Pinpoint Test D : DTCS P188C, P188D

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

Refer to All Wheel Drive (AWD) for schematic and connector information.

Normal Operation and Fault Conditions

The AWD system uses data from other systems as inputs to the PCM. The PCM uses the inputs to determine the appropriate time to send a signal to the AWD relay module to energize the Active Torque Coupling (ATC) solenoid. The PCM communicates this signal on the AWDC or AWD Command circuit. The AWD relay module provides feedback on the AWDM or All wheel drive monitor circuit.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P188C:00	All Wheel Drive Relay Module Communication Circuit: No Sub Type Information	The AWD relay module did not receive a valid command from the PCM on the AWDC circuit.
PCM P188D:00	All Wheel Drive Relay Module Feedback Circuit: No Sub Type Information	The PCM did not receive a valid signal from the AWD Relay Module on the AWDM circuit.

Possible Sources

Wiring, terminals or connectors
AWD relay module
PCM

Visual Inspection and Pre-checks

VPWR fuse for AWD module

D1 CHECK THE AWD (ALL-WHEEL DRIVE) RELAY VOLTAGE CIRCUIT

NOTE: Fuse 9 (5A) protects multiple components. Check related systems that may be inoperative.

Ignition OFF.

Disconnect AWD Relay Module C3841.

Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3841-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to D2

No	VERIFY VPWR fuse for AWD module is OK. If OK, REPAIR the open circuit. If not OK, Refer to Charging System for schematic and connector information to identify possible causes of the circuit short. CLEAR the DTCs.

D2 CHECK THE AWD (ALL-WHEEL DRIVE) RELAY MODULE GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3841-1	Courtesy of FORD MOTOR COMPANY	C3841-4

Is the voltage greater than 11 volts?

Yes

GO to D3

No	REPAIR the circuit.

D3 CHECK THE AWD (ALL-WHEEL DRIVE) RELAY MODULE COMMAND AND FEEDBACK CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect the PCM C1915B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3841-6	Courtesy of FORD MOTOR COMPANY	Ground
C3841-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to D4

D4 CHECK THE AWD (ALL-WHEEL DRIVE) RELAY MODULE COMMAND AND FEEDBACK CIRCUITS FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3841-6	Courtesy of FORD MOTOR COMPANY	Ground
C3841-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to D5

No	REPAIR the circuit.

D5 CHECK THE AWD (ALL-WHEEL DRIVE) RELAY MODULE COMMAND AND FEEDBACK CIRCUITS FOR AN OPEN

Measure:

For 2.0L

Positive Lead	Measurement / Action	Negative Lead
C3841-6	Courtesy of FORD MOTOR COMPANY	C1915B-46
C3841-3	Courtesy of FORD MOTOR COMPANY	C1915B-60

Is the resistance less than 3 ohms?

Yes

GO to D6

No	REPAIR the circuit.

D6 CHECK THE AWD (ALL-WHEEL DRIVE) RELAY MODULE COMMAND AND FEEDBACK CIRCUITS FOR A SHORT TOGETHER

Measure.

Positive Lead	Measurement / Action	Negative Lead
C3841-6	Courtesy of FORD MOTOR COMPANY	C3841-3

Is the resistance greater than 10, 000 ohms?

Yes

GO to D7

No	REPAIR the Circuit.

D7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect all PCM and AWD Relay Module connectors.

Clear all DTCs

Perform PCMKOER Self Test.

Did DTC P188C or P188D reset?

Yes	For P188C, PCM Guided Routine Testing For P188D, INSTALL a new AWD Relay Module. Refer to: All-Wheel Drive (AWD) 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.