Pinpoint Test D : DTC P185D:00

WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Make sure the battery is fully charged before carrying out this pinpoint test.

D1 CHECK THE ABS MODULE WHEEL SPEED SENSOR PIDS

Enter the following diagnostic mode: ABS Module Datalogger.

While driving the vehicle at 30 km/h (18 mph), monitor the following wheel speed sensor PIDs:
- Left Front Wheel Speed Sensor (LF_WSPD)
- Left Rear Wheel Speed Sensor (LR_WSPD)
- Right Front Wheel Speed Sensor (RF_WSPD)
- Right Rear Wheel Speed Sensor (RR_WSPD)

Compare the speedometer reading to the wheel speed sensor PIDs.

Do the wheel speed sensor PIDs and speedometer speeds match within 1.5 km/h (1 mph)?

Yes

GO to D2

No	VERIFY that the 4 road wheels are the same size and have similar tread depth. CHECK the ABS for faults.

D2 CHECK RESISTANCE OF THE ELD FIELD COIL

Ignition OFF.

Disconnect ELD field coil.

Measure:

Positive Lead	Measurement / Action	Negative Lead
ELD field coil pin 1 component side	Courtesy of FORD MOTOR COMPANY	ELD field coil pin 2 component side

Is the resistance between 2-4 ohms?

Yes

GO to D3

No	INSTALL a new ELD field coil. REFER to: Differential Carrier - Vehicles With: Electronic Locking Differential (ELD) . REFER to: Differential Carrier - Vehicles With: Electronic Locking Differential (ELD) .

D3 CHECK THE ELD FIELD COIL GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
ELD field coil pin 2 component side	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

To repair the rear differential, Vehicles With: Ford 8.8 Inch Ring Gear, REFER to: Differential Carrier - Vehicles With: Electronic Locking Differential (ELD) . Vehicles With: Ford 9.75 Inch Ring Gear, REFER to: Differential Carrier - Vehicles With: Electronic Locking Differential (ELD) . CLEAR the DTCs.

No	REPAIR the circuit.