DTC U3003-08; U3003-16; U3003-17; Power Supply System: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

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 and smart city brake support (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, hill launch assist (HLA), TPMS ^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, and smart city brake support (SCBS) indicator light (amber) ^1 . Tire pressure monitoring system warning light ^1 illuminates after flashes. Inhibits the ABS, EBD, TCS, DSC, brake assist control, hill launch assist (HLA), TPMS ^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 (MAIN 200 A, SRS1 7.5A, ABS/DSCS 30A, A BS/DSCM 50A) malfunction Open or short circuit in wiring harness between DSC HU/CM terminal A and batte ry Open or short circuit in wiring harness between DSC HU/CM terminal B and batte ry Open or short circuit in wiring harness between DSC HU/CM termi nal Q and batte ry Open circuit in wiring harness between DSC HU/CM terminal AL and body ground Poor connection at connectors (female terminal)