PINPOINT TEST D: DTCs P1824/P1825 - 4-WHEEL DRIVE CLUTCH RELAY CIRCUIT FAILURE/4-WHEEL DRIVE CLUTCH RELAY OPEN CIRCUIT

WARNING: This page is about a different variant/trim than selected.

NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Refer to INSPECTION AND VERIFICATION in this service information.

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 in this service information.
- NO: GO to D2 .
D2 CHECK THE SOLENOID AND CIRCUITRY FOR A SHORT TO VOLTAGE WHILE DISCONNECTED FROM THE MODULE
- Disconnect: 4X4 Control Module C3184.
- Measure for voltage between the 4X4 control module C3184-8, circuit CCF21 (VT/WH), harness side and ground; and between the 4X4 control module C3184-16, circuit RCF21 (WH/RD), harness side and ground.
  
  Fig 1: Checking Solenoid And Circuitry For Short To Voltage While Disconnected From Module
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
  - YES: REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
  - NO: GO to D3 .
D3 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 C3184.
- Measure resistance between the 4X4 control module C3184-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C3184-16, circuit RCF21 (WH/RD), harness side and ground.
  
  Fig 2: Checking Circuits CCF21 (VT/WH) And RCF21 (WH/VT) For Short To Ground With ATC Solenoid (Part Of Rear Axle) Connected
  Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
  - YES: GO to D5 .
  - NO: GO to D4 .
D4 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH C4347 DISCONNECTED
- Disconnect: ATC Solenoid C4347.
- Measure resistance between the 4X4 control module C3184-8, circuit CCF21 (VT/WH), harness side and ground; and between the 4X4 control module C3184-16, circuit RCF21 (WH/RD), harness side and ground.
  
  Fig 3: Checking Circuits CCF21 (VT/WH) And RCF21 (WH/VT) For Short To Ground With C4347 Disconnected
  Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
  - YES: INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE & DIFFERENTIAL - FORD 8.8-INCH RING GEAR article. CLEAR the DTCs. REPEAT the self-test.
  - NO: REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
D5 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN AT C4347
- Disconnect: ATC Solenoid C4347.
- Measure resistance between the 4X4 control module C3184-8, circuit CCF21 (VT/WH), harness side and the ATC solenoid C4347-1, circuit CCF21 (VT/WH), harness side.
  
  Fig 4: Checking Circuits CCF21 (VT/WH) And RCF21 (WH/VT) For Open C4347
  Courtesy of FORD MOTOR CO.
- Repeat this measurement while wiggling the harness.
- Measure resistance between the 4X4 control module C3184-16, circuit RCF21 (WH/RD), harness side and the ATC solenoid C4347-2, circuit RCF21 (WH/RD), harness side.
  
  Fig 5: Checking Circuits CCF21 (VT/WH) And RCF21 (WH/VT) For Open C4347
  Courtesy of FORD MOTOR CO.
- Repeat this measurement while wiggling the harness.
- Are the resistances less than 5 ohms?
  - YES: GO to D6 .
  - NO: REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
D6 CHECK THE ATC SOLENOID CIRCUIT FOR AN INTERNAL OPEN
- Measure the resistance between ATC solenoid C4347-1, circuit CCF21 (VT/WH), component side, and ATC solenoid C4347-2, circuit RCF21 (WH/RD), component side.
  
  Fig 6: Checking ATC Solenoid Circuit For Internal Open
  Courtesy of FORD MOTOR CO.
- Repeat this measurement while wiggling the harness.
- Is the resistance between 2 and 5 ohms?
  - YES: GO to D7 .
  - NO: INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE & DIFFERENTIAL - FORD 8.8-INCH RING GEAR article. CLEAR the DTCs. REPEAT the self-test.
D7 CHECK CIRCUIT GD182 (BK/GY) FOR AN OPEN
- Measure the resistance between 4X4 control module C3184-15, circuit GD182 (BK/GY), harness side and ground.
  
  Fig 7: Measuring Resistance Between 4X4 Control Module C3184-15, Circuit GD182 (BK/GY), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Repeat this measurement while wiggling the harness.
- Is the resistance less than 5 ohms?
  - YES: GO to D8 .
  - NO: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
D8 CHECK THE 4X4 CONTROL MODULE POWER CIRCUITS
- Ignition ON.
- Measure the voltage between 4X4 control module C3184-5, circuit SBP11 (BU/RD), harness side and ground; and between 4X4 control module C3184-4, circuit CBP35 (YE/GY), harness side and ground.
  
  Fig 8: Checking 4X4 Control Module Power Circuits
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
  - YES: GO to D9 .
  - NO: CHECK Smart Junction Box (SJB) fuses 11 (10A) and 35 (10A). REPAIR the circuit in question for open or short to ground. CLEAR the DTCs. REPEAT the self-test.
D9 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION
- Disconnect: 4X4 Control Module C3184.
- Check the harness and component side connectors for:
  - corrosion.
  - pushed-out/bent pins.
- Check 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 in this service information. 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.