DTC U1901, U2527 [DSC]

id040220804600

DTC

U1901, U2527

Combined sensor system (CAN2 line malfunction)

DETECTION CONDITION

• U1901
- The signal from the combined sensor is not within specification.
• U2527
- Open or short circuit in CAN system wiring harness is detected.

POSSIBLE CAUSE

• Open or short circuit in the CAN2_L wiring harness between combined sensor terminal A and DSC HU/CM terminal T
• Open or short circuit in the CAN2_H wiring harness between combined sensor terminal B and DSC HU/CM terminal H
• 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): T-A
- Combined sensor (CAN2_H): H-B
• 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): T
- Combined sensor (CAN2_H): H
• 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.
• Is the combined sensor normal?
Yes
Go to the next step.
No
Replace the combined sensor, then go to the next step.
4
VERIFY THAT THE SAME DTC IS NOT PRESENT
• Clear the DTCs from the memory.
• Are the same DTCs present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC CM, then go to the next step.
No
Go to the next step.
5
VERIFY THAT NO OTHER DTCS ARE PRESENT
• Are any other DTCs output?
Yes
Go to the applicable DTC inspection.
(See DTC Table.)
No
DTC troubleshooting completed.