Lexus NX: Hybrid Powertrain Control Module (P0A1D-162,P0A1D-821,P0A1D-822,P0A1D-823)
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-162 | Hybrid Powertrain Control Module | ECU internal malfunction (1 trip detection logic) | Hybrid vehicle control ECU | Comes on | Master Warning Light: Comes on |
| P0A1D-821 | Hybrid Powertrain Control Module | ECU internal malfunction (1 trip detection logic) | Hybrid vehicle control ECU | Comes on | Master Warning Light: Comes on |
| P0A1D-822 | Hybrid Powertrain Control Module | ECU internal malfunction (1 trip detection logic) | Hybrid vehicle control ECU | Comes on | Master Warning Light: Comes on |
| P0A1D-823 | 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 many diagnostic tests to verify proper operation of internal ECU systems. In one of these tests, the hybrid vehicle control ECU checks the communication bus off count and the message register of the CAN (Controller Area Network) controller. If the hybrid vehicle control ECU detects an error in the communication bus off count or message register, it will conclude that there is an internal malfunction and will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A1D (INF 162/821/822/823): Lost communication with HV CPU/Monitor CPU |
| 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 162/821/822/823) is not detected |
CONFIRMATION DRIVING PATTERN
.png)
- 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 and wait for 30 seconds or more.
- Turn the power switch on (READY) and after a few seconds, 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:
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Turn the power switch on (IG) and wait for 30 seconds or more.
PROCEDURE
| 1. | REPLACE HYBRID VEHICLE CONTROL ECU |
Click here .gif)
| NEXT | .gif) | COMPLETED |
READ NEXT:
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, r
Hybrid Powertrain Control Module (P0A1D-721,P0A1D-722,P0A1D-723,P0A1D-787,P0A1D-818)
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, r
Drive Motor "A" Temperature Sensor Circuit Low (P0A2C-247,P0A2D-249)
DESCRIPTION Refer to the description for DTC P0A2B-250. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate P0A2C-247 Drive Motor "A" Tempe
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the wiper and washer system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT AUXILIARY BATTERY (a) Measure the auxiliary battery voltage with the power
Start Up Signal Circuit between Radio Receiver Assembly and Navigation ECU
DESCRIPTION This circuit includes the navigation ECU and radio and display receiver assembly. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU) (a) Disconnect the I153 radio receiver assembly connector. (b) Disconnect the I173 navigation ECU
