Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Lexus GX 470FACTORY OEM SERVICE PROCEDURE
Service Data
AUTOMATIC TRANS SERVICE DATA
| A750F | ||
|---|---|---|
| Line pressure (Wheel locked) | Engine idling | |
| D position | 362 - 420 kPa (3.7 - 4.3 kgf.cm2 , 53 - 61 psi) | |
| R position | 500 - 580 kPa (5.1 - 5.9 kgf.cm2 , 72 - 84 psi) | |
| AT stall (Throttle valve fully opened) | ||
| D position | 1,360 -1,460kPa (13.9 -14.9 kgf.cm2 ,198 - 212 psi) | |
| R position | 1,255 -1,415 kPa (12.8 - 14.4 kgf.cm2 , 182 - 205 psi) | |
| Engine stall revolution | D and R positions | 2,150 +/- 150rpm |
| Time lag | N --> D position | Less than 1.2 seconds |
| N --> R position | Less than 1.5 seconds | |
| Engine idle speed (A/C OFF) | N position | 700 +/- 50 rpm |
| Drive plate runout | Max. | 0.20 mm (0.0079 in.) |
| Torque converter runout | Max. | 0.30 mm (0.0118 in.) |
| Torque converter clutch installation distance | More than 17.1 mm (0.673 in.) | |
| Shift schedule D position |
||
| (Throttle valve fully opened) | 1 --> 2 | 49 - 61 km/h (29 - 37 mph) |
| 2 --> 3 | 87 - 97 km/h (52 - 58 mph) | |
| 3 --> 4 | 122 - 138 km/h (73 - 83 mph) | |
| 4 --> 5 | 178-194 km/h (107-116 mph) | |
| 5 --> 4 | 171-186 km/h (103-112 mph) | |
| 4 --> 3 | 113 - 126 km/h (68 - 76 mph) | |
| 3 --> 2 | 76 - 84 km/h (46 - 50 mph) | |
| 2 --> 1 | 38 - 44 km/h (23 - 26 mph) | |
| (Throttle valve fully closed) | 4 --> 5 | 35 - 41 km/h (21 - 25 mph) |
| 5 --> 4 | 26-31 km/h (16-19 mph) | |
| 3 position | ||
| (Throttle valve fully opened) | 1 --> 2 | 49 - 61 km/h (29 - 37 mph) |
| 2 --> 3 | 57-97 km/h (34-58 mph) | |
| 4 --> 3 | 128 - 141 km/h (77 - 85 mph) | |
| 3 --> 2 | 76 - 84 km/h (46 - 50 mph) | |
| 2 --> 1 | 38 - 44 km/h (23 - 26 mph) | |
| 2 position | ||
| (Throttle valve fully opened) | 1 --> 2 | 49 - 61 km/h (29 - 37 mph) |
| 3 --> 2 | 87 - 95 km/h (52 - 57 mph) | |
| 2 --> 1 | 38 - 44 km/h (23 - 26 mph) | |
| L position | ||
| (Throttle valve fully opened) | 2 --> 1 | 44 - 51 km/h (26 - 31 mph) |
| Lock-up point | Throttle valve opening 5 % | |
| D position | ||
| 5th gear | Lock-up ON | 72 - 80 km/h (43 - 48 mph) |
| Lock-up OFF | 65 - 72 km/h (39 - 43 mph) | |
| 4 position | ||
| 4th gear | Lock-up ON | 66 - 73 km/h (40 - 44 mph) |
| Lock-up OFF | 58 - 65 km/h (35 - 39 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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