Technical Description (Comment)

The scan tool MB991958 shows a DTC status as active. 

• The sensor system of the EV-ECU may be defective.

The scan tool MB991958 shows a DTC status as stored. 

• Carry out diagnosis with particular emphasis on wiring harness and connector failures between EV-ECU and sensor. For diagnostic procedures, refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO TREAT PAST TROUBLE .
  NOTE: For a past trouble, you cannot find it by the scan tool MB991958 CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS and check the CAN bus lines. You can narrow down the probable cause of the trouble by referring to the DIAGNOSTIC TROUBLE CODE , which is set regarding the CAN communication-linked ECUs (Refer to CAN BUS LINE DIAGNOSTIC FLOW .