DTC U3003:16/U3003:17 [ANTILOCK BRAKE SYSTEM (ABS)]

id0402b0877800

DTC

U3003:16, U3003:17

Power supply system

DETECTION CONDITION

•  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

•  U3003:16

―  Illuminates the ABS warning light.

―  Does not illuminate the brake warning light.^*1

―  Illuminates the brake warning light.^*2*3

―  Inhibits the ABS control.

―  Permits the EBD control.^*1

―  Inhibits the EBD control.^*2*3

•  U3003:17

―  Illuminates the ABS warning light and brake system warning light.

―  Inhibits the ABS and EBD controls.

^*1: When power supply voltage is 7.9—9.6 V for 700 ms or more.

^*2: When power supply voltage is 6.0—7.9 V for 780 ms or more.

^*3: When power supply voltage is below 6 V for 50 ms or more.

POSSIBLE CAUSE

•  Battery deterioration

•  Generator malfunction

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

•  Open or short circuit in wiring harness between ABS HU/CM terminal N and battery

•  Open or short circuit in wiring harness between ABS HU/CM terminal Y and battery

•  Open circuit in wiring harness between ABS HU/CM terminal B 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 REMOVAL/INSTALLATION [MZR 1.6].)
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].)
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 DRIVE BELT REMOVAL/INSTALLATION [MZR 1.6].) Go to Step 7.
4	INSPECT FUSE CONDITION • Inspect the following fuses. ― SRS1 7.5A ― 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 ABS HU/CM POWER SUPPLY FOR OPEN CIRCUIT • Disconnect the ABS HU/CM connectors. • Switch the ignition ON (engine off). • Measure the voltage between following connector terminals of the ABS HU/CM (vehicle harness-side) and body ground: ― ABS HU/CM: N—Body ground ― ABS HU/CM: Y—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 ABS HU/CM (vehicle harness-side) and positive battery terminal: ― ABS HU/CM: N—Positive battery terminal ― ABS HU/CM: Y—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 ABS HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT • Switch the ignition to off. • Measure the resistance between the ABS HU/CM terminal B (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 ABS HU/CM terminal B 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 ABS HU/CM terminal B 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 [ANTILOCK BRAKE SYSTEM (ABS)].) • 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 [ANTILOCK BRAKE SYSTEM (ABS)].)
8		No	DTC troubleshooting completed.

DTC	U3003:16, U3003:17		Power supply system
DETECTION CONDITION		• 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		• U3003:16 ― Illuminates the ABS warning light. ― Does not illuminate the brake warning light.^1 ― Illuminates the brake warning light.^23 ― Inhibits the ABS control. ― Permits the EBD control.^1 ― Inhibits the EBD control.^23 • U3003:17 ― Illuminates the ABS warning light and brake system warning light. ― Inhibits the ABS and EBD controls. ^1: When power supply voltage is 7.9—9.6 V for 700 ms or more. ^2: When power supply voltage is 6.0—7.9 V for 780 ms or more. ^*3: When power supply voltage is below 6 V for 50 ms or more.
POSSIBLE CAUSE		• Battery deterioration • Generator malfunction • Fuse (SRS1 7.5A, ABS/DSCM 50A) malfunction • Open or short circuit in wiring harness between ABS HU/CM terminal N and battery • Open or short circuit in wiring harness between ABS HU/CM terminal Y and battery • Open circuit in wiring harness between ABS HU/CM terminal B and body ground • Poor connection at connectors (female terminal)