2005 Ford Freestyle/ Five Hundred/ Montego Differential Electronic Module (DEM) DIAGNOSIS AND TESTING
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Principles of Operation Differential Electronic Module (DEM) and Active On-Demand Coupling The main role of the active on-demand coupling and the differential electronic module (DEM) is to regulate the all wheel drive (AWD) function by distributing torque between the front and rear axles. The system consists of a coupling that combines mechanical, hydraulic and electronic sections. The coupling unit is attached to the rear axle, between the differential gear and the driveshaft. The mechanical and hydraulic sections are driven by the driveshaft. Active on-demand coupling (AOC) has the following characteristics: Permanent AWD with electronic control of torque transfer front to rear 4X4 control module integrated into the DEM Similar to four wheel drive (4WD) operation No driveline wind-up during slow speed maneuvers or parking The system is not sensitive to size differences between the 4 road tires (when driving with a spare wheel, for example). The system is not sensitive to being towed with one axle raised. Inspection and Verification — Electronic Shift 1. Visually inspect for the following obvious signs of mechanical and electrical damage. Visual Inspection Chart Mechanical Axle shafts and universal joints Driveshaft and universal joints Rear differential Differential electronic module (DEM) Fluid leaks Matching tire size 2. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position. 3. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual. 4. Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with: CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00. NO RESP/NOT EQUIP for DEM, GO to Pinpoint Test A. SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the anti-lock brake system (ABS) module self-test. Carry out one key cycle after clearing codes. 5. If the DTCs retrieved are related to the concern, go to the 4X4 Control Module (DEM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. 6. NOTE: Not all DTCs cause the traction control indicator to illuminate. Refer to the table for specific DTCs. When the 4X4 control module (DEM) detects certain types of faults in the AWD system, a DTC is set and the traction control indicator will stay illuminated until the condition has been repaired and the DTCs are cleared using the scan tool. Carry out one key cycle after clearing codes. DTC P0562 System Voltage Low P0563 System Voltage High P0602 Powertrain Control Module (PCM) Programming Error P0606 ECM/PCM Processor Electrical Smart junction box (SJB) mini-fuse 19 (10A) Differential electronic module (DEM) Wiring harness Connector(s) Circuitry Description Traction Control Indicator State OFF OFF ON ON
Principles of Operation Differential Electronic Module (DEM) and Active On-Demand Coupling The main role of the active on-demand coupling and the differential electronic module (DEM) is to regulate the all wheel drive (AWD) function by distributing torque between the front and rear axles. The system consists of a coupling that combines mechanical, hydraulic and electronic sections. The coupling unit is attached to the rear axle, between the differential gear and the driveshaft. The mechanical and hydraulic sections are driven by the driveshaft. Active on-demand coupling (AOC) has the following characteristics: Permanent AWD with electronic control of torque transfer front to rear 4X4 control module integrated into the DEM Similar to four wheel drive (4WD) operation No driveline wind-up during slow speed maneuvers or parking The system is not sensitive to size differences between the 4 road tires (when driving with a spare wheel, for example). The system is not sensitive to being towed with one axle raised. Inspection and Verification — Electronic Shift 1. Visually inspect for the following obvious signs of mechanical and electrical damage. Visual Inspection Chart Mechanical Axle shafts and universal joints Driveshaft and universal joints Rear differential Differential electronic module (DEM) Fluid leaks Matching tire size 2. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position. 3. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual. 4. Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with: CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00. NO RESP/NOT EQUIP for DEM, GO to Pinpoint Test A. SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the anti-lock brake system (ABS) module self-test. Carry out one key cycle after clearing codes. 5. If the DTCs retrieved are related to the concern, go to the 4X4 Control Module (DEM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. 6. NOTE: Not all DTCs cause the traction control indicator to illuminate. Refer to the table for specific DTCs. When the 4X4 control module (DEM) detects certain types of faults in the AWD system, a DTC is set and the traction control indicator will stay illuminated until the condition has been repaired and the DTCs are cleared using the scan tool. Carry out one key cycle after clearing codes. DTC P0562 System Voltage Low P0563 System Voltage High P0602 Powertrain Control Module (PCM) Programming Error P0606 ECM/PCM Processor Electrical Smart junction box (SJB) mini-fuse 19 (10A) Differential electronic module (DEM) Wiring harness Connector(s) Circuitry Description Traction Control Indicator State OFF OFF ON ON
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