Special Testing Procedures

Special Testing Procedures





The special tests are designed to aid the technician in diagnosing the hydraulic and mechanical portions of the transaxle.

Line Pressure Test









NOTICE: Carry out the Line Pressure Test prior to carrying out the Stall Speed Test. If the line pressure is low at stall, do not carry out the Stall Speed Test or further transaxle damage will occur. Do not maintain Wide Open Throttle (WOT) in any transaxle range for more than 5 seconds.

NOTICE: Do not mistake the transmission fluid drain plug for the line pressure tap plug or the transmission fluid will have to be refilled.

This test verifies that the line pressure is within specification.

1. Connect a pressure gauge to the line pressure tap.

2. Start the engine and check the line pressure. Refer to the Line Pressure Chart to determine if the line pressure is within specification.

Line Pressure Chart






3. If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for line pressure concerns.

4. When the pressure tests are completed, install the pressure tap plug.
- Tighten to 9 Nm (80 lb-in).


Line Pressure Diagnosis Chart






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: Carry out Line Pressure Test prior to carrying out Stall Speed Test. If the line pressure is low at stall, do not carry out Stall Speed Test or further transaxle damage will occur.

The Stall Speed Test checks:

- Torque Converter Clutch (TCC) operation and installation.

- holding ability of the forward clutch.

- reverse clutch (the low-reverse bands).

- 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 parking brake firmly for each Stall Speed Test.

Stall Speed Chart






1. Connect the scan tool.

2. NOTE: If the recorded rpm exceeds the maximum limits, release the accelerator pedal immediately because clutch or band slippage is indicated.
In each of the following ranges D, L and R, press the accelerator pedal to the floor and hold it just long enough to let the engine get to Wide Open Throttle (WOT). While making this test, do not hold the throttle open for more than 5 seconds at a time.


3. Note the results in each range.

4. After each range, move the selector lever to NEUTRAL and run the engine at 1,000 rpm for about 15 seconds to cool the torque converter before making the next test.

5. Use the Stall Speed Diagnosis Chart for corrective actions.

6. NOTE: The stall speed in REVERSE will be lower.
If stall speeds were too high, see the Stall Speed Diagnosis Chart. If stall speeds were too low, first check engine idle speed and tune up. If engine is OK, remove torque converter and check TCC (Torque Converter Clutch) for slippage.


Stall Speed Diagnosis Chart