic Tests >> DTC P0756: 2-3 Shift Solenoid Performance >> Diagnostic Procedure

Diagnostic Procedure

NOTE: For connector end views and component locations, see Figure -Figure . For circuit locations, see WIRING DIAGRAMS  .
  1. Ensure on-board diagnostic system check has been performed. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. Go to next step.
  2. Check transaxle fluid level. Fill if necessary. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. Go to next step.
  3. Connect scan tool to DLC. Turn ignition switch to ON position. Using scan tool, record freeze frame and failure records for reference. Clear DTC. Select snapshot mode on scan tool. Record current gear and gear ratio. Drive vehicle in "D" position to obtain 1-2, 2-3 and 3-4 shifts with throttle position angle more than 8 percent and vehicle speed more than 5 MPH for 5 seconds. If 1st/4th gear ratio is .61:1-.72:1 and 2nd/3rd gear ratio is .91:1-1.07:1, go to next step. If 1st/4th gear ratio is not .61:1-.72:1 and 2nd/3rd gear ratio is not .91:1-1.07:1, see DIAGNOSTIC AIDS  .
  4. Determine if engine labors during start off and 3rd gear is indicated when 1st gear is commanded. If engine does not labor during start off and 3rd is not indicated when 1st gear is commanded, go to next step. If engine labors during start off and 3rd gear is indicated when 1st gear is commanded, go to step  6 .
  5. Repair 2-3 shift circuit. Check 2-3 shift circuit for 2-3 shift solenoid mechanically stuck off, 2-3 shift solenoid "O" ring damage or 2-3 shift valve stuck in released (downshift) position. Repair as necessary, then go to step  7 .
  6. Repair 2-3 shift circuit. Check 2-3 shift circuit for 2-3 shift solenoid mechanically stuck on, or 2-3 shift valve stuck in applied (upshift) position. Repair as necessary, then go to next step.
  7. After repair is complete, select DTC on scan tool. Select CLEAR INFO function. Select SPECIFIC DTC and enter DTC "P0756". Drive vehicle in "D" position. Allow transaxle to shift through all gears. Actual gear ratios must match commanded gears for .75 seconds for all gears. If DTC P0756 is not present, repair is complete. If DTC P0756 is still present, repeat test.
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