Transmission Stall Speed Test
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.
NOTE:
Perform the Transmission Line Pressure Test prior to performing the Transmission Stall Speed Test. If the line pressure is low at stall, do not perform the Transmission Stall Speed Test or transmission damage will occur.
The Transmission Stall Speed Test checks:
- torque converter operation and installation.
- holding ability of the forward clutch.
- reverse clutch.
- planetary One-Way Clutch (OWC).
- engine driveability concerns.
Conduct this test with the engine coolant and transmission fluid at correct levels and at normal operating temperature.
Apply the park brake and firmly apply the brake pedal for each Transmission Stall Speed Test.
Stall Speed Chart
| Engine | rpm |
|---|---|
| 1.5L Gasoline Turbocharged Direct Injection (GTDI) | 2, 350-2, 650 |
| 2.0L Gasoline Turbocharged Direct Injection (GTDI) | 2, 350-2, 650 |
| 2.5L Independent Variable Cam Timing (iVCT) | 2, 350-2, 650 |
- Connect the diagnostic scan tool.NOTE: If the recorded rpm exceeds the maximum limits, release the accelerator pedal immediately, clutch slippage is indicated.
- In each of the following ranges Drive, Low and Reverse, press the accelerator pedal to WOT. Do not hold the throttle open for more than 5 seconds.
- Record the results in each range.
- After each range, move the selector lever to NEUTRAL and run the engine at 1, 000 rpm for 15 seconds to cool the torque converter before conducting the next test.
- Refer to the Stall Speed Diagnosis Chart for possible source.NOTE: The stall speed is lower in REVERSE.
- If stall speeds were too high, refer to the Stall Speed Diagnosis Chart. If stall speeds were too low, check engine idle speed. If engine idle speed is OK, remove torque converter and check for slippage.
Stall Speed Diagnosis Chart
| Range | Possible Source |
|---|---|
| D, L | Forward Clutch |
| Low/Reverse Clutch | |
| Low/One-Way Clutch (OWC) | |
| R | Low/Reverse Clutch |
| Direct Clutch |