Operation CHARM: Car repair manuals for everyone.
Home >> Mercury >> 2011 >> Milan AWD V6-3.0L >> Repair and Diagnosis >> Transmission and Drivetrain >> Transfer Case >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test D: DTCs P1824 and P1825

Pinpoint Test D: DTCs P1824 and P1825




Four Wheel Drive (4WD) Systems

Pinpoint Test D: DTCs P1824 and P1825

Refer to Wiring Diagram Set 34 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), All Wheel Drive (AWD) for schematic and connector information. Diagrams By Number

Normal Operation

The All-Wheel Drive (AWD) system uses data from other systems as inputs to the 4X4 control module. The 4X4 control module uses the inputs to determine the appropriate duty cycle to send to the Active Torque Coupling (ATC) solenoid (part of rear axle) that delivers the desired torque to the rear wheels. If the 4X4 control module loses communication with, or receives invalid data from any of the necessary modules, DTCs are set and the 4X4 control module may not allow Four-Wheel Drive (4WD) operation.

- DTC P1824 4-Wheel Drive Clutch Relay Circuit Failure - When the 4X4 control module detects a short to ground on the ATC solenoid feedback circuit, this DTC is set.
- DTC P1825 4-Wheel Drive Clutch Relay Open Circuit - When the 4X4 control module detects an open or short to ground on the ATC solenoid command or feedback circuit for more than 2 seconds, this DTC is set.

This pinpoint test is intended to diagnose the following:
- Tire/axle out of range
- Wiring, terminals or connectors
- ATC solenoid (part of rear axle)
- 4X4 control module
- Power Transfer Unit (PTU)


PINPOINT TEST D: DTCs P1824 AND P1825

NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Inspection and Verification

-------------------------------------------------
D1 CHECK FOR 4X4 CONTROL MODULE DTCs

- Ignition ON.
- Carry out the 4X4 control module self-test.
- Are any DTCs received?

Yes
For DTC P1824 or P1825, GO to D2.

For all other DTCs, REFER to the 4X4 Control Module DTC Chart. Diagnostic Trouble Code Tests and Associated Procedures

No
GO to D2.

-------------------------------------------------
D2 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH ATC SOLENOID (PART OF REAR AXLE) CONNECTED

- Ignition OFF.
- Disconnect: 4X4 Control Module C3253 .
- Measure the resistance between 4X4 control module C3253-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C3253-16, circuit RCF21 (WH/VT), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to D5.

No
GO to D3.

-------------------------------------------------
D3 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH C3051 DISCONNECTED

- Disconnect: ATC Solenoid Jumper Harness C3051 .
- Measure the resistance between 4X4 control module C3253-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C3253-16, circuit RCF21 (WH/VT), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to D4.

No
REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
D4 CHECKING THE ATC SOLENOID JUMPER HARNESS

NOTICE: The Active Torque Coupling (ATC) solenoid jumper harness must be secured to prevent damage to the wiring.

- Disconnect: ATC Solenoid C3254 .
- Inspect the ATC solenoid jumper harness for damage.
- Is the ATC solenoid jumper harness damaged?

Yes
REPAIR or INSTALL a new ATC solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new rear axle assembly. REFER to Rear Drive Axle/Differential Service and Repair. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
D5 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN WITH ATC SOLENOID CONNECTED

- Connect: ATC Solenoid C3254 and ATC Solenoid Jumper Harness C3051 .
- Measure the resistance between 4X4 control module C3253-8, circuit CCF21 (VT/WH), harness side and 4X4 control module C3253-16, circuit RCF21 (WH/VT), harness side.




- Is the resistance less than 10 ohms?

Yes
GO to D8.

No
GO to D6.

-------------------------------------------------
D6 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN AT C3051

- Disconnect: ATC Solenoid Jumper Harness C3051 .
- Measure the resistance between 4X4 control module C3253-8, circuit CCF21 (VT/WH), harness side and ATC solenoid jumper harness C3051-1, circuit CCF21 (VT/WH).




- Repeat this measurement while wiggling the harness.
- Measure the resistance between 4X4 control module C3253-16, circuit RCF21 (WH/VT), harness side and ATC solenoid jumper harness C3051-2, circuit RCF21 (WH/VT), harness side.




- Repeat this measurement while wiggling the harness.
- Are the resistances less than 5 ohms?

Yes
GO to D7.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
D7 CHECK THE ATC SOLENOID CIRCUIT FOR AN INTERNAL OPEN

NOTICE: The Active Torque Coupling (ATC) solenoid jumper harness must be secured to prevent damage to the wiring.

- Disconnect: ATC Solenoid C3254 .
- Measure the resistance between ATC solenoid C3254-1, circuit CCF21 (VT/WH), component side, and ATC solenoid C3254-2, circuit RCF21 (WH/VT), component side.




- Repeat this measurement while wiggling the harness.
- Is the resistance less than 10 ohms?

Yes
REPAIR or INSTALL a new ATC solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new rear axle assembly. REFER to Rear Drive Axle/Differential Service and Repair. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
D8 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN

- Measure the resistance between 4X4 control module C3253-15, circuit GD126 (BK/WH), harness side and ground.




- Repeat this measurement while wiggling the harness.
- Is the resistance less than 5 ohms?

Yes
GO to D9.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
D9 CHECK THE 4X4 CONTROL MODULE POWER CIRCUITS

- Ignition ON.
- Measure the voltage between 4X4 control module C3253-4, circuit CBP35 (YE/GY), harness side and ground; and between 4X4 control module C3253-5, circuit SBP11 (BU/RD), harness side and ground.




- Are the voltages greater than 10 volts?

Yes
GO to D10.

No
VERIFY the Smart Junction Box (SJB) fuse(s) 11 (10A) and 35 (10A) are OK. If fuse(s) are OK, REPAIR the circuit in question. If SJB fuse(s) are not OK, Refer to the Wiring Diagrams to identify possible causes of the circuit short. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs). REPEAT the self-test. Diagrams By Number

-------------------------------------------------
D10 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION

- Disconnect: 4X4 Control Module C3253 .
- Check the harness and component side connectors for:
- corrosion.
- pushed-out/bent pins.
- Check the ATC solenoid jumper harness between the 4X4 control module and the ATC solenoid, located on the rear subframe.
- Connect the 4X4 control module and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new 4X4 control module. REFER to 4X4 Control Module Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------

pro multis · About Operation CHARM