DTC C1991 [DSC/RSC]

id0402b3811800

DTC | C1991 | DSC/RSC sensor (abnormal initialization) system
DETECTION CONDITION | • The DSC/RSC sensor detects that the initialization procedure has not been performed.
POSSIBLE CAUSE | • The initialization procedure for the DSC/RSC sensor has not been performed • DSC/RSC HU/CM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY INITIALIZATION PROCEDURE. • Has the DSC/RSC sensor initialization procedure been performed? | Yes | Go to the next step.
No | Perform the DSC/RSC sensor initialization procedure, then go to the next step. (See DSC/RSC SENSOR INITIALIZATION PROCEDURE.)
2 | VERIFY DTC TROUBLESHOOTING COMPLETED • Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS [DSC/RSC].) • Is the same DTC present? | Yes | Repeat the inspection from Step 1. If the malfunction occurs again, replace the DSC/RSC HU/CM, then go to the next step. (See DSC/RSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC/RSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No | Go to the next step.
3 | VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present? | Yes | Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DSC/RSC].)
No | DTC troubleshooting completed.