Pressure Testing

Pressure Testing

LINE PRESSURE







1. Support automatic transmission with a jack.
2. Remove rear engine mounting bracket assembly.




3. Remove rear engine mounting insulator R.H.




4. Remove line pressure plug and install oil pressure gauge and adapters.




5. Install rear engine mounting bracket without rear engine mounting insulator R.H.
6. Place a suitable-sized wooden block between transmission and rear engine mounting bracket.
7. Warm up engine until engine oil and A.T.F. reach operating temperature.

A.T.F. temperature: 50 - 80°C (122 - 176°F)

8. Set parking brake and block wheels.
9. Measure line pressure at idle and at stall point while depressing brake pedal fully.

At stall test

5CA2-E Engine:

VG30E Engine:

1. Start engine and place select lever in "D" range.
2. Apply foot brake and accelerate to wide-open throttle.
3. Quickly note the line pressure and immediately release throttle.
4. Shift select lever to "N".
5. Cool off A.T.F.
6. Perform line pressure testing in the same manner as in steps 2 through 6 with select ever in "2", "1" and "R", respectively.
- 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.

Judgment by measuring line pressure

CA20E Engine:

VG30E Engine:

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

1. When line pressure 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 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, pressure regulator valve may have stuck.