Pinpoint Test P: Four-Wheel Drive (4WD) System Functional Test
Four Wheel Drive (4WD) Systems - 2-Speed Torque-On-Demand
Pinpoint Tests
Pinpoint Test P: Four-Wheel Drive (4WD) System Functional Test
Refer to Wiring Diagram Set 34, Four-Wheel Drive (4WD) System for schematic and connector information. Diagrams By Number
Normal Operation
When the vehicle is operating in 4X4 HIGH or 4X4 LOW (4H/4L), all 4 wheels rotate at the same speed. The amount of traction the vehicle can achieve depends on the amount of traction each tire can establish with the road surface. In order for the Four-Wheel Drive (4WD) system to operate correctly, each wheel/tire assembly must have matching sizes and the front and rear axle ratios must match.
This pinpoint test is intended to diagnose the following:
- 4X4 indicators
- 4X4 control module
- Transfer case and related components
- Wheel/tire assemblies
PINPOINT TEST P: 4WD SYSTEM FUNCTIONAL TEST
NOTE: 4X4 HIGH/4X4 LOW are not intended for driving on hard/dry surfaces.
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P1 CHECK 4X4 INDICATOR PROVE-OUT
- Ignition ON.
- Do the 4X4 indicators illuminate at prove out?
Yes
GO to P2.
No
CHECK the Instrument Cluster (IC). REFER to Instrument Panel, Gauges and Warning Indicators. TEST the system for normal operation.
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P2 CHECK 4X4 AUTO OPERATION
- If in 4X4 LOW, switch the Mode Select Switch (MSS) to 4X4 AUTO.
- Are the 4X4 indicators off?
Yes
GO to P5.
No
GO to P3.
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P3 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the 4X4 control module self-test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. 4X4 Control Module DTC Chart
No
GO to P4.
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P4 CHECK FOR WIND-UP IN 4X4 AUTO
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test J. Pinpoint Test J: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 HIGH Correctly
No
GO to Pinpoint Test K. Pinpoint Test K: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 LOW Correctly
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P5 CHECK THE 4WD CLUTCH PWM STATUS (4WDCPWMST) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
- Monitor the 4WDCPWMST PID.
- Does the 4WDCPWMST PID indicate 2-4% clutch application at closed throttle?
Yes
GO to P7.
No
GO to P6.
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P6 CHECK THE TRANSFER CASE CONTACT PLATE SWITCH PIDs
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
- Using the active command PLATE_PWR to energize the transfer case motor contact plate position return circuit.
- NOTE: Plate PIDs are momentarily monitored when switching positions.
- Monitor the 4X4 control module Transfer Case Contact Plate Switch A (PLATE_A), B (PLATE_B), C (PLATE_C) and D (PLATE_D) PIDs. Refer to the following chart:
- Does the contact plate position PIDs indicate that the transfer case shift motor is in 4X4 AUTO?
Yes
GO to Pinpoint Test J. Pinpoint Test J: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 HIGH Correctly
No
GO to Pinpoint Test K. Pinpoint Test K: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 LOW Correctly
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P7 CHECK FRONT SHAFT SPEED (FR_OUTSHA) AND REAR SHAFT SPEED (R_OUTSHA) PIDs
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
- Monitor the FR_OUTSHA AND R_OUTSHA PIDs.
- Drive the vehicle at 30 km/h (18 mph).
- Record and compare the FR_OUTSHA AND R_OUTSHA PIDs.
- Do the FR_OUTSHA and R_OUTSHA PID values match within 1.5 km/h (1 mph)?
Yes
GO to P8.
No
CHECK the ABS. REFER to Antilock Brakes / Traction Control Systems and VERIFY that the 4 road tire sizes match. TEST the system for normal operation.
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P8 CHECK THE TP STATUS (TPI) PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
- NOTE: The TPI PID is APP as communicated by the PCM via High Speed Controller Area Network (HS-CAN).
- Slowly move throttle from closed throttle to Wide Open Throttle (WOT) and observe the 4X4 control module TPI PID, Key ON Engine OFF (KOEO).
- Does the TPI PID value vary between 0 at closed throttle and 255 at WOT?
Yes
GO to P9.
No
CHECK the APP accelerator pedal position sensor and/or PCM. REFER to Computers and Control Systems Information. TEST the system for normal operation.
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P9 CHECK FOR WIND-UP IN TURNS ON THROTTLE
- Drive the vehicle on a dry, hard surface, executing turns while applying the throttle.
- Is wind-up present?
Yes
CHECK the transfer case. REFER to Transfer Case. TEST the system for normal operation.
No
GO to P10.
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P10 CHECK 4X4 HIGH OPERATION
- Select 4X4 HIGH.
- Does the 4X4 indicator illuminate correctly?
Yes
GO to P11.
No
GO to P12.
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P11 CHECK FOR 4X4 HIGH WIND-UP
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
Yes
GO to P14.
No
GO to Pinpoint Test J. Pinpoint Test J: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 HIGH Correctly
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P12 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the 4X4 control module self-test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. 4X4 Control Module DTC Chart
No
GO to P13.
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P13 CHECK FOR WIND-UP IN 4X4 HIGH ON THROTTLE
- Drive the vehicle on a dry, hard surface in turns while applying the throttle.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test K. Pinpoint Test K: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 LOW Correctly
No
GO to Pinpoint Test J. Pinpoint Test J: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 HIGH Correctly
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P14 CHECK THE 4X4 LOW OPERATION
- Select 4X4 LOW:
- vehicle stationary.
- shift the transmission to NEUTRAL.
- select 4X4 LOW.
- wait for the 4X4 LOW indicator to illuminate in the IC indicating that the shift is complete.
- Does the 4X4 LOW indicator illuminate?
Yes
GO to P15.
No
GO to P16.
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P15 CHECK FOR WIND-UP IN 4X4 LOW
- Drive the vehicle on a dry, hard surface in turns while applying the throttle.
- Is wind-up present in turns?
Yes
GO to P19.
No
GO to P17.
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P16 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the 4X4 control module self-test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. 4X4 Control Module DTC Chart
No
GO to P18.
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P17 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the 4X4 control module self-test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. 4X4 Control Module DTC Chart
No
GO to Pinpoint Test J. Pinpoint Test J: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 HIGH Correctly
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P18 CHECK FOR WIND-UP IN 4X4 LOW
- Drive the vehicle on a dry, hard surface in turns while applying the throttle.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test K. Pinpoint Test K: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 LOW Correctly
No
GO to Pinpoint Test J. Pinpoint Test J: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 HIGH Correctly
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P19 CHECK 4X4 AUTO OPERATION
- Switch the MSS to 4X4 AUTO.
- Do the 4X4 indicators turn off?
Yes
The 4WD system is operating correctly.
No
GO to P20.
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P20 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the 4X4 control module self-test.
- Are DTCs retrieved?
Yes
REFER to the 4X4 Control Module DTC Chart. 4X4 Control Module DTC Chart
No
GO to P21.
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P21 CHECK FOR WIND-UP IN 4X4 AUTO
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
Yes
GO to Pinpoint Test L. Pinpoint Test L: The 4X4 Indicators Do Not Operate Correctly/Do Not Operate
No
GO to Pinpoint Test K. Pinpoint Test K: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 LOW Correctly
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