Lexus NX: Lost Communication with ECM / PCM "A" (U0100-530,U0126-735,U0129-527,U0129-528,U0140-146,U0151-763,U0164-827,U1107-436)
DESCRIPTION
The hybrid vehicle control ECU transmits and receives signals via CAN communication to and from the ECM, skid control ECU assembly, power steering ECU assembly, main body ECU, airbag ECU assembly, and air conditioning amplifier assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| U0100-530 | Lost Communication with ECM / PCM "A" | A CAN communication error between the ECM and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Comes on | Master Warning Light: Comes on |
| U0126-735 | Lost Communication with Steering Angle Sensor Module | A CAN communication error between the steering angle sensor and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Comes on AWD Warning: Comes on |
| U0129-527 | Lost Communication with Brake System Control Module | A CAN communication error (V BUS) between the skid control ECU assembly and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Comes on |
| U0129-528 | Lost Communication with Brake System Control Module | A CAN communication error between the skid control ECU assembly and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Comes on |
| U0140-146 | Communication Error from Body ECU to HV ECU | A CAN communication error between the main body ECU and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Comes on |
| U0151-763 | Communication Error from Airbag ECU to HV ECU | A CAN communication error between the airbag ECU assembly and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Comes on |
| U0164-827 | Communication Error from A/C ECU to HV ECU | A CAN communication error between the air conditioning amplifier assembly and hybrid vehicle control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Does not come on |
| U1107-436 | Lost Communication with Power Management Module | A CAN communication error between the certification ECU (smart key ECU assembly) (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Does not come on | Master Warning Light: Comes on |
MONITOR DESCRIPTION
If the hybrid vehicle control ECU detects a problem with CAN communication with the ECU, it will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | U0100 (INF 530): Performance |
| Required sensors/components | Main: Hybrid vehicle control ECU Sub: CAN bus line |
| 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 U0100 (INF 530) is not detected |
CONFIRMATION DRIVING PATTERN
- 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 (IG) and turn the Techstream on.
- Turn the power switch on (READY) and wait for 2 minutes or more. [A]
- Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]
-
Read the current DTCs.
HINT:
- If a current DTC is output, the system is malfunctioning.
- If current DTCs are not output, perform the following steps to check for permanent DTCs.
- Check that the permanent DTCs are cleared.
- If the permanent DTCs are not cleared, perform a 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 2 minutes or more.
PROCEDURE
| 1. | CHECK DTC OUTPUT |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Check for DTCs of all systems by following the prompts on the Techstream screen.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes(e) Turn the power switch off.
| Hybrid vehicle control ECU outputs P2532-772 |  | GO TO DTC CHART (P2532-772) |
| Hybrid vehicle control ECU does not output P2532-772 | | GO TO CAN COMMUNICATION SYSTEM |
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