DTC B1676 [L3]


DTC	B1676		Power supply system
DETECTION CONDITION		• Abnormal high voltage (18 V or more) for ignition voltage is detected. • Abnormal low voltage (10 V or less) for ignition voltage is detected.
POSSIBLE CAUSE		• Malfunctioning fuse ABS 60A, ABS 25A, or ABS/ASC 5A • Open or short circuit in the wiring harness between ABS HU/CM terminal AK and battery • Open or short circuit in wiring harness between ABS HU/CM terminal AU and battery • Open or short circuit in wiring harness between ABS HU/CM terminal AT and battery • Open circuit in wiring harness between ABS HU/CM terminal A and body ground • Open circuit in the wiring harness between ABS HU/CM terminal B and body ground • Battery deterioration • Generator malfunction • Poor connection at connectors (female terminal)


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 6. (See BATTERY RECHARGING [L3, AJ (3.0L Duratec)].) (See BATTERY REMOVAL/INSTALLATION [L3, AJ (3.0L Duratec)].)
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 6. (See BATTERY REMOVAL/INSTALLATION [L3, AJ (3.0L Duratec)].)
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 [L3 R.H.D.].) (See DRIVE BELT REPLACEMENT [L3].)
4	INSPECT ABS HU/CM POWER SUPPLY FOR OPEN CIRCUIT • Disconnect the ABS HU/CM connectors. • Turn the ignition switch to the ON position. • Measure the voltage between following connector terminals of the ABS HU/CM (vehicle harness-side) and body ground: - ABS HU/CM: AT-Body ground - ABS HU/CM: AU-Body ground - ABS HU/CM: AK-Body ground • Is the voltage 10 V or more?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness, then go to Step 6.
5	INSPECT ABS HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT • Turn the ignition switch off. • Measure the resistance between following connector terminal of ABS HU/CM (vehicle harness-side) and body ground: - ABS HU/CM: A-Body ground - ABS HU/CM: B-Body ground • Is the resistance within 0-1 ohm?	Yes	Go to the next step.
5		No	If there is open circuit: • Repair or replace the wiring harness, then go to the next step. If resistance is not within specification: • Repair or replace the poor ground part, then go to the next step.
6	VERIFY THAT THE SAME DTC IS NOT PRESENT • Reconnect all disconnected connectors. • Clear the DTCs from the memory. (See Clearing DTCs Procedures.) • Start the engine and drive the vehicle at 20 km/h {12.4 mph} or more. • Are the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the ABS HU/CM, then go to the next step. (See ABS HU REMOVAL/INSTALLATION)
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See DTC Table.)
7		No	DTC troubleshooting completed.