Pinpoint Test A : B1676

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 RECHECK THE ABS MODULE DTCs

Using a diagnostic scan tool, clear the ABS module DTCs.

Ignition OFF.

Ignition ON.

Test drive the vehicle at speeds above 6 km/h (4 mph).

Using a diagnostic scan tool, carry out the ABS module self-test.

Is DTC B1676 present?

Yes	GO to A2.
No	The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.

A2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

Using a diagnostic scan tool, retrieve all CMDTCs.

Is DTC B1317, B1318, B1676, U3003:16 or U3003:17 present in one or more modules AND are any charging system DTCs present in the PCM ?

Yes	DIAGNOSE the vehicle charging system. Refer to Diagnosis and Testing in Charging System .
No	GO to A3.

A3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

Carry out the Battery Condition Test. Refer to Diagnosis and Testing in Battery, Mounting and Cables .

Did the battery pass the condition test?

Yes	If the battery passed the condition test but required a recharge, DIAGNOSE the charging system. REFER to Diagnosis and Testing in Charging System . If the battery passed the condition test and did not require a recharge, GO to A4.
No	INSTALL a new battery. REFER to Battery, Mounting and Cables .

A4 CHECK CHARGING SYSTEM VOLTAGE

NOTE: Do not allow the engine speed to increase above 2, 000 rpm while carrying out this step or the generator can self excite and result in default charging system output voltage. If engine speed goes above 2, 000 rpm, shut the vehicle off and restart the engine before carrying out this step.

Start the engine.

Measure the voltage of the battery with and without a load on the charging system as follows:
- Turn off all accessories and run the engine at 1, 500 rpm for a minimum of 2 minutes while measuring battery voltage.
- Turn the headlights on and the HVAC fan on high and run engine at 1, 500 rpm for a minimum of 2 minutes while measuring battery voltage.

Are the voltages between 13 and 15.2 volts?

Yes	GO to A5.
No	DIAGNOSE the vehicle charging system. Refer to Diagnosis and Testing in Charging System .

A5 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect the battery negative cable. Refer to Battery, Mounting and Cables .

Disconnect ABS module C135 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C135-13	Courtesy of FORD MOTOR COMPANY	Ground
C135-38	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes	GO to A6.
No	REPAIR the circuit.

A6 CHECK FOR VOLTAGE AT THE ABS MODULE

Connect the battery negative cable. Refer to Battery, Mounting and Cables .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C135-1	Courtesy of FORD MOTOR COMPANY	Ground
C135-25	Courtesy of FORD MOTOR COMPANY	Ground
C135-35	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes	GO to A7.
No	VERIFY BJB fuses 52 (10A), 68 (30A) and 69 (60A) are OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

A7 CHECK FOR CORRECT ABS MODULE OPERATION

Ignition OFF.

Inspect ABS module C135 .

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect ABS module C135 . Make sure it seats and latches correctly.

Connect the battery negative cable. Refer to Battery, Mounting and Cables .

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module. Anti-Lock Brake System (ABS) Module .
No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.