Lexus NX manuals

Lexus NX: DC / DC Converter Temperature Sensor "A" Range / Performance (P0C39-626,P0C3C-625)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / DC / DC Converter Temperature Sensor "A" Range / Performance (P0C39-626,P0C3C-625)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs indicate the boost converter temperature sensor (upper) value is abnormal. The cause of this malfunction may be one of the following:

Internal inverter malfunction
  • Inverter with converter assembly internal circuit malfunction
Hybrid cooling system malfunction
  • Coolant circulation abnormal (frozen or leaking, etc.)
Inverter low-voltage circuit malfunction
  • The connectors are not connected properly

DESCRIPTION

The MG ECU, which is built into in the inverter with converter assembly, detects the temperature of the boost converter using the temperature sensor built into the boost converter. If necessary, the MG ECU will limit inverter output to help prevent boost converter overheating. The hybrid vehicle control ECU also detects malfunctions in the sensor based on the temperature sensor values. The inverter with converter assembly detects malfunctions in the boost converter temperature sensor and its wiring.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0C39-626

DC / DC Converter Temperature Sensor "A" Range / Performance

Boost converter temperature (upper) calculated by the hybrid vehicle control ECU is different from the actual temperature for 10 seconds or more, and the boost converter temperature (upper) is excessively high.

(1 trip detection logic)
  • Inverter cooling system
  • Cooling fan system
  • Inverter with converter assembly
  • Wire harness or connector

Comes on

Master Warning Light:

Comes on

P0C3C-625

DC / DC Converter Temperature Sensor "A" Intermittent / Erratic

Sudden change in boost converter temperature (upper) sensor output or hunting:

Either of the following conditions is met:

  • Unusual sudden change in boost converter temperature sensor (upper) output occurs and the offset continues for a certain period of time.*
  • Unusual sudden change in boost converter temperature sensor (upper) output occurs repeatedly.*

(1 trip detection logic)
  • Inverter cooling system
  • Cooling fan system
  • Inverter with converter assembly
  • Wire harness or connector

Comes on

Master Warning Light:

Comes on

HINT:

*: If only DTC P0C3C-625 is output, a temperature sensor malfunction is more likely to be the cause than a sudden change in actual temperature.

Related Data List

DTC No.

ECU Data List

P0C39-626
  • DC/DC Cnv Temp (Upper)
  • DC/DC Cnv Temp (Lower)

P0C3C-625

MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the boost converter temperature sensor, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0C39 (INF 626): DC / DC Converter Temperature Sensor "A" Range / Performance

P0C3C (INF 625): DC / DC Converter Temperature Sensor "A" Intermittent / Erratic

Required sensors/components

Boost converter temperature sensor

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 P0C39 (INF 626) is not detected

DTC P0C3C (INF 625) is not detected

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 30 seconds or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. Turn the power switch on (READY).
  7. With the shift lever in P, wait for 90 seconds. [A]

    HINT:

    Check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).

  8. Perform a road test according to the freeze frame data "Vehicle Spd" for approximately 10 minutes. [B]
  9. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
  10. Read the current DTCs.

    HINT:

    • If a current DTC is output, the system is malfunctioning.
    • If a current DTC is not output and want to confirm permanent DTC, perform the following procedure.
  11. Check that permanent DTCs are cleared. If no permanent DTC is output, the system is normal.
  12. If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.

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

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 (READY) and wait for 90 seconds or more.
  2. Drive the vehicle for approximately 10 minutes referring to the freeze frame data or Data List item: "Vehicle Spd".

PROCEDURE

1.

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

Result

Proceed to

P0C39-626 or P0C3C-625 only is output, or DTCs except the ones in the table below are also output.

A

Any of the following DTCs are also output.

B

Relevant DTC

P0A93-346

Inverter Cooling System Performance

P0C73-776

Motor Electronics Coolant Pump "A" Control Performance

P314A-828

Inverter Coolant Pump Speed Signal

HINT:

P0C39-626 or P0C3C-625 may be output as a result of the malfunction indicated by the DTCs above.

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

2.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

Click here

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 COOLING SYSTEM

Click here

HINT:

If the "Cooling System" inspection results are normal, perform the next step.

NEXT

REPLACE INVERTER WITH CONVERTER ASSEMBLY

READ NEXT:

 DC / DC Converter Temperature Sensor "B" Range / Performance (P0C3E-628,P0C41-627)

DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate the boost converter temperature sensor (lower) value is abnormal. The cause of this malfunction may be one of the following: Internal inverter

 Motor Electronics Coolant Pump "A" Control Performance (P0C73-776)

DESCRIPTION The inverter water pump assembly transmits rotation speed information to the hybrid vehicle control ECU. The hybrid vehicle control ECU monitors the speed and detects malfunctions. DTC

 Hybrid Battery System Discharge Time Too Long (P0C76-523)

DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU detects that the electrical charge stored in the high-voltage condenser of the inverter with converter assembly cannot be discharged.

SEE MORE:

 Power Source Circuit

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 Removal

REMOVAL PROCEDURE 1. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY Click here 2. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (a) Disconnect the camshaft timing oil control valve assembly connector. (b) Remove the bolt and camshaft timing oil control valve assembly from the cylinder

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