DTC U3003:08/U3003:16/U3003:17 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2902000

DTC

U3003:08, U3003:16, U3003:17

Power supply system

DETECTION CONDITION

•  U3003:08

―  While the vehicle is traveling at a speed of 10km/h {6.2 mph} or more, a CAN signal error caused by low power supply voltage is detected.

•  U3003:16

―  Low ignition voltage (7.9—9.6 V) is detected at the voltage monitor of the solenoid valve or motor monitor. (Except engine cranking condition)

―  Low ignition voltage (6.0—7.9 V) is detected at the voltage monitor of the solenoid valve or motor monitor.

―  Low ignition voltage (below 6.0 V) is detected at the voltage monitor of the solenoid valve or motor monitor.

•  U3003:17

―  High ignition voltage (17 V or more) is detected at the voltage monitor of the solenoid valve or motor monitor.

FAIL-SAFE FUNCTION

•  U3003:08

―  Permits the control and does not illuminate each warning/indicator light.

•  U3003:16

―  Illuminates the ABS warning light, TCS/DSC indicator light, Mazda Radar Cruise Control (MRCC) warning light^*1, and Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber)^*1.

―  Does not illuminate the brake warning light.^*2

―  Illuminates the brake warning light.^*3*4

―  Tire pressure monitoring system warning light^*1 illuminates after flashes.

―  Inhibits the ABS, TCS, DSC, brake assist control, vehicle roll prevention function^*1, Hill Launch Assist (HLA), TPMS^*1, Secondary Collision Reduction (SCR)^*1, Mazda Radar Cruise Control (MRCC)^*1, Smart Brake Support (SBS)^*1, and Smart City Brake Support (SCBS)^*1 controls.

―  Permits the EBD control.^*2

―  Inhibits the EBD control.^*3*4

•  U3003:17

―  Illuminates the ABS warning light, brake system warning light, TCS/DSC indicator light, Mazda Radar Cruise Control (MRCC) warning light^*1, and Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber)^*1.

―  Tire pressure monitoring system warning light^*1 illuminates after flashes.

―  Inhibits the ABS, EBD, TCS, DSC, brake assist control, vehicle roll prevention function^*1, Hill Launch Assist (HLA), TPMS^*1, Secondary Collision Reduction (SCR)^*1, Mazda Radar Cruise Control (MRCC)^*1, Smart Brake Support (SBS)^*1, and Smart City Brake Support (SCBS)^*1, controls.

^*1: If equipped.

^*2: When power supply voltage is 7.9—9.6 V for 700 ms or more.

^*3: When power supply voltage is 6.0—7.9 V for 780 ms or more.

^*4: When power supply voltage is below 6 V for 50 ms or more.

POSSIBLE CAUSE

•  Battery deterioration

•  Generator malfunction

•  Fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 50A) malfunction

•  Open or short circuit in wiring harness between DSC HU/CM terminal A and battery

•  Open or short circuit in wiring harness between DSC HU/CM terminal B and battery

•  Open or short circuit in wiring harness between DSC HU/CM terminal Q and battery

•  Open circuit in wiring harness between DSC HU/CM terminal AL and body ground

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT BATTERY VOLTAGE • Is the battery positive terminal voltage normal?	Yes	Inspect for normal connection of the battery terminals. Go to the next step.
1		No	Charge or replace the battery, then go to Step 7. (See BATTERY RECHARGING [MZR 1.6].) (See BATTERY RECHARGING [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY RECHARGING [SKYACTIV-D 1.5].) (See BATTERY RECHARGING [SKYACTIV-D 2.2].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.6].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
2	INSPECT BATTERY GRAVITY • Is battery specific gravity as specified?	Yes	Go to the next step.
2		No	Replace the battery, then go to Step 7. (See BATTERY REMOVAL/INSTALLATION [MZR 1.6].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
3	INSPECT CHARGING SYSTEM • Are the generator and the drive belt tensions normal?	Yes	Go to the next step.
3		No	Replace the generator and/or drive belt if necessary. (See GENERATOR REMOVAL/INSTALLATION [MZR 1.6].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITH i-ELOOP)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2 (WITHOUT i-ELOOP)].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2 (WITH i-ELOOP)].) (See DRIVE BELT REMOVAL/INSTALLATION [MZR 1.6].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to Step 7.
4	INSPECT FUSE CONDITION • Inspect the following fuses. ― SRS1 7.5A ― ABS/DSCS 30A ― ABS/DSCM 50A • Is the fuse normal?	Yes	Go to the next step.
4		No	Replace the fuse, then go to Step 7.
5	INSPECT DSC HU/CM POWER SUPPLY FOR OPEN CIRCUIT • Disconnect the DSC HU/CM connectors. • Switch the ignition ON (engine off). • Measure the voltage between following connector terminals of the DSC HU/CM (vehicle harness-side) and body ground: ― DSC HU/CM: A—Body ground ― DSC HU/CM: B—Body ground ― DSC HU/CM: Q—Body ground • Is the voltage 10 V or more?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between following connector terminals of the DSC HU/CM (vehicle harness-side) and positive battery terminal: ― DSC HU/CM: A—Positive battery terminal ― DSC HU/CM: B—Positive battery terminal ― DSC HU/CM: Q—Positive battery terminal 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 7.
6	INSPECT DSC HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT • Switch the ignition to off. • Measure the resistance between the DSC HU/CM terminal AL (vehicle harness-side) and body ground. • Is the resistance within 0—1 ohm?	Yes	Go to the next step.
6		No	• If there is open circuit: ― Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and the body ground. 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. • If resistance is not within specification: ― Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and the body ground. 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 poor ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the poor ground part. ― Go to the next step.
7	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 20 km/h {12 mph} or more. • Are the same DTCs present?	Yes	Repeat the inspection from Step 1.
7		No	Go to the next step.
8	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)].)
8		No	DTC troubleshooting completed.

DTC	U3003:08, U3003:16, U3003:17		Power supply system
DETECTION CONDITION		• U3003:08 ― While the vehicle is traveling at a speed of 10km/h {6.2 mph} or more, a CAN signal error caused by low power supply voltage is detected. • U3003:16 ― Low ignition voltage (7.9—9.6 V) is detected at the voltage monitor of the solenoid valve or motor monitor. (Except engine cranking condition) ― Low ignition voltage (6.0—7.9 V) is detected at the voltage monitor of the solenoid valve or motor monitor. ― Low ignition voltage (below 6.0 V) is detected at the voltage monitor of the solenoid valve or motor monitor. • U3003:17 ― High ignition voltage (17 V or more) is detected at the voltage monitor of the solenoid valve or motor monitor.
FAIL-SAFE FUNCTION		• U3003:08 ― Permits the control and does not illuminate each warning/indicator light. • U3003:16 ― Illuminates the ABS warning light, TCS/DSC indicator light, Mazda Radar Cruise Control (MRCC) warning light^1, and Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber)^1. ― Does not illuminate the brake warning light.^2 ― Illuminates the brake warning light.^34 ― Tire pressure monitoring system warning light^1 illuminates after flashes. ― Inhibits the ABS, TCS, DSC, brake assist control, vehicle roll prevention function^1, Hill Launch Assist (HLA), TPMS^1, Secondary Collision Reduction (SCR)^1, Mazda Radar Cruise Control (MRCC)^1, Smart Brake Support (SBS)^1, and Smart City Brake Support (SCBS)^1 controls. ― Permits the EBD control.^2 ― Inhibits the EBD control.^34 • U3003:17 ― Illuminates the ABS warning light, brake system warning light, TCS/DSC indicator light, Mazda Radar Cruise Control (MRCC) warning light^1, and Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber)^1. ― Tire pressure monitoring system warning light^1 illuminates after flashes. ― Inhibits the ABS, EBD, TCS, DSC, brake assist control, vehicle roll prevention function^1, Hill Launch Assist (HLA), TPMS^1, Secondary Collision Reduction (SCR)^1, Mazda Radar Cruise Control (MRCC)^1, Smart Brake Support (SBS)^1, and Smart City Brake Support (SCBS)^1, controls. ^1: If equipped. ^2: When power supply voltage is 7.9—9.6 V for 700 ms or more. ^3: When power supply voltage is 6.0—7.9 V for 780 ms or more. ^4: When power supply voltage is below 6 V for 50 ms or more.
POSSIBLE CAUSE		• Battery deterioration • Generator malfunction • Fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 50A) malfunction • Open or short circuit in wiring harness between DSC HU/CM terminal A and battery • Open or short circuit in wiring harness between DSC HU/CM terminal B and battery • Open or short circuit in wiring harness between DSC HU/CM terminal Q and battery • Open circuit in wiring harness between DSC HU/CM terminal AL and body ground • Poor connection at connectors (female terminal)