DTC U0151:00 [DYNAMIC STABILITY CONTROL (DSC)]

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

• Tire pressure monitoring system warning light* illuminates after flashes*².

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

*¹: Vehicles with Smart City Brake Support (SCBS), Mazda Radar Cruise Control (MRCC) and/or Smart Brake Support (SBS).

STEP	INSPECTION	ACTION
1	PERFORM SAS CONTROL MODULE DTC INSPECTION • Switch the ignition to off. • Using the M-MDS, perform the DTC inspection for the SAS control module. (See DTC INSPECTION.) • Are any DTCs detected?	Yes	Go to applicable DTC inspection. (See DTC TABLE.)
No	Go to the next step.
2	INSPECT SAS CONTROL MODULE SIGNAL (CAN2 LINE) FOR OPEN CIRCUIT • 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 SAS CONTROL MODULE SIGNAL (CAN2 LINE) FOR SHORT CIRCUIT • 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	VERIFY THAT THE SAME DTC IS NOT PRESENT • 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	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

PERFORM SAS CONTROL MODULE DTC INSPECTION

• Switch the ignition to off.

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

(See DTC INSPECTION.)

• Are any DTCs detected?

Yes

Go to applicable DTC inspection.

(See DTC TABLE.)

Go to the next step.

INSPECT SAS CONTROL MODULE SIGNAL (CAN2 LINE) FOR OPEN CIRCUIT

• 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.

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.

INSPECT SAS CONTROL MODULE SIGNAL (CAN2 LINE) FOR SHORT CIRCUIT

• 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

• 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.

Go to the next step.

VERIFY THAT THE SAME DTC IS NOT PRESENT

• 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.)

Go to the next step.

VERIFY THAT NO OTHER DTCS ARE PRESENT

• Are any other DTCs output?

Yes

Go to the applicable DTC inspection.

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

DTC troubleshooting completed.

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 light¹. • Tire pressure monitoring system warning light illuminates after flashes². • Inhibits the ABS, brake assist, TCS, Hill Launch Assist (HLA), vehicle roll prevention function², DSC, Mazda Radar Cruise Control (MRCC)², Smart Brake Support (SBS)², Smart City Brake Support (SCBS)², Secondary Collision Reduction (SCR)², and TPMS² controls. ¹: Vehicles with Smart City Brake Support (SCBS), Mazda Radar Cruise Control (MRCC) and/or Smart Brake Support (SBS). *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)