Lexus NX: Drive Motor "A" Control Module (P0A1B-198)

DESCRIPTION

The MG ECU, which is built into the inverter with converter assembly, monitors its internal operation and will store DTCs if the system is malfunctioning. If any of the following DTCs are output, replace the inverter with converter assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A1B-198

Drive Motor "A" Control Module

MG ECU internal malfunction:

R/D converter NM stop error

(1 trip detection logic)

Inverter with converter assembly

Comes on

Master Warning Light:

Comes on

Related Data List

DTC No.

Data List

P0A1B-198

-

MONITOR DESCRIPTION

The MG ECU (in the inverter with converter assembly) performs many diagnostic tests to verify proper operation of internal ECU systems. In one of these tests, the MG ECU checks for an R/D (Resolver/Digital converter) malfunction involving the motor resolver. If the MG ECU detects an R/D converter error, it will conclude that there is an internal malfunction involving the motor resolver and the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A1B (INF 198): R/D converter NM signal stop abnormality

Required sensors/components

Inverter with converter assembly (MG ECU)

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 P0A1B (INF 198) 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 (READY).
  6. Drive the vehicle at 5 km/h (3 mph) or more for 30 seconds or more. [A]
  7. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]
  8. 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.
  9. Check that the permanent DTCs are cleared.
  10. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

CAUTION / NOTICE / HINT

HINT:

If DTC P0A1B-198 is output, clear the DTCs, perform the following procedure, and check that the same DTC is not output after the repair.

  1. Turn the power switch on (READY).
  2. Drive the vehicle at 5 km/h (3 mph) or more for 30 seconds or more.

PROCEDURE

1.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Click here

NEXT

COMPLETED

READ NEXT:

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SEE MORE:

 Removal

REMOVAL CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. PROCEDURE 1. REMOVE FRONT SEAT ASSEMBLY LH Click here 2. REMOVE FRONT LOWER SEAT CUSHION SHIELD Click here 3. REMOVE FRONT SEAT CUSHION SHIELD LH Click here 4. REMOVE FRONT INNER S

 Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or states of

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