Lexus NX manuals

Lexus NX: Hybrid Battery Positive Contactor Control Circuit Low (P0ADB-227)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Hybrid Battery Positive Contactor Control Circuit Low (P0ADB-227)

DESCRIPTION

Refer to the description for DTC P0AE6-225.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0ADB-227

Hybrid Battery Positive Contactor Control Circuit Low

Short to ground in the SMRB circuit:

Primary circuit of SMR (+) is malfunctioning.

(2 trip detection logic)
  • Wire harness or connector
  • Hybrid battery junction block assembly
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P0ADB-227
  • VL-Voltage before Boosting
  • VH-Voltage after Boosting
  • Power Resource VB
  • SMRP Status
  • SMRB Status
  • SMRG Status
  • SMRP Control Status
  • SMRB Control Status
  • SMRG Control Status
  • Conv Shutdown
  • MG2 Inverter Shutdown
  • MG1 Inverter Shutdown

WIRING DIAGRAM

Refer to the wiring diagram for the HV battery high-voltage line 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 DTC P0ADB-227 is output, the power switch cannot be turned on (READY).
  • After the repair, clear the DTCs, perform the following procedure and check that the same DTC (including pending DTC) is not output.
    1. Turn the power switch off and wait for 30 seconds or more.
    2. Turn the power switch on (READY) and wait for 30 seconds or more.
    3. Turn the power switch off and wait for 60 seconds or more.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)

(a) Disconnect the I115 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

I115-4 (SMRB) - Body ground

Power switch off

20.6 to 40.8 Ω

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(c) Reconnect the I115 hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

2.

CHECK CONNECTOR CONNECTION CONDITION (NO. 2 HYBRID BATTERY PACK WIRE CONNECTOR)

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) Check the connection condition of the No. 2 hybrid battery pack wire connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

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OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

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
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

3.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HYBRID BATTERY JUNCTION BLOCK 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) Remove the No. 2 hybrid vehicle battery shield reinforcement.

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(c) Disconnect the y1 hybrid battery junction block assembly connector.

(d) Disconnect the I115 hybrid vehicle control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I115-4 (SMRB) or y1-4 (SMRB) - Body ground and other terminals

Power switch off

10 kΩ or higher

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

*b

Rear view of wire harness connector

(to Hybrid Battery Junction Block Assembly)

(f) Reconnect the I115 hybrid vehicle control ECU connector.

(g) Reconnect the y1 hybrid battery junction block assembly connector.

(h) Install the No. 2 hybrid vehicle battery shield reinforcement.

OK

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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