Service manual page AT-63 on automatic transmission line pressur…

F TROUBLE-SHOOTING AND DIAGNOSES ) Line pressure {To nigh-reverse clutch (Frontli 2 Line pressure [To forward clutch iHearll Governor pressure I.) Toroue converter Inckvun pressure SAT475 LINE PRESSURE 1. Install pressure gauge to line pressure port. (When shift lever is in D, 2" or 1" range, install pressure gauge to port (2 and when in R range, install pressure gauge to port i shown above.) Locate the gauge so it can be seen by driver, Measure line pressure both of "R" and D range at idling and at stall test. Pressure Testing 2. Warm up engine untll engine oil and A.T.F, reach operating temperatures. A.T.F. temperature: 43 . 57C (109 ~ 135 F) 3. Measure line pressure at idle and at stall point while depressing brake pedal fully. At idling Flange Line pressure kPalkg/Cm:,p31l R 528775(6,4~7.9,91-112) D 245 - 343 (2.5 . 3.5, 36 - 50) 2 245 343 l2.5 . 3.5, 36 - 50) 'l 245 - 343 (2.5 - 3451 36 ~ 50) At stall test 0 Do not perform tests for more than five seconds at any shift range. 0 Do not proceed to next "range test immedi- ately after one range test is done. Wait until oil temperature decreases. Rsnge Line pressure kPa (kg/cm1,psi) n 1,2751,471113.o-15.o.1357213) o 518595 (5.34.1.90-101: 2 5497696(5.6~7,1,807101l r 549~696l5.6-7.1,80-101) Judgment by measuring line pressure ll When line pressure while idling IS low at all positions, the problem may be due to: I Wear on interior of all pump I Oil leakage at or around oil pump, control valve body, transmissmn case or governor - Sticking pressure regulator valve Sticking pressure modifier valve 2] When line pressure while idling is low at a partlr cular position, the problem may be due to the following: I If oil leaks at or around forward clutch lrearl or governor, line pressure IS low in "',D "2" or "1" range but is normal in R" range.