Pinpoint Test G: Electronic Shift-On-The-Fly (ESOF) Functional Test
Four Wheel Drive (4WD) Systems - Electronic Shift
Pinpoint Tests
Pinpoint Test G: Electronic Shift-On-The-Fly (ESOF) Functional Test
Refer to Wiring Diagram Set 34, Four-Wheel Drive System for schematic and connector information. Diagrams By Number
Normal Operation
When operating in Four-Wheel Drive (4WD), the transfer case is locked. When in 4X4 LOW, the transfer case low range gear set provides an additional 2.64 gear reduction. When operating in 2-Wheel Drive (2WD), the transfer case is unlocked.
This pinpoint test is intended to diagnose the following:
- Transfer case and related components
- Wheel/tire assemblies
PINPOINT TEST G: ELECTRONIC SHIFT-ON-THE-FLY (ESOF) FUNCTIONAL TEST
NOTE: 4X4 HIGH/4X4 LOW is not intended for driving on hard/dry surfaces.
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G1 CHECK FOR 4WD INDICATOR PROVE OUT
- Ignition OFF.
- Ignition ON.
- Do the 4WD indicators illuminate at prove out?
Yes
GO to G2.
No
CHECK the Instrument Cluster (IC) for faults. REFER to Instrumentation and Warning Chimes Testing and Inspection.
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G2 CHECK 2WD OPERATION
- Stop the vehicle.
- Transmission in NEUTRAL.
- Switch the Mode Select Switch (MSS) to 2H.
- Do the 4WD indicators turn off?
Yes
GO to G5.
No
GO to G3.
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G3 CHECK FOR DTCs
- Transmission in PARK.
- Connect the scan tool.
- Carry out the on-demand self test.
- Are DTCs retrieved?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to G4.
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G4 CHECK FOR WIND-UP IN 2WD
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind-up present in turns?
Yes
REPAIR the transfer case. REFER to Transfer Case Overhaul.
No
GO to G5.
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G5 CHECK 4X4 HIGH OPERATION
- Switch the MSS to 4H.
- Does the 4X4 HIGH indicator illuminate correctly?
Yes
GO to G8.
No
GO to G6.
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G6 CHECK FOR DTCs
- Transmission in PARK.
- Connect the scan tool.
- Carry out the on-demand self test.
- Are DTCs retrieved?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to G7.
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G7 CHECK FOR WIND-UP IN 4X4 HIGH
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test H. Pinpoint Test H: Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate
No
GO to Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between 2-Wheel Drive (2WD) and Four-Wheel Drive (4WD) Modes Correctly
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G8 CHECK FOR WIND-UP IN 4X4 HIGH
- Drive the vehicle on a dry, hard surface.
- Is straightline wind-up present?
Yes
GO to Pinpoint Test F. Pinpoint Test F: Straightline Driveline Wind-up
No
GO to G9.
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G9 CHECK FOR 4X4 HIGH WIND-UP IN TURNS
- Drive the vehicle in 4X4 HIGH while turning.
- Is wind-up present in turns?
Yes
GO to G10.
No
GO to Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between 2-Wheel Drive (2WD) and Four-Wheel Drive (4WD) Modes Correctly
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G10 CHECK 4X4 LOW OPERATION
- Bring the vehicle to a stop, transmission in NEUTRAL, switch the MSS to 4L.
- Does the 4X4 LOW indicator illuminate correctly?
Yes
GO to G13.
No
GO to G11.
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G11 CHECK FOR DTCs
- Transmission in PARK.
- Release the brake pedal.
- Connect the scan tool.
- Carry out the on-demand self test.
- Are DTCs retrieved?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to G12.
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G12 CHECK FOR WIND-UP IN 4X4 LOW
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test H. Pinpoint Test H: Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate
No
GO to Pinpoint Test D. Pinpoint Test D: The Vehicle Does Not Shift Between Four-Wheel Drive (4WD) High and Four-Wheel Drive (4WD) Low Correctly
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G13 CHECK FOR 4X4 LOW WIND-UP IN TURNS
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind-up present and 4X4 LOW functioning?
Yes
GO to G14.
No
CHECK for 4X4 control module DTCs. REFER to the Inspection and Verification procedure Inspection and Verification. If no DTCs are present, GO to Pinpoint Test D. Pinpoint Test D: The Vehicle Does Not Shift Between Four-Wheel Drive (4WD) High and Four-Wheel Drive (4WD) Low Correctly
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G14 CHECK 4X4 LOW TO 2WD SHIFT
- With the vehicle at a stop and the transmission in NEUTRAL, switch the MSS from 4L to 2H.
- Do the 4WD indicators turn off?
Yes
GO to G17.
No
GO to G15.
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G15 CHECK FOR DTCs
- Transmission in PARK.
- Release the brake pedal.
- Connect the scan tool.
- Carry out the on-demand self test.
- Are DTCs retrieved?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to G16.
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G16 CHECK FOR WIND-UP IN 2WD
- Switch the MSS to 2H.
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test D. Pinpoint Test D: The Vehicle Does Not Shift Between Four-Wheel Drive (4WD) High and Four-Wheel Drive (4WD) Low Correctly
No
GO to Pinpoint Test H. Pinpoint Test H: Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate
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G17 CHECK FOR TRANSFER CASE DISENGAGEMENT
- With the vehicle in NEUTRAL, position it on a hoist. Refer to Jacking and Lifting Service and Repair.
- Rotate the rear driveshaft while observing the front driveshaft.
- Does the front driveshaft rotate?
Yes
REFER to Transfer Case Overhaul.
No
GO to G18.
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G18 CHECK 2WD TO 4X4 HIGH SHIFT AT SPEED ABOVE 32 KM/H (20 MPH)
- Switch the MSS to 2H.
- Drive the vehicle on the road and shift from 2WD to 4X4 HIGH while driving above 32 km/h (20 mph).
- Does the transfer case shift to 4X4 HIGH satisfactorily?
Yes
The 4WD system is functioning correctly.
No
GO to Pinpoint Test F. Pinpoint Test F: Straightline Driveline Wind-up
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