DTC

U0151:00

SAS control module system (CAN2 line malfunction)

DETECTION CONDITION

• Communication error with SAS control module is detected in CAN communication.

FAIL-SAFE FUNCTION

• Illuminates the ABS warning light, TCS/DSC indicator light, and master warning light*¹.

• Tire pressure monitoring system warning light* illuminates after flashes.

• Inhibits the ABS, brake assist, TCS, Hill Launch Assist (HLA), vehicle roll prevention function*², DSC, Mazda Radar Cruise Control (MRCC)*², Smart City Brake Support (SCBS)*², and TPMS controls.

*¹: Vehicles with Smart City Brake Support (SCBS).

*²: If equipped.

POSSIBLE CAUSE

• SAS control module malfunction

• Open or short circuit in the CAN2_H wiring harness between DSC HU/CM terminal G and SAS control module terminal 3H

• Open or short circuit in the CAN2_L wiring harness between DSC HU/CM terminal F and SAS control module terminal 3I

• DSC HU/CM malfunction

• Poor connection at connectors (female terminal)

STEP

INSPECTION

ACTION

1

• Switch the ignition off.

• Using the M-MDS, perform the DTC inspection for the SAS control module.

  (See DTC INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

  (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Are any DTCs detected?

Yes

Go to applicable DTC inspection.

(See DTC TABLE [STANDARD DEPLOYMENT CONTROL SYSTEM].)

(See DTC TABLE [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

No

Go to the next step.

2

• Disconnect the DSC HU/CM connector.

• Disconnect the SAS control module connectors.

• Inspect for continuity between the following DSC HU/CM connector terminals (vehicle harness-side) and SAS control module connector terminals (vehicle harness-side):

• DSC HU/CM terminal G—SAS control module terminal 3H

• DSC HU/CM terminal F—SAS control module terminal 3I

• 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 between the following DSC HU/CM connector terminals (vehicle harness-side) and SAS control module connector terminals (vehicle harness-side):

• DSC HU/CM terminal G—SAS control module terminal 3H

• DSC HU/CM terminal F—SAS control module terminal 3I

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 Step 4.

3

• Inspect for continuity between the following DSC HU/CM connector terminals (vehicle harness-side) and body ground:

• DSC HU/CM terminal G—body ground

• DSC HU/CM terminal F—body ground

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following DSC HU/CM connector terminals (vehicle harness-side) and SAS control module connector terminals (vehicle harness-side):

• DSC HU/CM terminal G—SAS control module terminal 3H

• DSC HU/CM terminal F—SAS control module terminal 3I

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.

• Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to next step.

No

Go to the next step.

4

• Reconnect all disconnected connectors.

• Clear the DTCs from the memory.

  (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

• Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more.

• 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

• Are any other DTCs output?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

No

DTC troubleshooting completed.