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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 P0730: Incorrect Gear Ratio >> Diagnostic Procedure

Diagnostic Procedure

NOTE: For connector end views and component locations, see Figure -Figure . For circuit locations, see WIRING DIAGRAMS  .
  1. Perform OBD system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing OBD system check, go to next step.
  2. Visually inspect transaxle cooling system for fluid leaks. Repair as necessary, then go to step  8 . If no leaks are found, go to next step.
  3. Check transaxle fluid. Fill if necessary. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. Go to next step.
  4. Select snapshot mode on scan tool to record transaxle gear ratios. Drive vehicle in 1st, 2nd, 3rd and "D" position with throttle position angle more than 15 percent and vehicle speed more than 5 MPH. Record each gear ratio. Gear ratios should be 2.02-2.23 in Reverse, 2.87-3.13 in 1st gear, 1.54-1.71 in 2nd gear, .91-1.07 in 3rd gear and .61-.72 in "D". If gear ratios are not as specified, go to next step. If gear ratios are as specified, see DIAGNOSTIC AIDS  .
  5. Perform line pressure test. See HYDRAULIC PRESSURE TESTS under PERFORMANCE TESTS in HYDRA-MATIC 4T40-E & 4T45-E OVERHAUL article.
  6. Check for excessive clutch wear and repair as necessary. See HYDRA-MATIC 4T40-E & 4T45-E OVERHAUL article.
    7. NOTE: Clear TAPS function will clear all adapt cells. This may affect transaxle performance. Transaxle will update adapt cell values as vehicle is driven.
  7. Change transaxle fluid and filter. Inspect transaxle fluid for correct level. Add new fluid as necessary. Use scan tool to perform clear TAPS function.
  8. After repair is complete, select DTC on scan tool. Select CLEAR INFO function. Select SPECIFIC DTC and enter DTC "P0730". Drive vehicle in "D" position with throttle position angle more than 15 percent to obtain any one of the following gear ratios for 7 seconds: 2.02-2.23 in Reverse, 2.87-3.13 in 1st gear, 1.54-1.71 in 2nd gear, .91-1.07 in 3rd gear and .61-.72 in "D". If DTC P0730 is not present, repair is complete. If DTC P0730 is still present, repeat test.
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