Pinpoint Tests - 1 - Speed Torque on-Demand
Pinpoint Tests
Pinpoint Test D: No Communication With The 4-Wheel Drive (4WD) Control Module
Normal Operation
The 4WD control module communicates with the diagnostic tool through the universal asynchronous receiver-transmitter (UART)-based protocol (U BP) communications network circuit 693 (OG). If the 4WD control module loses power, it will not be able to communicate. Check power circuit 972 (BK/WH) and ground circuit 1203 (BK/LB) for an open. If the circuits prove out, refer to Information Bus for furtherdiagnostics.
Possible Causes
- Circuit 972 (BK/WH)
- Circuit 1203 (BK/LB)
- 4WD control module
- Circuit 693 (OG)
PINPOINT TEST D: NO COMMUNICATION WITH THE 4-WHEEL DRIVE (4WD) CONTROL MODULE
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
Pinpoint Test E: The Vehicle Does Not Shift Between AWD AUTO and AWD LOCKED Correctly
Normal Operation
With the key in the ON position, the 4WD control module receives the operators choice of four-wheel drive selection from the message center. The 4WD control module then controls the electric clutch. If the transfer case is not responding to the operators intentions, systematically check all inputs and outputs to the 4WD control module. Check all circuits for opens and shorts to ground.
Possible Causes
- 4WD control module
- Transfer case electric clutch
- Circuit 779 (BN)
- Circuit 976 (OG)
- Circuit 357 ~EIWH)
- Circuit 3126 (TN/YE)
- Circuit 3125 (RD/YE)
- 4WD indicator
- Instrument cluster (IC)
PINPOINT TEST E: THE VEHICLE DOES NOT SHIFT BETWEEN AWD AUTO AND AWD LOCKED CORRECTLY
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
Pinpoint Test F: The AWD Indicator Does Not Operate Correctly/Does Not Operate/Flashes Normal Operation
The AWD LOCKED indicator status is transmitted to the instrument cluster from the 4WD module through the controller area network (CAN). A steady indicator displays when the vehicle is in AWD LOCKED, according to the driver selection. Depending on the type of failure, the indicator flashes at 2 minute intervals to indicate all-wheel drive (AWD) system fault conditions. For additional information about CAN, refer to Information Bus. Information Bus
Possible Causes
- Instrument cluster (IC)
- AWD system fault
- CAN circuits
- 4WD control module
PINPOINT TEST F: THE AWD INDICATOR DOES NOT OPERATE CORRECTLY/DOES NOT OPERATE/FLASHES
Pinpoint Test G: Straightime Driveline Wind-up Normal Operation
In order for the AWD system to function correctly, tires and wheels must be the same size, be in good condition and the front and rear axle ratios must match.
Possible Causes
- Unmatched tire sizes
- Unequal amounts of tire wear
- Unequal tire inflation pressures
- Unmatched front and rear axle ratios
PINPOINT TEST G: STRAIGHTLINE DRIVELINE WIND-UP
NOTE: AWD LOCKED mode is not intended for driving on hard/dry surfaces.
Pinpoint Test H: AWD System Functional Test Normal Operation
When the vehicle is operating in AWD locked, all 4 wheels rotate at the same speed. The amount of traction the vehicle can achieve is dependent on the amount of traction each tire can establish with the road surface. In order for the AWD system to operate correctly, each wheel/tire assembly must have matching sizes and the front and rear axle ratios must match.
Possible Causes
- AWD indicator
- 4WD control module
- Transfer case and related components
- Wheel/tire assemblies
PINPOINT TEST H: AWD SYSTEM FUNCTIONAL TEST
NOTE: AWD Locked mode is not intended for driving on hard/dry surfaces.
Pinpoint Test I: The Vehicle Binds In Turns/Resists TurninglPulsateslshudders In A Straightime
Normal Operation
When the vehicle is operating in AWD LOCKED mode, all 4 wheels receive the same amount of torque and rotate at the same speed. The amount of traction the vehicle can achieve is dependent on the amount oftraction each tire can establish with the road surface. In order for the AWD system to function correctly, each tire must be in good condition and the front and rear axle ratios must match.
Possible Causes
- Unmatched tire sizes
- Unequal amounts of tire wear
- Unequal tire inflation pressures
- Unmatched front and rear axle ratios
PINPOINT TEST I: THE VEHICLE BINDS IN TURNS/RESISTS TURNINGIPULSATESISHUDDERS IN A STRAIGHT LINE
NOTE: AWD LOCKED mode is not intended for driving on hard/dry surfaces.