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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

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CORRECTION 1. Check for latest level TCM software. Perform the TCM 1. Transmission adaptation/calibration. adaptation procedure. Refer to STANDARD PROCEDURE . 2. Check TCM for DTCs. Repair 2. Transmission in limp-home mode. as needed. 3. Check engine mounts, transmission mount, driveshaft couplings, rear crossmember 3. Driveline lash/movement. mounts, axle mounts and axle lash. Harsh N-D Engagement or 4. Perform converter clutch Harsh N-R Engagement diagnostics test. Inspect valve 4. Converter clutch or lock up control body for stuck or sticky lock up valve malfunction. control valve. If valve motion is free, replace lock up solenoid and retest. 5. Inspect valve body for stuck or 5. Valve Body Malfunction. sticky regulator valve. 6. Clutch or planetary component 6. Remove, disassemble and damage. repair transmission as necessary. 7. Perform TSB, recommend to 7. Water in Trans. split and clean VB if heavily contaminated. CONDITION POSSIBLE CAUSES

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Removal 1. Disconnect the battery ground cable. For additional information, refer to Section 414-01. 2. Drain the cooling system. For additional information, refer to Section 303-03. 3. Remove the camshaft position (CMP) sensor. For additional information, refer to Camshaft Position (CMP) Sensor in this section. 4. Disconnect the hose from the coolant pump outlet tube. 5. Remove the two (one shown) coolant pump outlet tube bolts and position the tube assembly aside. 6. Remove the accessory drive belt. Rotate the accessory drive belt tensioner counterclockwise. Push the spring clip toward the belt tensioner to lock the accessory drive belt tensioner in place. 7. NOTE: The bolt that is positioned under the power steering pressure tube fitting will remain with the pump. Remove the four power steering pump bolts and position the power steering pump aside. 8. CAUTION: Do not turn the crankshaft or the camshaft during the removal and installation procedure or the fuel system timing will be out of time with the engine and possibly cause engine damage. Rotate the crankshaft until the No. 1 cylinder is at top dead center (TDC) of the compression stroke. 9. Remove the bolt. 10. NOTE: The oil pump driveshaft might not come out with the camshaft synchronizer. If so, retrieve the oil pump drive shaft before proceeding. Remove the camshaft synchronizer. Installation CAUTION: After installation, do not loosen the synchronizer bolt and rotate the synchronizer assembly. The synchronizer assembly is not adjustable. Do not loosen the synchronizer bolt after the alignment tool has been removed in order to align the CMP electrical connector for any reason. If the electrical connector is not in the correct position, the synchronizer assembly must be removed, the alignment tool and the assembly reinstalled if the engine has not been rotated from TDC of the compression on the No. 1 cylinder. 1. CAUTION: A special tool must be used during the installation of the replacement synchronizer assembly. Failure to follow this procedure will result in the fuel system being out of time with the engine, possibly causing engine damage. Install the special tool on the camshaft synchronizer by rotating the tool until it engages the notch in the camshaft synchronizer housing and the armature. 2. CAUTION: It is very important to coat the gear on the camshaft synchronizer with clean engine oil prior to installation. Failure to do so could result in gear failure. NOTE: During installation, the arrow on the special tool will rotate clockwise until oil pump intermediate shaft and camshaft gear engages. Install the camshaft synchronizer housing assembly so the arrow on the special tool is 54 degrees from the centerline of the engine.

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NOTE: This procedure covers the removal and installation of the LH and RH front wheel driveshaft and joints. However, in the case of 1.8L engines, a halfshaft (3A329) is placed between the transaxle and the (outboard) front wheel driveshaft and joint (3B436) . For removal and installation procedures of either the two-piece RH front wheel driveshaft and joint assembly or the RH front wheel driveshaft and joint outboard half only, refer to the appropriate procedures in this section. Removal 1. Raise and support the vehicle. 2. Remove the lug nuts (1012) and the front wheel and tire assembly. 3. Remove the front fender splash shield bolts and the front fender splash shields (16103) . 4. Use a small cape chisel to carefully raise the staked portion of the front axle wheel hub retainer (3B477) . 5. Remove the front axle wheel hub retainer and discard it. 6. Remove the cotter pin and the tie rod end nut from the tie rod end (3A130) . Discard the cotter pin. 7. Use an appropriate tie rod end remover to separate the tie rod end from the front wheel knuckle (3K186) . 8. Remove the ball joint bolt and the ball joint bolt nut. 9. Carefully pry down on the front suspension lower arm (3078) to separate the front suspension lower arm ball joint (3050) from the front wheel knuckle . 10. Pull outward on the front wheel knuckle (3K185) . Carefully pull the front wheel driveshaft and joint from the front wheel knuckle and position it aside. 11. NOTE: Removal of the LH front wheel driveshaft and joint (3B437) requires removal of the rear engine support (6A023) to allow access with a pry bar. If the LH front wheel driveshaft and joint is being removed, continue with step 11. If the RH front wheel driveshaft and joint is being removed, continue with step 15. Support the transaxle with a transaxle jack or equivalent. 12. Remove the four transaxle mount-to-rear engine support nuts. 13. Remove the two rear engine support nuts at the rear of the rear engine support . 14. While supporting the rear of the rear engine support remove the two rear engine support bolts. Remove the rear engine support .

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Removal NOTE: Mark the pinion yoke and driveshaft to make sure the yoke and driveshaft are correctly aligned during assembly. 1. Remove the nuts and U-bolts connecting the driveshaft to the yoke. Disconnect the driveshaft from the yoke. Wire the driveshaft out of the way, so it will not interfere in the carrier removal process. 2. Remove both spindles and the Left and Right Shaft and U-joint assemblies as described in the Removal and Installation portion of this Section under Spindle and Left and Right Shaft and U-joint Assemblies. 3. Support the carrier with a suitable jack and remove the bolts retaining the carrier to the support arm. Separate the carrier from the support arm and drain the lubricant from the carrier. Remove the carrier from the vehicle. 4. Place the carrier in a Holding Fixture, T57L-500-B with Adapters T90T-4000-A. 5. Rotate the slip yoke and shaft assembly so the open side of the snap ring is exposed. Remove the snap ring from the shaft. 6. Remove the slip yoke and shaft assembly from the carrier. 7. Remove the oil seal and caged needle bearings at the same time, using Slide Hammer, T50T-100-A and Collet, D80L-100-A or equivalents. Discard the seal and needle bearing.