Lexus NX: Hybrid Transaxle System
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT FLUID PRESSURE OF OIL PUMP
(a) Remove the rear engine under cover LH.
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| (b) Remove the fluid pump cover plug and O-ring from the hybrid vehicle transaxle assembly. |
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| (c) Install SST to the hybrid vehicle transaxle assembly. SST: 09993-19015 09993-00020 09993-00030 |
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(d) Put the engine in inspection mode.
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(e) Measure the fluid pressure.
Standard:
| Engine Speed | Fluid Temperature | Transaxle Fluid Pressure |
|---|---|---|
| 1000 rpm | 20 to 50 °C (68 to 122 °F) | 6 kPa (0.06 kgf/cm2, 0.87 psi) or more |
NOTICE:
Be sure to cancel the inspection mode immediately after the hybrid transaxle fluid pressure check is completed.
(f) Remove SST from the hybrid vehicle transaxle assembly.
(g) Install a new O-ring and fluid pump cover plug to the hybrid vehicle transaxle assembly.
Torque:
8.0 N·m {82 kgf·cm, 71 in·lbf}
(h) Install the rear engine under cover LH.
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2. ROAD TEST
CAUTION:
Confirm the safety of the working environment, then start the inspection.
NOTICE:
- Perform engine inspection and adjustment before starting a road test.
- Perform a road test at normal operating fluid temperature 50 to 80°C (122 to 176°F).
- Make sure the air conditioning switch and cruise control switch are off.
| Check Item | Check Procedure |
| S position test | With the shift lever in S (while the vehicle is stopped), move the shift lever to "+" to check that the shift position indicated on the combination meter changes as follows: 1 → 2, 2 → 3, 3 → 4, 4 → 5 and 5 → 6. |
| Downshifting | While driving with the S3 range selected and a vehicle speed of approximately 92 km/h (57 mph), move the shift lever to "-" and check that the transmission shifts to the S2 range. HINT: If the vehicle speed exceeds 94 km/h (58 mph), downshifting cannot be performed. |
| While driving with the S2 range selected and a vehicle speed of approximately 53 km/h (33 mph), move the shift lever to "-" and check that the transmission shifts to the S1 range. HINT: If the vehicle speed exceeds 55 km/h (34 mph), downshifting cannot be performed. | |
| P position test | Stop the vehicle on an incline (more than 5°) and after moving the shift lever to P, release the parking brake and check that the parking lock pawl holds the vehicle in place. |
| Noise and vibration | Check for noise and vibration when driving the vehicle and during gear changes. |
| Fluid leaks | After performing a road test, check for fluid leaks. |
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Components
COMPONENTS ILLUSTRATION *1 SERVICE PLUG GRIP *2 BATTERY SERVICE HOLE COVER *3 HYBRID BATTERY SERVICE PLUG COVER - - N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUST
Removal
REMOVAL CAUTION / NOTICE / HINT CAUTION: The engine assembly with hybrid vehicle transaxle assembly is very heavy. Be sure to follow the procedure described in the repair manual, or the engine lifter
SEE MORE:
ECU Power Source Circuit
DESCRIPTION If the power switch is on (IG), the hybrid vehicle control ECU applies current to the MREL terminal to turn the IGCT relay on. This supplies power to the +B1 and +B2 terminals. WIRING DIAGRAM Refer to the wiring diagram for DTC P0A08-264. Click here PROCEDURE 1. CHECK HYBRID VE
Passenger Side Buckle Switch Circuit Malfunction (B1771)
DESCRIPTION The front passenger side buckle switch circuit consists of the occupant detection ECU and front seat inner belt assembly RH. DTC B1771 is stored when a malfunction is detected in the front passenger side buckle switch circuit. Troubleshoot DTC B1771 first when DTCs B1771 and B1795 are ou
