Lexus NX: Transmission system (P3147-239,P3147-241)

DESCRIPTION

The hybrid vehicle transaxle assembly consists of the planetary gear unit, generator (MG1) and motor (MG2). The planetary gear unit uses a planetary gear to split the engine output into mechanical power and electrical power in accordance with driving requests when the vehicle is being driven or the HV battery is being charged. When accelerating, motor (MG2) assists engine output by increasing vehicle driving force. Motor (MG2) also converts braking energy, which would otherwise be consumed in the form of heat during braking, into electrical energy. This recovered energy is stored in the HV battery. Generator (MG1) supplies power, which is used for charging the HV battery or driving motor (MG2), and also regulates the amount of electricity being generated. In addition, generator (MG1) is used as a starter motor to start the engine.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P3147-239	Transmission system	Drive force from motor (MG2) or the engine cannot be transmitted to the wheels. The engine, generator (MG1), motor (MG2) or hybrid vehicle transaxle assembly does not run smoothly due to a mechanical malfunction. (1 trip detection logic)	Engine Hybrid vehicle transaxle assembly Hybrid vehicle control ECU Transmission input damper assembly	Does not come on	Master Warning Light: Comes on
P3147-241	Transmission system	Hybrid vehicle transaxle malfunction (input system lock): When the vehicle is stopped, an engine cranking signal is sent but the generator (MG1) does not rotate. The generator (MG1) or the engine does not rotate, or the planetary gear unit is malfunctioning. (1 trip detection logic)	Engine Hybrid vehicle transaxle assembly Hybrid vehicle control ECU Transmission input damper assembly	Does not come on	Master Warning Light: Comes on

Related Data List

DTC No.	ECU Data List
P3147-239	Motor(MG2) Revolution Motor(MG2) Torq M(MG2) Trq Exec Val Generator(MG1) Rev Generator(MG1) Torq G(MG1) Trq Exec Val Engine Revolution Calculate Load
P3147-241

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK DTC OUTPUT (ENGINE AND ECT)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(d) Check for DTCs.

Powertrain > Engine and ECT > Trouble Codes

Result	Proceed to
Only DTC P0335 is output or SFI system DTCs are not output.	A
DTC P0335 and other SFI system DTCs are output or any SFI system DTCs other than P0335 are output.	B

(e) Turn the power switch off.

B

GO TO DTC CHART (SFI SYSTEM)

A

2.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

(e) Turn the power switch off.

P3147-240 or P3147-242 is also output.

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

P0A1D is also output.

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

DTCs other than P3147-239 and P3147-241 are not output.

3.	CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

(a) Check that the shift lever is in P.

(b) Lift up the vehicle.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:

Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

NOTICE:

Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

OK:

The crankshaft rotates smoothly.

(d) Lower the vehicle.

NG

GO TO STEP 8

OK

4.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Read and record the DTCs and freeze frame data.

Powertrain > Hybrid Control > Trouble Codes

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(f) Read and record the DTCs and freeze frame data.

Powertrain > Engine and ECT > Trouble Codes

(g) Clear the DTCs and freeze frame data.

Powertrain > Hybrid Control > Clear DTCs Powertrain > Engine and ECT > Clear DTCs

(h) Turn the power switch off.

NEXT

5.	CHECK ENGINE RACING

Click here

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

6.	CHECK CREEP MOVEMENT

(a) Turn the power switch on (READY).

(b) Depress the brake pedal, move the shift lever to D, and release the brake pedal.

OK:

The wheels turn (the vehicle creeps forward).

HINT:

If the wheels do not turn and DTC P3147-239 is output, replace the hybrid vehicle transaxle assembly.

(c) Turn the power switch off.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

7.	INSPECT ENGINE SPEED

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Engine Revolution, Motor (MG2) Revolution, Generator (MG1) Rev.

Powertrain > Hybrid Control > Data List

Tester Display
Engine Revolution
Motor(MG2) Revolution
Generator(MG1) Rev

(d) Read the Data List.

(e) Move the shift lever to D.

(f) Fully depress the accelerator pedal when the vehicle speed is 10 km/h (6 mph) or more.

NOTICE:

Perform this test only in an appropriate safe location, in accordance with all local laws.

OK:

The difference between "Engine Revolution" and "0.28 X Generator (MG1) Rev + 0.29 X Motor (MG2) Revolution" is 500 rpm or more and it is maintained for 1 second.

(g) Turn the power switch off.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY

8.	CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

(a) Move the shift lever to N.

(b) Lift up the vehicle.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:

Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection, to prevent the engine from starting.

NOTICE:

Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

OK:

The crankshaft rotates smoothly.

(d) Lower the vehicle.

OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

NG

REPAIR OR REPLACE ENGINE

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