Lexus ES: Lost Communication with Airbag System Control Module Signal Plausibility Failure (P310764)
DESCRIPTION
Refer to the description for DTC P310711.
Click here .gif)
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P310764 | Lost Communication with Airbag System Control Module Signal Plausibility Failure | Abnormal communication signal: Communication from the airbag ECU assembly stopped and signal plausibility failure has been detected for a certain period. (1 trip detection logic) |
| Does not come on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P310764 | Airbag Status (Collision) |
CONFIRMATION DRIVING PATTERN
HINT:
After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
- 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 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- With power switch on (IG) and wait for 2 minutes or more.
- Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P310711.
Click here
PROCEDURE
| 1. | CHECK DTC OUTPUT (SRS AIRBAG) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Body Electrical / SRS Airbag / Trouble Codes.
(d) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes| Result | Proceed to |
|---|---|
| Airbag system DTCs are not output. | A |
| Airbag system DTCs are output. | B |
(e) Turn the power switch off.
| B | .gif) | GO TO DTC CHART (AIRBAG SYSTEM) |
|
.gif)
| 2. | CLEAR DTC |
Click here
|
| 3. | CHECK DTC OUTPUT (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes| Result | Proceed to |
|---|---|
| P310764 is not output. | A |
| P310764 is output again. | B |
(e) Turn the power switch off.
| B | | GO TO STEP 5 |
|
| 4. | CHECK FOR INTERMITTENT PROBLEMS |
Click here
| OK | | REPLACE AIR BAG ECU ASSEMBLY |
| NG | | REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
| 5. | CHECK AIR BAG ECU ASSEMBLY (CHECK WAVEFORM) |
Click here
| Result | Proceed to |
|---|---|
| The waveform appears as shown in the illustration. | A |
| The waveform differs from the one shown in the illustration. | B |
| A | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
| 6. | CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
Click here
| NG | | CONNECT SECURELY |
|
| 7. | CHECK CONNECTOR CONNECTION CONDITION (AIRBAG ECU ASSEMBLY CONNECTOR) |
Click here
| NG | | CONNECT SECURELY |
|
| 8. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG ECU ASSEMBLY) |
Click here
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 9. | CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - BODY GROUND) |
Click here
| OK | | REPLACE AIR BAG ECU ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message (P312387)
DESCRIPTION Refer to the description for P0D2D16. Click here The MG ECU, which is built into in the inverter with converter assembly, controls motor (MG2) based on commands from the hybrid vehicle c
Transmission (Shaft) Mechanical Linkage Failure (P314779)
DTC SUMMARY Refer to the DTC summary for DTC P1C7779. Click here DESCRIPTION Refer to the description for DTC P1C7779. Click here DTC No. Detection Item DTC Detection Condition Trouble Ar
Motor Electronics Coolant Pump "A" No Signal (P314A31)
DESCRIPTION Refer to the description for DTC P0C7396. Click here The inverter water pump assembly sends the inverter water pump speed (measured value) signal to the hybrid vehicle control ECU. DT
SEE MORE:
Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)
DESCRIPTION Refer to DTC P012011. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note P21352B Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled The difference between the output voltage of VTA1 and VTA2
Operation Check
OPERATION CHECK INPUT SIGNAL CHECK (a) Connect the Techstream to the DLC3. (b) Check the steering pad switch assembly using the Data List function of the Techstream (cruise control main switch, -SET switch, +RES switch and CANCEL switch). Click here *1 Steering Pad Switch Assembly *a C
