The CHASSISD_VOLTAGE_SENSOR_INIT message is reported in the system message file whenever the chassis control process (chassisd) cannot initialize a voltage sensor on a component.
The chassis control process (chassisd) cannot initialize a voltage sensor on a component.
When a component is powered up, chassisd attempts to initialize the voltage sensor on the component (field-replaceable unit or FRU). If the chassisd process cannot initialize the voltage sensor for the indicated component, it generates the CHASSISD_VOLTAGE_SENSOR_INIT message.
Below are some examples of the message. The component for which chassisd was unable to initialize the voltage sensor is also listed.
chassisd[543]: CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 5 (group 93, address 123) chassisd[543]: CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 5 (group 93, address 123) chassisd[1577]: CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 0 (group 18, address 53) /kernel: PCF8584(WR): target ack failure on byte 0 /kernel: PCF8584(WR): (i2c_s1=0x08, group=0x12, device=0x35) chassisd[1577]: CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 0 (group 18, address 53) /kernel: PCF8584(WR): transmit failure on byte 0 /kernel: PCF8584(WR): (i2c_s1=0x00, group=0x11, device=0x4a) chassisd[1522]: CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 1 (group 18, address 53) CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 8 (group 26, address 53) CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 0 (group 16, address 53) CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for CB 1 (group 23, address 53) chassisd[1301]: CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for FPC 1 (group 17, address 53) CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for CB 0 (group 16, address 53) chassisd[3241]: %DAEMON-3-CHASSISD_VOLTAGE_SENSOR_INIT: Unable to initialize voltage sensor for CB 1 (group 17, address 53)
Possible causes for the messages include:
- Component hardware failure.
- Faulty seating of the component in the midplane.
- Faulty Power Entry Module (PEM).
- Incorrect version of the Junos OS for the hardware installed in the router.
Perform these steps to determine the cause and resolve the problem (if any):
1. Collect the show command output to help determine the cause of this message.
Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.
show log messages show log chassisd
2. Analyze the show command output:
- If there are messages indicating a fault with a PEM, it is likely that the CHASSISD_VOLTAGE_SENSOR_INIT messages are due to the PEM. Open a case with your technical support representative to resolve the PEM issue.
- If there are messages indicating a hardware failure of the FRU reporting the CHASSISD_VOLTAGE_SENSOR_INIT message, it is likely that the messages are due to a hardware failure in the FRU. Continue with Step 4.
3. Determine if an MPC is installed in the router:
- If the router contains an MPC, make sure that the router is running a version of the Junos OS that supports the MPC (see Table 7 in the MX Series Line Card Guide).
- If the router is running a version of the Junos OS that does not support the MPC, the CHASSISD_VOLTAGE_SENSOR_INIT messages are likely due to an incorrect version of the Junos OS. Upgrade the router to a version of the Junos OS that supports the installed MPC.
4. If all else fails, reseat the affected FRU (during a maintenance window).
- If the error no longer occurs, the CHASSISD_VOLTAGE_SENSOR_INIT messages are due to a faulty connection.
- If the messages continue, swap the FRU with a similar FRU in a different slot.
- If the messages follow the FRU, the FRU has failed.
- If the messages stay with the slot, the slot is faulty.
- In either case, the messages are due to a hardware failure. Open a case with your technical support representative.