Troubleshooting Contents: Notes
DANGER
The SRS-ECU adopts the rollover specification that the curtain airbag and seat belt pre-tensioner operate at the occurrence of rollover. Therefore, do not tilt the vehicle to the right and left with the IG ON or tilt the SRS-ECU to the right and left with the IG ON and the harness installed.
CAUTION:
During diagnosis, a diagnostic trouble code associated with other system may be set when the electric motor switch is turned ON with connector(s) disconnected. On completion, confirm all systems for diagnostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.
CAUTION:
- When the diagnostic trouble code (DTC) of the transaxle control module (TCM) is erased, the DTC of the engine control module (ECM) is also erased at the same time.
- If DTC of the Malfunction of CAN communication circuit (Bus off) or DTC of the CAN time-out error (Engine) is set as a current trouble to the TCM, CAN bus diagnosis or troubleshooting each DTC should be carried out since the DTC of TCM will not be erased.
WARNING:
Since the radiator fan rotates during CAN bus line diagnostics, make sure that no one Is servicing the engine compartment before diagnosing the CAN bus line. Since the CAN communication stops when diagnosing the CAN bus line, the ETACS-ECU detects the time-out of the engine control module, and activates the radiator fan to prevent overheating as fail-safe.
Troubleshooting of electronic control systems for which scan tool MB991958 can be used follows the basic outline described below. Even in systems for which scan tool MB991958 cannot be used, some of these systems still follow this outline.