Judgement of Line Pressure Test

If line pressure does not rise, first check to make sure that throttle wire is connected properly.

When line pressure while idling is low at all positions ("D", "2", "1", "R" and "P"), 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.

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 low & reverse brake circuit, line pressure becomes low in "R" position but is normal in "P", "D", "2" or"1" position.

When line pressure is high while idling, pressure regulator valve may have stuck.