Engine Runs, But Vehicle Does Not Move In Any Gear (6-Speed A/T)
Probable cause(s)
- Transmission range switch broken or out of adjustment
- Shift cable broken, binding, or out of adjustment
- Connection between shift cable and transmission or shift lever is worn
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- Low ATF level
- ATF pump worn or binding
- Main regulator valve stuck or spring worn
- Foreign material in separator plate orifice
- Manual valve defective
- ATF strainer clogged
- Torque converter regulator valve defective
- Mainshaft worn or damaged
- Countershaft worn or damaged
- Final gears worn or damaged
- Park mechanism defective
- Selector control shaft worn or damaged
- Axle disengaged
NOTE:
- Inspect the transmission range switch . If the transmission range switch fails the inspection, replace the switch. If the inspection is OK, check for proper transmission range switch installation, and adjust the shift cable.
- Check for a loose shift cable at the shift lever and the selector control lever.
- Check for an incorrectly installed transmission, and check the drive plate for wear and damage. Replace the drive plate if it is worn or damaged.
- Replace the torque converter.
- Check the ATF level, and check the ATF lines for leaks and loose connections. If necessary, clean the ATF lines.
- Check the stall speed - Refer to: Stall Speed Test (9-Speed A/T), or Stall Speed Test (6-Speed A/T) .
- Check the line pressure .
- Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
- Check the main regulator valve in the regulator valve body for free movement, and check the valve springs for wear and damage.
- Check for a clogged orifice in the separator plate. If the orifice is clogged, remove it and clean the separator plate orifice.
- Check the manual valve in the manual valve body for wear and damage, and check the manual lever guide pin for wear and damage.
- Check the ATF strainer for debris. If the strainer is clogged, find the damaged components that caused the debris. If no cause for contamination is found, replace the torque converter.
- Check the torque converter regulator valve in the regulator valve body for free movement, and check the valve spring for wear and damage.
- Inspect the differential pinion gears for wear. If the differential pinion gears are worn, replace the differential assembly, replace the ATF strainer, thoroughly clean the transmission, and clean the ATF lines.
- Be careful not to damage the torque converter housing when replacing the main ball bearing. You may also damage the ATF pump when you torque down the main valve body. This will cause ATF pump seizure, use the proper tools.
- Install the main seal flush with the torque converter housing. If you push it into the torque converter housing until it bottoms out, it will block the fluid return passage and result in damage.
- Inspect the mainshaft and the countershaft for wear and damage.
- Inspect the park mechanism at the park lever link and park gear.
- Check the axles.