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Test Four - Transmission In Reverse NOTE: This test checks pump output, pressure reg- (1) Leave vehicle on hoist and leave gauge C-3292 in place at accumulator port. (2) Move 300 psi Gauge C-3293-SP back to rear servo port. (3) Have helper start and run engine at 1600 rpm for test. (4) Move transmission shift lever four detents rearward from full forward position. This is Reverse (5) Move transmission throttle lever fully forward then fully rearward and note reading at Gauge (6) Pressure should be 145 - 175 psi (1000-1207 kPa) with throttle lever forward and increase to 230 - Test Five - Governor Pressure NOTE: This test checks governor operation by mea- (1) Move 100 psi Test Gauge C-3292 to governor pressure port. (2) Move transmission shift lever two detents rear- ward from full forward position. This is D range. (3) Have helper start and run engine at curb idle speed. Then firmly apply service brakes so wheels (4) Note governor pressure: kPa (3 psi) at curb idle speed and wheels not rotat- • If pressure exceeds 20.6 kPa (3 psi), a fault exists in governor pressure control system. (5) Release brakes, slowly increase engine speed, and observe speedometer and pressure test gauge (do (6) Governor pressure rise should be smooth and drop back to no more than 20.6 kPa (3 psi), after (7) Compare results of pressure test with analysis chart. Test Six - Transmission In Overdrive Fourth Gear NOTE: This test checks line pressure at the over- (1) Remove tachometer; it is not needed for this test. (2) Move 300 psi Gauge to overdrive clutch pres- sure test port. Then remove other gauge and reinstall (3) Lower vehicle. drivers seat. (6) Start engine and shift into D range. occurs and note gauge pressure. (8) Pressure should be 469-496 kPa (68-72 psi) with closed throttle and increase to 620-827 kPa (90- (9) Return to shop or move vehicle off chassis dyno. PRESSURE TEST ANALYSIS CHART TEST CONDITION INDICATION Line pressure OK during Pump and regulator Line pressure OK in R Leakage in rear clutch Pressure low in D Fourth Overdrive clutch piston Pressure OK in 1, 2 but Leakage in front clutch Pressure OK in 2 but low Leakage in rear servo Front servo pressure in 2 Leakage in servo; broken Pressure low in all Clogged filter, stuck Governor pressure too Governor pressure 21 - 268 AUTOMATIC TRANSMISSION - 46RE AN AUTOMATIC TRANSMISSION - 46RE (Continued) |