| Excessive shock or engine revs up abnormally high on 5-6 upshift or 6-5 downshift |
- Shift solenoid valve A defective
- Shift solenoid valve B defective
- A/T clutch pressure control solenoid valve A defective
- A/T clutch pressure control solenoid valve B defective
- A/T clutch pressure control solenoid valve C defective
- Transmission fluid pressure switch E (6th clutch) defective
- Foreign material in separator plate orifice
- A/T clutch pressure control solenoid valve A accumulator defective
- A/T clutch pressure control solenoid valve B accumulator defective
- 5th air check valve stuck
- 6th air check valve stuck
- 5th clutch defective
- 6th clutch defective
- Clearance between clutch end-plate and top disc incorrect
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- Inspect the shift solenoid valves A and B function with the HDS.
- Check for a seized shift solenoid valve, and inspect the O-rings.
- Inspect A/T clutch pressure control solenoid valve A with the HDS.
- Inspect A/T clutch pressure control solenoid valve B with the HDS.
- Inspect A/T clutch pressure control solenoid valve C with the HDS.
- Check for a clogged orifice in the separator plate. If the orifice is clogged, remove it and clean the separator plate orifice.
- Check the 5th and 6th clutch pressures .
- Inspect the clutch clearance for the 5th and 6th clutches .
- Check the A/T clutch pressure control solenoid valve A and B accumulator pistons, the O-rings, and the springs in the secondary valve body for wear and damage.
- Check for a stuck 5th air check valve in the torque converter housing.
- Check for a stuck 6th air check valve in the stator shaft support.
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| Symptom |
Probable cause(s) |
Notes |
| Noise from transmission in all shift lever positions |
- ATF pump worn or binding
- Lubrication regulator valve defective
- Lubrication shift valve defective
- Final gears worn or damaged
- Idler gears worn or damaged
- Thrust washers seized, worn or damaged
- Mainshaft, countershaft, secondary shaft, and third shaft bearings worn or damaged
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- 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.
- 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.
- 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.
- 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.
- Check the ball bearing for the mainshaft, the countershaft, the secondary shaft, and the third shaft.
- Inspect the mainshaft, the countershaft, the secondary shaft, the third shaft, and idler gears for wear and damage.
- Check the thrust washers on all shafts for seizure, wear, and damage.
- Check the lubrication regulator valve and the lubrication shift valve in the main valve body for free movement, and check the valve springs for wear and damage.
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| Noise from transmission in D |
- A/T clutch pressure control solenoid valve A defective
- A/T clutch pressure control solenoid valve B defective
- A/T clutch pressure control solenoid valve C defective
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- Inspect A/T clutch pressure control solenoid valve A with the HDS.
- Inspect A/T clutch pressure control solenoid valve B with the HDS.
- Inspect A/T clutch pressure control solenoid valve C with the HDS.
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| Noise from transmission in R |
Reverse gears worn or damaged |
- Inspect the reverse idler gear shaft/holder for wear and damage.
- Inspect the reverse selector gear teeth chamfers, and inspect the engagement teeth chamfers of the third shaft reverse gear and the reverse selector hub. Replace the reverse gears and the reverse selector if they are worn or damaged. If the transmission makes clicking, grinding, or whirring noises, also replace the third shaft 4th gear, the reverse idler gear, the mainshaft 3rd gear, and the countershaft 2nd gear.
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| Vehicle does not accelerate above 34 mph (55 km/h) |
Torque converter one-way clutch defective |
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| Symptom |
Probable cause(s) |
Notes |
| Vibration in all shift lever positions |
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- ATF pump worn or binding
- Transmission or engine mount defective
- Low engine output (horsepower)
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- 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.
- 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.
- 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.
- Replace the torque converter.
- 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.
- Inspect the transmission or engine mount.
- Check The Valve Adjustment
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- Check the engine control system.
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| Shift lever does not operate smoothly |
- Transmission range switch defective or out of adjustment
- Shift cable broken, binding, or out of adjustment
- Connection between shift cable and transmission or shift lever is worn
- Manual valve defective
- Selector control shaft worn or damaged
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- 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 the manual valve in the main valve body for wear and damage, and check the manual lever guide pin for wear and damage.
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| Transmission does not shift into P |
- Shift cable broken, binding, or out of adjustment
- Connection between shift cable and transmission or shift lever is worn
- Park mechanism defective
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- Check for a loose shift cable at the shift lever and the selector control lever.
- Inspect the countershaft and the secondary shaft for wear and damage.
- Inspect the park mechanism at the parking holder and park gears.
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| Symptom |
Probable cause(s) |
Notes |
| Torque converter clutch does not disengage |
- Shift solenoid valve C defective
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- Lock-up shift valve defective
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- Inspect the shift solenoid valve C function with the HDS.
- Check for a seized shift solenoid valve, and inspect the O-rings.
- 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.
- 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 .
- Replace the torque converter.
- 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.
- Check the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage.
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| Torque converter clutch does not operate smoothly |
- A/T clutch pressure control solenoid valve D defective
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- Torque converter regulator valve defective
- Lock-up control valve defective
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- Inspect A/T clutch pressure control solenoid valve D with the HDS.
- Check the line pressure .
- 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.
- Check the stall speed - Refer to: Stall Speed Test(9-Speed A/T), or Stall Speed Test(6-Speed A/T) .
- Replace the torque converter.
- 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.
- Check the torque converter regulator valve and the lock-up control valve in the regulator valve body for free movement, and check the valve springs for wear and damage.
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| Symptom |
Probable cause(s) |
Notes |
| Torque converter clutch does not engage |
- Shift solenoid valve C defective
- A/T clutch pressure control solenoid valve D defective
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- Torque converter regulator valve defective
- Lock-up shift valve defective
- Lock-up control valve defective
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- Inspect the shift solenoid valve C function with the HDS.
- Check for a seized shift solenoid valve, and inspect the O-rings.
- Inspect A/T clutch pressure control solenoid valve D with the HDS.
- Check the line pressure .
- 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.
- Check the stall speed - Refer to: Stall Speed Test(9-Speed A/T), or Stall Speed Test(6-Speed A/T) .
- Replace the torque converter.
- 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.
- Check the torque converter regulator valve and the lock-up control valve in the regulator valve body for free movement, and check the valve springs for wear and damage.
- Check the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage.
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| A/T gear position indicator does not indicate shift lever positions |
- Transmission range switch defective or out of adjustment
- Shift cable broken, binding, or out of adjustment
- Connection between shift cable and transmission or shift lever is worn
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- 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.
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| Speedometer and odometer do not work |
Output shaft (countershaft) speed sensor defective |
- Check the output shaft (countershaft) speed sensor installation.
- Inspect the output shaft (countershaft) speed sensor O-ring for wear and damage.
- Check for a poor connection at the output shaft (countershaft) speed sensor.
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| Symptom |
Probable cause(s) |
Notes |
| Engine does not start |
- Transmission range switch defective 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
- ATF pump worn or binding
- Mainshaft worn or damaged
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- 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.
- 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.
- 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.
- Replace the torque converter.
- Inspect the mainshaft.
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| Engine stalls when shifted to D from N |
- Shift solenoid valve C defective
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- Torque converter regulator valve defective
- Lock-up shift valve defective
- Lock-up control valve defective
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- Inspect the shift solenoid valve C function with the HDS.
- Check for a seized shift solenoid valve, and inspect the O-rings.
- 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.
- 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.
- 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.
- Replace the torque converter.
- Check the torque converter regulator valve and the lock-up control valve in the regulator valve body for free movement, and check the valve springs for wear and damage.
- Check the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage.
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| Symptom |
Probable cause(s) |
Notes |
| Engine stops when shifted to R from N |
- Drive plate defective or transmission incorrectly installed
- Torque converter clutch piston defective
- Torque converter defective
- Torque converter regulator valve defective
- Lock-up shift valve defective
- Lock-up control valve defective
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- 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.
- 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.
- 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.
- Replace the torque converter.
- Check the torque converter regulator valve and the lock-up control valve in the regulator valve body for free movement, and check the valve springs for wear and damage.
- Check the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage.
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| No engine braking |
- Shift cable broken, binding, or out of adjustment
- Connection between shift cable and transmission or shift lever is worn
- Output shaft (countershaft) speed sensor defective
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- Check for a loose shift cable at the shift lever and the selector control lever.
- Check the output shaft (countershaft) speed sensor installation.
- Inspect the output shaft (countershaft) speed sensor O-ring for wear and damage.
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| Engine does not rev to high rpm, and the transmission upshifts at low rpm (engine at normal operating temperature) |
- VTEC rocker arms defective
- Low fuel pressure
- Engine low on power
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