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NOTE: To engage Automatic Disconnecting Differential (ADD) actuator, vehicle speed must be 62 mph (100 km/h) or less. Also, do not attempt to shift into or out of 4WD while wheels are slipping. Always stop wheel spin first to avoid damaging 4WD components.
4WD operation can be controlled by transfer case shift lever and 2-4 selector switch mounted on shifter. With transfer shifter in "H2-H4" position, selector switch can be used to lock ADD actuator. This can be used on all types of road surfaces, and will increase traction over conventional 2WD setting.
NOTE: "L4 L " (low range 4WD - locked) and "H4 L " (high range 4WD - locked) settings are not to be used on dry paved surfaces, as drive system and locking mechanism can be damaged as a result. Before shifting to "H4 L ", reduce vehicle speed to 62 mph (100 km/h) or less. Before shifting to "L4 L ", bring vehicle to a complete stop and place transmission in neutral.
"H4 L " setting is used for increased traction when wheel slipping still occurs in "H2-H4" position. This setting will lock both the center differential and ADD actuator for front wheels, regardless of 2-4 selector switch position.
"L4 L " setting offers maximum power and traction for hard pulling in situations that vehicle cannot negotiate even in "H4 L " mode.
AUTOMATIC DISCONNECTING DIFFERENTIAL ACTUATOR
Automatic Disconnecting Differential (ADD) allows engagement of front differential from 2WD to 4WD while vehicle is moving. On vehicles with ADD, a flange is mounted on front hub which is splined onto axle shaft connected to side gear shaft on front differential. Locking hubs are not used with ADD.
When transfer case is shifted into or out of 4WD, ADD is controlled by operation of 2 ADD solenoids that direct vacuum to appropriate actuator diaphragm. ADD actuator engages clutch sleeve with intermediate shaft in front differential and side gear shaft, providing 4WD operation. When vehicle is in 4WD, an indicator light on instrument panel will be illuminated.
PARK/NEUTRAL POSITION SWITCH
Park/Neutral Position (PNP) switch delivers an input signal to ECM indicating transmission gearshift lever position. Switch is located on side of transmission.
2-4 SELECT SWITCH
2-4 select switch sends a request signal to 4WD ECU, which activates corresponding actuator vacuum switching valve. Switch is located on transfer case shift lever knob.
TRANSFER SHIFT ACTUATOR ASSEMBLY
Transfer shift actuator assembly shifts transfer case from one configuration to another from signals sent by 4WD ECU.
VEHICLE SPEED SENSOR
Vehicle speed sensor (VSS) signal is generated by sensor mounted in transmission extension housing. Additionally, on ABS-equipped vehicles, ABS wheel speed sensors send signals to ABS ECU, which then converts them to a 4-pulse signal. On all models, signals are then delivered to instrument cluster, where they are converted into a more precise rectangular waveform. VSS signal is then sent to various control modules, including 4WD ECU. Signal is used to prevent shifting into 4WD above 62 miles per hour.
L4 POSITION SWITCH
The L4 position switch sends a signal to 4WD ECU when transfer case gear position is L4 L .
4WD ELECTRONIC CONTROL UNIT
4WD electronic control unit monitors all inputs from position switches, VSS, PNP switch, and select switches to control transfer shift actuator and ADD actuator, which controls all transfer case shifts and gear selections.
4WD POSITION SWITCH
Two 4WD position switches send signals to 4WD ECU to indicate transfer case gear position.