System Pressure and Stall Speed Check
SPECIAL TOOLS- Hose and manometer tool No. 999 2531, or equivalent
- Nipple tool No. 999 5074, or equivalent
1. Check oil level
- See Checking/Adjusting Oil Level.
2. Connect manometer
- Undo the air filter.
- Remove transmission test plug and fit nipple tool No. 999 5074, or equivalent.
- Connect hose and manometer tool No. 999 2531, or equivalent, to the nipple.
3. Checking engine idle speed
- Start engine and allow it to idle in position N.
- Check the engine idle speed.
See table below.
4. Checking system pressure
- Depress brake pedal.
- Move gear selector into the various positions and record system pressure.
In position D (Drive):
At idle: 0.4 MPa (57 psi)
At stall Speed: 1.2 MPa (171 psi)
In position R (Reverse):
At idle: 0.6 MPa (85 psi)
At stall Speed: 1.8 MPa (256 psi)
5. Check stall speed while monitoring line pressure.
- Stall speed test gives an indication of condition of the torque converter, the transmission clutches and the engine.
- For the test to be accurate the following conditions must be met:
Engine must be properly tuned
Correct line pressure
Correct oil level and transmission at normal operating temperature.
NOTE: Never conduct a stall speed check when line | pressure is too low.
6. Check
- Attach an engine speed sensor (rpm sensor) so that it can be read from the driver's seat.
- The Air Conditioning (A/C) must be turned off.
- Block all four wheels.
- Start engine.
CAUTION: Apply parking brake and press down hard on the brake pedal with left foot during test.
- Move gear selector to position D, depress Accelerator Pedal (AP) to floor for maximum 5 seconds and read off maximum engine rpm and line pressure.
- Compare with the specifications below.
NOTE: Do not test stall speed for longer than 5 seconds.
In position D (Drive):
Line Pressure: 1.2 MPa (171 psi)
Stall Speed: 2600 rpm
In position R (Reverse):
Line Pressure: 1.8 MPa (256 psi)
Stall Speed: 2600 rpm
NOTE: Normal stall speed at sea level and at ambient temperature of +20°C = 68°F (engine speed decreases by 120 rpm per 1000 m above sea level, and 50-100 rpm per 10°C = 50°F over +20°C = 68F ambient temperature).
- If the speed exceeds the table value, proceed to step 7, if the speed is below the table value, proceed to step 8.
7. High stall speed
- The test conditions described in step 5 must apply here also.
- Is the 0-100 km/h (0-60 mph) acceleration time normal?
- If the stall speed recorded exceeds the normal value by more than 300 rpm:
Check whether oil is discolored or has a burnt smell as at operation. Checking Oil Quality
If the oil appears normal replace the torque converter, per Transmission/torque converter, replacement.
If the oil is dirty this indicates warm or burnt clutch plates, replace transmission see Replacement.
- Test stall speed again after replacing transmission.
8. Low stall speed
- The test conditions described in step 5 must apply here also.
- If the stall speed recorded exceeds the normal value by more than 300 rpm:
Replace torque converter per Transmission/torque converter, replacement.
- Check stall speed again after replacement of torque converter.
If the fault recurs, perform operation as per Transmission/torque converter, replacement.
- Noises:
Perform operation as per Transmission/torque converter, replacement.
- Test stall speed again after replacing transmission.