Lexus NX: Hybrid Powertrain Control Module (P0A1D-187)

DESCRIPTION

The hybrid vehicle control ECU monitors its internal operation, it will store a DTC and perform fail-safe control if it detects the following malfunction. If the following DTC is output, replace the hybrid vehicle control ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A1D-187

Hybrid Powertrain Control Module

ECU internal malfunction

(1 trip detection logic)

Hybrid vehicle control ECU

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

The hybrid vehicle control ECU performs diagnostic tests to verify proper operation of internal and external ECU systems. In one of these tests, the hybrid vehicle control ECU monitors specific RAM circuits of the hybrid vehicle control ECU. If the hybrid vehicle control ECU detects an error in the RAM circuits, it will conclude that there is an internal malfunction and will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A1D (INF 187): Specific random access memory destruction

Required sensors/components

Hybrid vehicle control ECU

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

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 P0A1D (INF 187) 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) and after a few seconds, turn the power switch off. [A]
  6. Repeat [A] 3 times. [B]
  7. Turn the power switch on (IG) and turn the Techstream on.
  8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
  9. 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.
  10. Check that the permanent DTCs are cleared.
  11. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

CAUTION / NOTICE / HINT

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 30 seconds or more.

PROCEDURE

1.

REPLACE HYBRID VEHICLE CONTROL ECU

Click here

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COMPLETED

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