Diagnosis Procedure
1.
CHECK TCU DIAGNOSTIC TROUBLE CODE
With M.U.T.-III SE
Check if any DTC is detected in “Diagnostic Trouble Code” of “IVC”.
Is any DTC detected?
Perform diagnosis on the detected DTC. Refer to
DTC Index
.
Replace the Sonar control unit. Refer to
Removal and Installation
.
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With M.U.T.-III SE
Perform diagnosis on the detected DTC. Refer to DTC Index
. 
Replace the Sonar control unit. Refer to Removal and Installation.