Stall Speed Test
4F27E
Stall Speed Test
WARNING: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.
NOTICE: Always carry out the Line Pressure Test procedures prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out the Stall Speed Test or further transaxle damage will occur.
NOTE: The Stall Speed Test should be carried out with the engine and transaxle at normal operating temperatures.
This test checks operation of the following items:
- Torque Converter Clutch (TCC)
- Forward clutch
- Low One-Way Clutch (OWC) assembly
- Engine driveability concerns
1. Connect a scan tool.
2. NOTICE: After testing each of the following ranges D, L and R, move the selector lever to N (NEUTRAL) and run the engine at 1,000 rpm for about 15 seconds to allow the torque converter to cool before testing the next range. Failure to allow the torque converter to cool can cause the transaxle to overheat.
NOTICE: Do not maintain Wide Open Throttle (WOT) in any range for more than 5 seconds or transaxle damage can occur.
NOTICE: If the engine rpm recorded by the tachometer exceeds maximum specified rpm, release the accelerator pedal immediately, or further transaxle damage will occur. Clutch or band slippage is indicated.
NOTE: Prolonged use of this procedure may set DTCs P0712 and/or P1783. After carrying out Stall Speed Test, run On-Board Diagnostic (OBD) Test and clear DTCs from memory.
Press accelerator pedal to floor Wide Open Throttle (WOT) in each range. Record rpm reached in each range. Stall speeds should be as follows:
Stall Speed Chart:
3. If stall speeds were too high, refer to the following Stall Speed Diagnosis Chart. If stall speeds were too low, first check the engine idle speed. If engine idle is OK, remove the torque converter and check the torque converter One-Way Clutch (OWC) for slippage.
Stall Speed Diagnosis Chart:
