AW Transmission

CAUTION:
- Measure stall speed when measuring line pressure. Line Pressure Measurement
- Never carry out stall speed check if line pressure is too low.

NOTE: Stall speed check provides information mainly on condition of torque converter and transmission clutches. In order for test to give correct results:

- Engine must deliver full power.
- Line pressure must be correct.
- Transmission fluid level and operating temperature must be correct.

Procedure

Pressure Gauge Attachment:

Connect a rev counter so that it can be read from the driver's seat. Air conditioning (AC) system must be switched off. Start engine. Apply handbrake and press brake pedal hard with left foot. Move gear selector to position D and press accelerator to floor.

CAUTION: Carry out for maximum of 5 seconds.

Read maximum speed and line pressure, and compare with values below.

Stall Speed And Line Pressure:

Allow engine to idle for approx. 30 seconds with selector in position N. Apply handbrake and press brake pedal hard with left foot. Move gear selector to position R and repeat test.

Deviations:

High stall speed:
300 r/min higher than normal:

- Incorrect fluid level. Check level. Component Tests and General Diagnostics
- Blocked oil strainer. Remove pump and clean strainer.

300 r/min higher than normal with screeching clutch or brake: Slipping clutch or brake. Dismantle gearbox. Check primarily:

- for gear position R: Clutch C2 and brake B3
- for gear positions D, 1, 2: Clutch C1

Low stall speed:
300 r/min lower than normal: Check that engine is delivering full power.

600 r/min lower than normal with poor acceleration from rest, but normal acceleration over approx. 70 km/h:

- Faulty torque convener. Replace.
- Noise: See fault-tracing procedures below.

No Shift From 3RD to 4TH
No Kickdown From 4TH to 3RD
No Manual Downshift From 4TH to 3RD
No Engine Braking In 3RD
No Engine Braking In 2ND
No Engine Braking In 1ST