Lexus NX manuals

Lexus NX: Lost Communication with Drive Motor Control Module "A" (U0110-160)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Lost Communication with Drive Motor Control Module "A" (U0110-160)

DESCRIPTION

The MG ECU, which is built into in the inverter with converter assembly, controls motor (MG2) based on commands from the hybrid vehicle control ECU.

The motor generator control ECU (MG ECU) monitors communication data and detects malfunctions.

A communication error between the MG ECU and hybrid vehicle control ECU is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

U0110-160

Lost Communication with Drive Motor Control Module "A"

Error in signal transmission to the inverter with converter assembly (MG ECU) via serial communication (no transmission, out of communication standard)

(1 trip detection logic)
  • Wire harness or connector
  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on

WIRING DIAGRAM

Refer to the wiring diagram for the inverter low-voltage circuit.

Click here

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.

    Click here

    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.

    Click here

  • If DTC U0110-160 was stored due to incomplete engagement of the connectors, and the system returns to normal when the power switch is turned on (IG) after clearing the DTCs, DTC P324E-788 will be stored. Proceed to troubleshooting without considering DTC P324E-788.

HINT:

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 2 minutes or more.

PROCEDURE

1.

CLEAR DTC

Click here

NEXT

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.

U0110-160 is not output.

CHECK FOR INTERMITTENT PROBLEMS

U0110-160 is output.

3.

CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

(a) Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the following table.

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

(c) Measure the waveform.

Item

Contents

Tester Connection

CH1: A61-24 (HTM+) - I115-6 (E1)

CH2: A61-25 (HTM-) - I115-6 (E1)

Equipment Setting

1 V/DIV., 200 μs./DIV.

Condition

Power switch on (IG)

HINT:

  • Inspect with the connector connected.
  • If pulses are generated, the shape of the waveform can be assumed to be normal.
  • The shape of the waveform may vary according to communication conditions.

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

(d) Turn the power switch off.

The waveform differs from the one shown in the illustration.

GO TO STEP 6

The waveform appears as shown in the illustration.

4.

CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

Click here

The waveform differs from the one shown in the illustration.

GO TO STEP 8

The waveform appears as shown in the illustration.

5.

CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

Click here

The waveform appears as shown in the illustration.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

The waveform differs from the one shown in the illustration.

GO TO STEP 10

6.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the A61 hybrid vehicle control ECU connector.

(c) Disconnect the A58 inverter with converter assembly connector.

Click here

(d) Connect the cable to the negative (-) auxiliary battery terminal.

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

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A61-24 (HTM+) - Body ground

Power switch on (IG)

Below 1 V

A61-25(HTM-) - Body ground

Power switch on (IG)

Below 1 V

NOTICE:

Turning the power switch on (IG) with the connector of the hybrid vehicle control ECU and the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

*b

Front view of wire harness connector

(to Inverter with Converter Assembly)

(g) Turn the power switch off.

(h) Disconnect the cable from the negative (-) auxiliary battery terminal.

(i) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

A61-24 (HTM+) - A58-9 (HTM+)

Power switch off

Below 1 Ω

A61-25(HTM-) - A58-20 (HTM-)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A61-24 (HTM+) or A58-9 (HTM+) - Body ground and other terminals

Power switch off

10 kΩ or higher

A61-25(HTM-) or A58-20 (HTM-) - Body ground and other terminals

Power switch off

10 kΩ or higher

(j) Reconnect the A58 inverter with converter assembly connector.

(k) Reconnect the A61 hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK INVERTER WITH CONVERTER ASSEMBLY

(a) Disconnect the A61 hybrid vehicle control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A61-24 (HTM+) - A61-25 (HTM-)

Power switch off

80 to 170 Ω

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(c) Reconnect the A61 hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE INVERTER WITH CONVERTER ASSEMBLY

8.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK INVERTER WITH CONVERTER ASSEMBLY

Click here

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE INVERTER WITH CONVERTER ASSEMBLY

10.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK INVERTER WITH CONVERTER ASSEMBLY

Click here

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE INVERTER WITH CONVERTER ASSEMBLY

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