DTC

C1A90:12

ABS wheel-speed sensor power supply

C1A90:16

DETECTION CONDITION

• Malfunction detected in ABS wheel-speed sensor power supply voltage.

FAIL-SAFE FUNCTION

• Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)

POSSIBLE CAUSE

• Short to ground circuit in wiring harness between ABS wheel-speed sensor (LF) terminal B and DSC HU/CM terminal S

• Short to ground circuit in wiring harness between ABS wheel-speed sensor (RF) terminal B and DSC HU/CM terminal J

• Short to ground circuit in wiring harness between ABS wheel-speed sensor (LR) terminal A and DSC HU/CM terminal R

• Short to ground circuit in wiring harness between ABS wheel-speed sensor (RR) terminal A and DSC HU/CM terminal M

• Poor connection at each connector

• DSC HU/CM malfunction

Step

Inspection

Action

1

• Disconnect the ABS wheel-speed sensor connector.

• Inspect for continuity as followings:

• ABS wheel-speed sensor (LF) terminal B (wiring harness-side)—body ground

• ABS wheel-speed sensor (RF) terminal B (wiring harness-side)—body ground

• ABS wheel-speed sensor (LR) terminal A (wiring harness-side)—body ground

• ABS wheel-speed sensor (RR) terminal A (wiring harness-side)—body ground

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector in the followings:

• ABS wheel-speed sensor (LF) terminal B—DSC HU/CM terminal S

• ABS wheel-speed sensor (RF) terminal B—DSC HU/CM terminal J

• ABS wheel-speed sensor (LR) terminal A—DSC HU/CM terminal R

• ABS wheel-speed sensor (RR) terminal A—DSC HU/CM terminal M

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground circuit.

Go to Step3.

No

Go to the next step.

2

• Disconnect the ABS wheel-speed sensor connector.

• Disconnect the DSC HU/CM connector.

• Inspect for continuity as followings:

• ABS wheel-speed sensor (LF) terminal B (wiring harness-side)—DSC HU/CM terminal S (wiring harness-side)

• ABS wheel-speed sensor (RF) terminal B (wiring harness-side)—DSC HU/CM terminal J (wiring harness-side)

• ABS wheel-speed sensor (LR) terminal A (wiring harness-side)—DSC HU/CM terminal R (wiring harness-side)

• ABS wheel-speed sensor (RR) terminal A (wiring harness-side)—DSC HU/CM terminal M (wiring harness-side)

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector in the followings:

• ABS wheel-speed sensor (LF) terminal B—DSC HU/CM terminal S

• ABS wheel-speed sensor (RF) terminal B—DSC HU/CM terminal J

• ABS wheel-speed sensor (LR) terminal A—DSC HU/CM terminal R

• ABS wheel-speed sensor (RR) terminal A—DSC HU/CM terminal M

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to the next step.

3

• Using the M-MDS, clear the DTC from the DSC HU/CM.

  (See CLEARING DTC [DSC HU/CM].)

• Using the M-MDS, perform the DSC HU/CM DTC inspection.

  (See DTC INSPECTION [DSC HU/CM].)

• Is the same DTC present?

Yes

Repeat the inspection from Step1.

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.

4

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DSC HU/CM].)

No

DTC troubleshooting completed.