DTC U0074, U0123, U1901 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2887600

DTC | U0074, U0123, U1901 | Combined sensor system (CAN2 line malfunction)
DETECTION CONDITION | • U0074 ― Communication error with combined sensor is detected in CAN communication. • U0123 ― Error is detected in received data from combined sensor in CAN communication. • U1901 ― Error is detected in transmitted data to combined sensor in CAN communication.
POSSIBLE CAUSE | • Open or short circuit in the CAN2_L wiring harness between combined sensor terminal B and DSC HU/CM terminal AS • Open or short circuit in the CAN2_H wiring harness between combined sensor terminal C and DSC HU/CM terminal AR • Combined sensor malfunction • DSC HU/CM malfunction • Poor connection at connectors (female terminal)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT COMBINED SENSOR SIGNAL (CAN2 LINE) FOR OPEN CIRCUIT • Disconnect the DSC HU/CM connectors. • Disconnect the combined sensor connectors. • Inspect for continuity between the DSC HU/CM connectors (vehicle harness-side) and the following combined sensor connector terminals (vehicle harness-side): ― Combined sensor (CAN2_L): B—AS ― Combined sensor (CAN2_H): C—AR • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 4.
2 | INSPECT COMBINED SENSOR SIGNAL (CAN2 LINE) FOR SHORT CIRCUIT • Inspect for continuity between the following DSC HU/CM connector terminals (vehicle harness-side) and body ground: ― Combined sensor (CAN2_L): B ― Combined sensor (CAN2_H): C • Is there continuity? | Yes | Repair or replace the wiring harness, then go to Step 4.
No | Go to the next step.
3 | INSPECT THE COMBINED SENSOR • Reconnect all disconnected connectors. Inspect the combined sensor. (See COMBINED SENSOR INSPECTION.) • Is the combined sensor normal? | Yes | Go to the next step.
No | Replace the combined sensor, then go to the next step. (See COMBINED SENSOR REMOVAL/INSTALLATION.)
4 | VERIFY THAT THE SAME DTC IS NOT PRESENT • Make sure to reconnect all disconnected connectors. • Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Are the same DTCs present? (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) | Yes | Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
No | Go to the next step.
5 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) | Yes | Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
No | DTC troubleshooting completed.