Lexus NX: Hybrid Vehicle Control ECU Communication Stop Mode

Lexus NX Service Manual / Power Source & Network / Networking / Can Communication System / Hybrid Vehicle Control ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Hybrid Vehicle Control ECU Communication Stop Mode

Any of the following conditions are met:

  • Communication stop for "Hybrid Vehicle Control" is indicated on "Communication Bus Check".

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "Hybrid Vehicle Control ECU Communication Stop Mode" in "DTC Combination Table".

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  • Hybrid vehicle control ECU CAN main wire or connector
  • Hybrid vehicle control ECU CAN branch wire or connector
  • Power source circuit of hybrid vehicle control ECU
  • Hybrid vehicle control ECU ground circuit
  • Hybrid vehicle control ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

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  • When disconnecting and reconnecting the auxiliary battery.

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    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

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  • Some parts must be initialized and set when replacing or removing and installing parts.

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  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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HINT:

  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

CHECK FOR OPEN IN CAN BUS WIRE (HYBRID VEHICLE CONTROL ECU MAIN WIRE AND BRANCH WIRE)

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

(b) Disconnect the hybrid vehicle control ECU connectors.

*a

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

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

Standard Resistance:

Bus 2 Branch Wire

Tester Connection

Condition

Specified Condition

I115-34 (CA2H) - I115-35 (CA2L)

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω

Bus 5 Main Wire

Tester Connection

Condition

Specified Condition

I116-25 (CA1H) - I116-24 (CA1L)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

Result

Proceed to

OK

A

NG (Bus 2 branch wire)

B

NG (Bus 5 main wire)

C

B

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

C

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

A

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the hybrid vehicle control ECU connectors.

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I115-6 (E1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

I115-5 (E01) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

I116-4 (E12) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

I116-5 (E02) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

(c) Reconnect the cable to the negative (-) auxiliary battery terminal.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I116-3 (BATT) - Body ground

Power switch off

11 to 14 V

A60-1 (+B2) - Body ground

Auxiliary battery voltage applied to terminal A61-6 (MREL)

11 to 14 V

A61-4 (+B1) - Body ground

Auxiliary battery voltage applied to terminal A61-6 (MREL)

11 to 14 V

A60-3 (IG2) - Body ground

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

A60-22 (ACCI) - Body ground

Power switch on (ACC)

11 to 14 V

Power switch off

Below 1 V

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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