I2C bus fault messages

The System Event/Error Log may contain I2C bus fault messages from both the Service Processor Diagnostic and the Advanced System Management processor, indicated by the source DIAGS and SERVPROC, respectively. The format of the DIAGS messages from the revision ARY115 and later are formatted as either

I2C Bus x bad or devices on this bus are functioning incorrectly.

or

I2C Busses x, y, ... , z bad or devices on these busses are functioning incorrectly.

where the numbers listed x, y, ..., z represent any of the busses that are experiencing a fault. The table below provides the appropriate actions to take for each bus number listed.

Message

Action

 

 

 

Failure reading I2C device. Check devices on bus 0.

1.

Reseat Service Processor Board

 

 

2.

Replace Service Processor Board

 

3.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 1.

1.

Reseat power supplies

 

 

2.

Replace power supplies

 

3.

Replace power backplane

 

4.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 2.

1.

Reseat front panel connectors

 

 

2.

Replace front panel

 

3.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 3.

1.

Replace System Board

 

 

 

 

Failure reading I2C device. Check devices on bus 4.

1.

Reseat Service Processor Board

 

 

2.

Replace Service Processor Board

 

3.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 5.

1.

Reseat CPUs

 

 

2.

Replace CPUs

 

3.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 6.

1.

Reseat memory card

 

 

2.

Replace memory card

 

3.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 7.

1.

Replace System Board

 

 

 

 

Failure reading I2C device. Check devices on bus 8.

1.

Replace SCSI backplane

 

 

2.

Replace power backplane

 

3.

Replace System Board

 

 

 

Failure reading I2C device. Check devices on bus 9.

1.

Reseat DIMMs 1, 2, 3, and 4

 

 

2.

Replace DIMMs 1, 2, 3, and 4

 

3.

Replace memory card

 

4.

Replace System Board

 

 

 

Symptom-to-FRU index 117

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IBM 8682 manual I2C bus fault messages, Message Action

8682 specifications

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