DTC U1901, U2527 [DSC]

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DTC U1901, U2527 [DSC]

B3E040243000W27

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. (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 • Clear the DTCs from the memory. (See Clearing DTCs Procedures.) • Are the same DTCs present? | 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? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.