Pressure Test

LINE PRESSURE







1. Install pressure gauge to line pressure port. (When selector lever is in "D", "2" or "1" range, install pressure gauge to port (2) and when in "R" range, install pressure gauge to port (1) shown at left.) Locate the gauge so it can be seen by driver. Measure line pressure in both "R" and "D" ranges at idling and at stall test.
2. Warm up engine until engine oil and A.T.F. reach operating temperatures after the vehicle has been driven approx. 10 minutes.

A.T.F. temperature: 45 - 55°C (113 - 131°F)

3. Measure line pressure at idle and at stall point while depressing brake pedal fully.
- Do not perform tests for more than five seconds at any shift range.
- Do not proceed to next "range" test immediately after one "range" test is done. Wait until oil temperature decreases.

At Idling:

At Stall Test:

Judgment by measuring line pressure
1. When line pressure while idling is low at all positions, the problem may be due to:
- Wear on interior of oil pump
- Oil leakage at or around oil pump, control valve body, transmission case or governor.
- Sticking pressure regulator valve
- Sticking pressure modifier valve

2. When line pressure while idling is low at a particular position, the problem may be due to the following:
- If oil leaks at or around forward clutch (rear) or governor, line pressure is low in "D", "2" or "1" range but is normal in "R" range.
- If oil leaks at or around low and reverse brake circuit, line pressure becomes low in "R" or "P" range but is normal in "D", "2" or "1" range.

3. When line pressure is high while idling, pressure regulator valve may have stuck.
If line pressure does not rise, first check to make sure that throttle wire is connected properly.


LOCK-UP TEST






Install pressure gauge to lock-up pressure port. Shift selector lever in "D" range.

If lock-up pressure is not within specifications, refer to Troubleshooting Chart ((A4)).