Torque Converter

NOTE: After each test (5 seconds maximum), shift transaxle into Neutral and run engine for at least one minute to cool torque converter and transaxle fluid.

CAUTION: Do not maintain Wide Open Throttle (WOT) in any gear for more than 5 seconds. If engine RPM exceeds maximum specified stall speed, release accelerator immediately. Clutch or band slippage is indicated.

The stall speed test checks the operation of the following items:

Forward Clutch
Reverse Clutch
Low One-Way Clutch (Roller)
Forward One-Way Clutch (Sprag)
Engine Performance

Apply service and parking brakes. Connect tachometer or appropriate scan tool to engine, and record RPM reached in each selector lever range (except Neutral) at WOT. Stall speed should be 1800-2100 RPM. If stall speed exceeds specification, ensure engine is mechanically okay and tuned to specification. If engine is okay, remove torque converter and check torque converter one-way clutch for slippage.
If stall speed is too high in "D", "2" or "1" position, the following components may be faulty:
- Forward Clutch
- Forward One-Way Clutch
- Low One-Way Clutch
If stall speed is too high in "R" position, the following components may be faulty:
- Low/Reverse Clutch
- Reverse Clutch
If stall speed is too low in all ranges, the following components may be faulty:
- Poor Engine Performance
- Forward One-Way Clutch