Lexus NX: Drive Motor "B" Control Module (P0A1C-710,P0A1C-797,P1C2C-706,P1CA8-708)
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 |
|---|---|---|---|---|---|
| P0A1C-710 | Drive Motor "B" Control Module | MG ECU internal malfunction: Calculation check error (1 trip detection logic) | Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| P0A1C-797 | Drive Motor "B" Control Module | MG ECU internal malfunction: R/D converter communication error (1 trip detection logic) | Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| P1C2C-706 | Drive Motor "B" A/D Converter Circuit | MG ECU internal malfunction: CPU ROM-RAM error (1 trip detection logic) | Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| P1CA8-708 | Drive Motor "B" Control Module Malfunction | MG ECU internal malfunction: CPU ROM-RAM error (1 trip detection logic) | Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0A1C-797 | Rear Motor Revolution |
| P0A1C-710 P1C2C-706 P1CA8-708 | - |
MONITOR DESCRIPTION
The MG ECU performs many diagnostic tests to verify proper operation of internal ECU systems. In one of these tests, the MG ECU checks the result of the rear motor CPU self-test. If the MG ECU detects a "Fail" from the rear motor CPU self-test, it will conclude that there is an internal malfunction in the rear motor CPU and the hybrid vehicle control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A1C (INF 710): MG CPU ALU malfunction P0A1C (INF 797): R/D converter communication error P1C2C (INF 706): A/D malfunction (3GM CPU) P1CA8 (INF 708): RAM and ROM destruction |
| 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 P0A1C (INF 710/797) is not detected DTC P1C2C (INF 706) is not detected DTC P1CA8 (INF 708) is not detected |
CONFIRMATION DRIVING PATTERN
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- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off.
- Turn the power switch on (READY) and after 1 minute or more, turn the power switch off. [A]
- Repeat [A] 3 times. [B]
- Turn the power switch on (IG) and turn the Techstream on.
- Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
-
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.
- Check that the permanent DTCs are cleared.
- If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.
CAUTION / NOTICE / HINT
HINT:
-
If DTC P0A1C-710, P0A1C-797 or P1C2C-706 is output, clear the DTCs, perform the following procedure, and check that the same DTC is not output after the repair.
- Turn the power switch on (IG) and wait for 5 seconds or more.
-
If DTC P1CA8-708 is output, clear the DTCs, perform the following procedure, and check that the same DTC is not output after the repair.
- Turn the power switch on (IG) and wait for 1 minute or more.
PROCEDURE
| 1. | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
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| NEXT | .gif) | COMPLETED |
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SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE FRONT DOOR TRIM COVER LH Click here 2. REMOVE FRONT DOOR INSIDE HANDLE BEZEL PLUG LH Click here 3. REMOVE POWER WINDOW REGULATOR MAST
Fail-safe Chart
FAIL-SAFE CHART Constant Speed Control Mode: Condition Multi-information Display Master Warning Light Cruise Control Indicator Warning Buzzer When the following condition(s) occurs while the vehicle is in motion during cruise control, the system clears the set vehicle speed and cancel
