If the self test result is 'No response', the engine cannot communicate with the sensor. The magnetometer
and proximity sensors share the same supply voltage and I2C bus with the accelerometer. You can use both
Magnetometer Test and DiPro Test to rule out the possibility that power supplies are broken (VAUX 2.8V &
VIO 1.8V) or that the I2C bus is not working on the engine side. Additionally, if INT1 signal path is broken,
the self test will fail with the result 'No response'. If the Accelerometer Self Test fails and some other self test
passes, change the accelerometer and retest.
If the self test result is 'Minor', the sensor element self test has failed and a pop-up window will open
automatically. Change the sensor and retest. Error details can be identified from Detailed Result. The last 3
bytes (in hexadecimal form) indicate the difference between the above mentioned two measurements for
each axis. See the following figure where the Detailed Result is for a test 'Passed'. The Detailed Result
information is important when communicating with the R&D regarding accelerometer failures. For limits,
click More Information.
Figure 7 Accelerometer self test
Magnetometer troubleshooting
Magnetometer Self Test can verify the sensor functionality completely. It verifies that the sensor can
communicate with the engine and that healthy data is available from all 3 axes.
If the self test result is 'No response', the engine cannot communicate with the sensor. Most likely, the sensor
is broken, solder joints have cracked, or, as sometime happens, the sensor is upside down, rotated or missing
completely.
If the self test fails, the result is 'Minor', a pop-up window will open and the error cause can be read from
Detailed Result. The data is in hexadecimal format and, to find out the failure details, needs to be converted
into binary format.
RM-750
BB Troubleshooting and Manual Tuning Guide
Issue 1
COMPANY CONFIDENTIAL
Page 3 – 23
Copyright © 2011 Nokia. All rights reserved.
