TROUBLE DIAGNOSES — Final Check (Cont'd)
AT-71spec tableApplies to automatic transmission. Stall test procedure must be followed when measuring line pressure at stall speed.
Final Check (Cont'd)
- 5Start engine and measure line pressure at idle and stall speed.When measuring line pressure at stall speed, follow the stall test procedure.
SAT643A
IMPORTANT
When measuring line pressure at stall speed, follow the stall test procedure.
Line pressure:
Line Pressure
Idle
Line pressure kPa (bar, kg/cm², psi) — D, 2 and 1 ranges471 - 510 (4.71 - 5.10, 4.8 - 5.2, 68 - 74)
Line pressure kPa (bar, kg/cm², psi) — R range657 - 696 (6.57 - 6.96, 6.7 - 7.1, 95 - 101)
Stall
Line pressure kPa (bar, kg/cm², psi) — D, 2 and 1 ranges1,020 - 1,098 (10.20 - 10.98, 10.4 - 11.2, 148 - 159)
Line pressure kPa (bar, kg/cm², psi) — R range1,422 - 1,500 (14.22 - 15.00, 14.5 - 15.3, 206 - 218)
JUDGEMENT OF LINE PRESSURE TEST
Judgement of Line Pressure Test
At idle
JudgementLine pressure is low in all ranges.
Suspected partsOil pump wear; Control piston damage; Pressure regulator valve or plug sticking; Spring for pressure regulator valve damaged; Fluid pressure leakage between oil strainer and pressure regulator valve
At idle
JudgementLine pressure is low in particular range.
Suspected partsFluid pressure leakage between manual valve and particular clutch. For example; If line pressure is low in "R" and "1" ranges but is normal in "D" and "2" range, fluid leakage exists at or around low & reverse brake circuit.
At idle
JudgementLine pressure is high.
Suspected partsMal-adjustment of throttle sensor; Fluid temperature sensor damaged; Line pressure solenoid sticking; Short circuit of line pressure solenoid circuit; Pressure modifier valve sticking; Pressure regulator valve or plug sticking
At stall speed
JudgementLine pressure is low.
Suspected partsMal-adjustment of throttle sensor; Control piston damaged; Line pressure solenoid sticking; Short circuit of line pressure solenoid circuit; Pressure regulator valve or plug sticking; Pressure modifier valve sticking; Pilot valve sticking