Lexus NX: Drive Motor "B" Position Sensor Circuit (P0A45-669-P0A47-670)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Drive Motor "B" Position Sensor Circuit (P0A45-669-P0A47-670)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs indicate the resolver output signal is abnormal. The cause of this malfunction may be one of the following:

Area	Main Malfunction Description	Step
Inverter low-voltage circuit	The connectors are not connected properly	2
Rear motor resolver	Open or short circuit in the resolver for rear motor control Internal rear motor malfunction (entry of foreign matter, etc.)	3
Wire harness system between the resolver and inverter with converter assembly	Open or short circuit in the wire harness The connectors are not connected properly	3
Inside of inverter	Inverter with converter assembly internal circuit malfunction	3

DESCRIPTION

Refer to the system description for the rear motor high-voltage circuit.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0A45-669	Drive Motor "B" Position Sensor Circuit	Interphase short in the rear motor resolver circuit: A short circuit between signal lines of rear motor resolver phases is electrically detected. (1 trip detection logic)	Inverter with converter assembly Rear traction motor with transaxle assembly	Comes on	Master Warning Light: Comes on
P0A46-671	Drive Motor "B" Position Sensor Circuit Range / Performance	Rear motor resolver output is out of the normal range (amplitude is too large or too small). (1 trip detection logic)	Inverter with converter assembly Rear traction motor with transaxle assembly	Comes on	Master Warning Light: Comes on
P0A47-670	Drive Motor "B" Position Sensor Circuit Low	Open or short in the rear motor resolver circuit: Rear motor resolver signal is out of the normal range (amplitude is extremely small). (1 trip detection logic)	Inverter with converter assembly Rear traction motor with transaxle assembly	Comes on	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A45-669

Drive Motor "B" Position Sensor Circuit

Interphase short in the rear motor resolver circuit:

A short circuit between signal lines of rear motor resolver phases is electrically detected.

(1 trip detection logic)

Inverter with converter assembly
Rear traction motor with transaxle assembly

Comes on

Master Warning Light:

Comes on

P0A46-671

Drive Motor "B" Position Sensor Circuit Range / Performance

Rear motor resolver output is out of the normal range

(amplitude is too large or too small).

(1 trip detection logic)

Inverter with converter assembly
Rear traction motor with transaxle assembly

Comes on

Master Warning Light:

Comes on

P0A47-670

Drive Motor "B" Position Sensor Circuit Low

Open or short in the rear motor resolver circuit:

Rear motor resolver signal is out of the normal range

(amplitude is extremely small).

(1 trip detection logic)

Inverter with converter assembly
Rear traction motor with transaxle assembly

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

The MG ECU monitors the rear motor resolver output signal. If the MG ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction in the rear motor resolver. If a malfunction is detected, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0A45 (INF 669): Short circuit between phases P0A46 (INF 671): Range check P0A47 (INF 670): Circuit discontinuity or short circuit
Required sensors/components	Rear motor resolver
Frequency of operation	Continuous
Duration	TMC's intellectual property
MIL operation	1 driving cycle
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P0A45 (INF 669) is not detected

DTC P0A46 (INF 671) is not detected

DTC P0A47 (INF 670) is not detected

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 30 seconds or more.
Turn the power switch on (IG) and wait for 5 seconds or more.
Turn the power switch on (READY) with the shift lever in P and wait for 5 seconds or more.
Depress the accelerator pedal of the vehicle with the engine stopped and shift lever in P to start the engine.
Keep the engine running for 5 seconds or more.
Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more. [A]
Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more. [B]
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
Read the current DTCs.
HINT:
- If a current DTC is output, the system is malfunctioning.
- If current DTCs are not output, check for permanent DTCs.
Check that the permanent DTCs are cleared.
If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

WIRING DIAGRAM

Refer to the wiring diagram for the rear motor resolver circuit.

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CAUTION / NOTICE / HINT

CAUTION:

Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
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HINT:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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HINT:

If the problem symptom cannot be reproduced, performing a road test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
If the resolver is malfunctioning, the vehicle may not drive smoothly.
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
1. Turn the power switch on (IG) and wait for 5 seconds or more.
2. Turn the power switch on (READY) with the shift lever in D and wait for 5 seconds or more.
3. Depress the accelerator pedal of the vehicle with the engine stopped and the shift lever in P to start the engine.
4. Keep the engine running for 5 seconds or more.
5. Drive the vehicle forward with the shift lever in D for 5 m or more.
6. Drive the vehicle backward with the shift lever in R for 5 m or more.

PROCEDURE

1.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

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

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
Only P0A45-669, P0A46-671 or P0A47-670 is output, or DTCs other than P06B0-163, P06E6-164, P06D6-511 or P1C73-512 are output simultaneously	A
P06B0-163, P06E6-164, P06D6-511 or P1C73-512 is output simultaneously	B

(e) Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

2.	CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

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Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK REAR MOTOR RESOLVER CIRCUIT

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HINT:

If the "Rear Motor Resolver Circuit" inspection results are normal, perform the next step.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

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