Purpose/Description Of Test
A stall test is preformed to inspect the overall performance of the automatic transmission and engine assembly by measuring the stall speed in both the DRIVE and REVERSE gear ranges.
Conditions
|     •  | Verify that the automatic transmission fluid (ATF) temperature is between 50-80°C (120-176°F). | 
 
|     •  | All additional electrical loads are OFF. | 
 
Notice: Do not
continuously run the test procedure for longer than 5 seconds because of the
extreme increase in the automatic transmission fluid (ATF) temperature. Also, be
sure to keep the interval between stall tests to more than 1 minute in order
to prevent damage to the automatic transmission internal components.
Procedure
- Chock all 4 wheels and fully apply the parking brake in order to prevent any vehicle movement during testing.
 
- Apply firm pressure to the service brake pedal with the left foot in order to apply the service brakes.
 
- Move the automatic transmission manual gearshift selector from the PARK position to the DRIVE position.
 
- Evenly press the accelerator pedal to the wide-open throttle (WOT) position with the right foot.
 
- Record the maximum engine RPM noted within 5 seconds of achieving the WOT position, and then return to the closed throttle position. Return the gear selector to the PARK position.
 
- Wait 1 minute before proceeding to the next portion of the test procedure.
 
- Move the automatic transmission manual gearshift selector from the PARK position to the REVERSE position.
 
- Evenly press the accelerator pedal to the wide-open throttle (WOT) position with the right foot.
 
- Record the maximum engine RPM noted within 5 seconds of achieving the WOT position, and then return to the closed throttle position. Return the gear selector to the PARK position.
 
Specifications
2,450-2,750 RPM
Stall Test Results
Result 
 | Possible Cause 
 | 
Observed RPM is LOWER than the specification in BOTH DRIVE AND REVERSE ranges 
 | 
|     •  | Torque converter clutch (TCC) internal one-way clutch failure |  
  
 | 
Observed RPM is HIGHER than the specification in DRIVE ONLY 
 | 
|     •  | Line pressure is below specifications |  
  
|     •  | Forward clutch (565) concern |  
  
|     •  | Front internal gear and low clutch sprag assembly (25) concern |  
  
 | 
Observed RPM is HIGHER than the specification in REVERSE ONLY 
 | 
|     •  | Line pressure is below specifications |  
  
|     •  | Direct clutch (562) slipping |  
  
|     •  | Low and reverse clutch (511) slipping |  
  
 | 
Observed RPM is HIGHER than the specification in BOTH DRIVE AND REVERSE ranges 
 | 
|     •  | Line pressure is below specifications |  
  
|     •  | 1-2 reverse clutch (603) slipping |  
  
|     •  | Internal fluid leak concern in each of the selected ranges |  
  
 |