2003 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Service Data

AUTOMATIC TRANSMISSION COMPONENTS SERVICE SPECIFICATION

Line pressure (Wheel locked) D position (Idling) 390 - 460 kPa (4.0 - 4.7 kgf.cm2 , 57 - 67 psi)
Line pressure (Wheel locked) R position (Idling) 0
Line pressure (Wheel locked) D position (Stall) 1,200 - 1,360 kPa (12.2 - 13.8 kgf.cm2 , 174 - 196 psi)
Line pressure (Wheel locked) R position (Stall) 1,640 - 1,960 kPa (16.7 - 19.8 kgf.cm2 , 238 - 282 psi)
Engine stall revolution (D position) 2,700 +/- 150 rpm
Time lag N -->D position
N --> R position		 Less than 1.2 seconds
Less than 1.5 seconds
Engine idle speed (N position and A/C OFF) 700 +/- 50 rpm
Drive plate runout
Torque converter clutch sleeve runout
Torque converter clutch installation (Correct distance)		 Max.
Max.		 0.20 mm (0.0079 in.)
0.30 mm (0.0118 in.)
More than 0.1 mm (0.004 in.)
Shift schedule (NORM and PWR mode)
Differential gear ratio 3.909
D, 4 position
(Throttle valve fully opened)		 1 --> 2
2 --> 3
3 --> 4
4 --> 5
5 --> 4
4 --> 3
3 --> 2
2 --> 1		 47 - 59 km/h (29 - 37 mph)
77 - 88 km/h (48 - 55 mph)
118 - 133 km/h (73 - 83 mph)
168 - 185 km/h (104 - 115 mph)
163 - 176 km/h (101 - 109 mph)
107 - 118 km/h (66 - 73 mph)
60 - 66 km/h (37 - 41 mph)
32 - 38 km/h (20 - 24 mph)
D, 4 position
(Throttle valve fully closed)		 4 --> 5
5 --> 4		 37 - 43 km/h (23 - 27 mph)
21 - 26 km/h (13 - 16 mph)
3 position
(Throttle valve fully opened)		 1 --> 2
2 --> 3
4 --> 3
3 --> 2
2 --> 1		 47 - 59 km/h (29 - 37 mph)
77 - 87 km/h (48 - 54 mph)
123 - 134 km/h (76 - 83 mph)
60 - 66 km/h (37 - 41 mph)
32 - 38 km/h (20 - 24 mph)
2 position
(Throttle valve fully opened)		 1 --> 2
3 --> 2
2 --> 1		 47 - 59 km/h (29 - 37 mph)
82 - 90 km/h (51 - 56 mph)
32 - 38 km/h (20 - 24 mph)
L position
(Throttle valve fully opened)		 2 --> 1 17 - 22 km/h (11 - 14 mph)
Shift schedule (SNOW mode)
Differential gear ratio 3.916
D, 4 position
(Throttle valve fully opened)		 1 --> 2
2 --> 3
3 --> 4
4 --> 5
5 --> 4
4 --> 3
3 --> 2		 35 - 49 km/h (22 - 30 mph)
55 - 73 km/h (34 - 45 mph)
84 - 109 km/h (52 - 68 mph)
121 - 151 km/h (75 - 94 mph)
64 - 88 km/h (40 - 55 mph)
38 - 54 km/h (24 - 34 mph)
17 - 31 km/h (11 - 19 mph)
D, 4 position
(Throttle valve fully closed)		 4 --> 5
5 --> 4		 37 - 43 km/h (23 - 27 mph)
21 - 26 km/h (13 - 16 mph)
3 position
(Throttle valve fully opened)		 1 --> 2
2 --> 3
4 --> 3
3 --> 2		 35 - 49 km/h (22 - 30 mph)
55 - 73 km/h (34 - 45 mph)
123 - 134 km/h (76 - 83 mph)
17 - 31 km/h (11 - 19 mph)
2 position
(Throttle valve fully opened)		 1 --> 2
3 --> 2		 47 - 59 km/h (29 - 37 mph)
82 - 90 km/h (51 - 56 mph)
L position
(Throttle valve fully opened)		 2 --> 1 17 - 22 km/h (11 - 14 mph)
Lock-up point
(Throttle valve opening 5 %)
5th gear (D position) Lock-up ON
Lock-up OFF		 53 - 59 km/h (33 - 37 mph)
52 - 58 km/h (32 - 36 mph)
4th gear (4 position) Lock-up ON
Lock-up OFF		 53 - 59 km/h (33 - 37 mph)
52 - 58 km/h (32 - 36 mph)
Flex lock-up point
(Throttle valve opening 3 %)
D position (When accelerating)
5th gear Lock-up ON
Lock-up OFF		 37 - 43 km/h (23 - 27 mph)
36 - 41 km/h (22 - 25 mph)
4th gear Lock-up ON
Lock-up OFF		 28 - 33 km/h (17 - 32 mph)
27 - 32 km/h (18 - 20 mph)
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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