Pinpoint Test D : Four-Wheel Drive (4WD) System Functional Test
- D1 CHECK 2H MODE OPERATION
- Shift the transmission into the NEUTRAL position.
- Switch the MSS to 2H mode.
Are there any 4WD mode indicators present in the IPC message center?
Yes GO to D2 No GO to D4 - D2 CHECK FOR TCCM DTCS
- Shift the transmission into the PARK position.
- Ignition ON.
- Enter the following diagnostic mode: TCCM Self-test.
Are DTCs retrieved?
Yes REFER to DTC Chart: TCCM . No GO to D3 - D3 CHECK FOR WIND-UP IN 2H MODE
- Drive the vehicle on a dry, hard surface while executing turns and applying 10-15% throttle.
Is wind-up present in turns?
Yes GO to Pinpoint Test E No To diagnose the 4X4 mode indicators do not operate correctly/do not operate, REFER to: Instrumentation, Message Center and Warning Chimes . - D4 CHECK AUTO MODE OPERATION
- Switch the MSS to 4A mode.
Is the 4X4 auto (4A) mode indicator on in the IPC message center?
Yes GO to D7 No GO to D5 - D5 CHECK FOR TCCM DTCS
- Ignition ON.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTC's present?
Yes REFER to DTC Chart: TCCM . No GO to D6 - D6 CHECK FOR WIND-UP IN 4A MODE
- Drive the vehicle on a dry, hard surface, executing turns while applying the throttle.
Is wind-up present in turns?
Yes GO to D7 No GO to D8 - D7 CHECK THE TCCM 4WD PWM CLUTCH STATUS (4WD_CLTCH_OS) PID
- Enter the following diagnostic mode: TCCM DataLogger.
- Monitor the 4WD_CLTCH_OS PID.
Does the PID indicate 0% to 10% clutch application at closed throttle?
Yes GO to D8 No GO to D9 - D8 CHECK FOR WIND-UP IN 4A MODE WITH 100% CLUTCH DUTY CYCLE
- Enter the following diagnostic mode: TCCM DataLogger.
- Command the 4WD_CLTCH_OS to 100%.
- Drive the vehicle on a dry, hard surface, executing turns.
Is wind-up present in turns?
Yes GO to D9 No CHECK the transfer case. REFER to: Transfer Case . - D9 CHECK THE TCCM AVERAGE FRONT WHEEL SPEED
- Enter the following diagnostic mode: TCCM DataLogger.
- Monitor the FRT_WHL_SPD and REAR_WHL_SPD PIDs.
- Drive the vehicle 30 km/h (18 mph).
- Record and compare the FRT_WHL_SPD and REAR_WHL_SPD PIDs.
Do the FRT_WHL_SPD and REAR_WHL_SPD PID values match within 1.5 km/h (1 mph)?
Yes GO to D10 No VERIFY all 4 tires are the same size and brand. INSTALL new tires as necessary. If the tires are OK, CHECK the ABS. and VERIFY that the 4 road tire sizes match. REFER to: Anti-Lock Brake System (ABS) and Stability Control . - D10 CHECK THE TCCM ABSOLUTE THROTTLE POSITION (TP_TCCM) PID
- Enter the following diagnostic mode: TCCM DataLogger.
- Monitor the TP_TCCM PID.
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NOTE: The TP_TCCM PID is as communicated by the PCM via HS-CAN.
Slowly move throttle from closed throttle to WOT and observe the TP_TCCM PID.
Does the TP_TCCM PID value vary between 0% at closed throttle and 100% at WOT?
Yes GO to D11 No CHECK the APP sensor and/or the PCM. Refer to Engine Controls - Introduction (Except Diesel & Hybrid) or Engine Controls - Introduction (Diesel) . - D11 CHECK 4H MODE OPERATION
- Switch the MSS to 4H mode.
Does the 4X4 (4H) indicator illuminate in the IPC message center correctly?
Yes GO to D14 No GO to D12 - D12 CHECK FOR TCCM DTCS
- Shift the transmission into the PARK position.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs retrieved?
Yes REFER to DTC Chart: TCCM . No GO to D13 - D13 CHECK FOR WIND-UP IN 4H MODE
- Drive the vehicle on a dry, hard surface while executing turns and applying 10-15% throttle.
Is wind-up present in turns?
Yes GO to Pinpoint Test F No GO to Pinpoint Test D - D14 CHECK FOR STRAIGHTLINE WIND-UP IN 4H MODE
- Drive the vehicle on a dry, hard surface.
Is straightline wind-up present?
Yes GO to Pinpoint Test H No GO to D15 - D15 CHECK WIND-UP IN TURNS IN 4H MODE
- Drive the vehicle in 4H mode while turning and applying 10-15% throttle.
Is wind-up present in turns?
Yes GO to D16 No GO to Pinpoint Test D - D16 CHECK 4L MODE OPERATION
- Bring the vehicle to a stop with the transmission in NEUTRAL, switch the MSS to 4L mode.
Does the 4WD LOW (4L) indicator in the IPC message center illuminate correctly?
Yes GO to D19 No GO to D17 - D17 CHECK FOR TCCM DTCS
- Select PARK.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs retrieved?
Yes REFER to DTC Chart: TCCM . No GO to D18 - D18 CHECK FOR WIND-UP IN 4L MODE
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind-up present in turns?
Yes GO to Pinpoint Test K No GO to Pinpoint Test E - D19 CHECK FOR WIND-UP IN TURNS IN 4L MODE
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind-up present and 4L mode functioning?
Yes GO to D20 No CHECK for DTCs. REFER to Inspection and Verification . If no DTCs are present, GO to Pinpoint Test E - D20 CHECK 4L MODE TO 2H MODE SHIFT
- With the vehicle at a stop and transmission in NEUTRAL, switch the MSS from 4L mode to 2H mode.
Are there any 4WD mode indicators present in the message center?
Yes GO to D21 No GO to D23 - D21 CHECK FOR TCCM DTCS
- Select PARK.
- Release the brake pedal.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs retrieved?
Yes REFER to DTC Chart: TCCM . No GO to D22 - D22 CHECK FOR WIND-UP IN 2H MODE
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind-up present in turns?
Yes GO to Pinpoint Test E No To diagnose the 4X4 mode indicators do not operate properly, REFER to: Instrumentation, Message Center and Warning Chimes . - D23 CHECK FOR TRANSFER CASE DISENGAGEMENT
- With the vehicle in NEUTRAL, position it on a hoist. REFER to: Jacking and Lifting - Overview .
- Rotate the rear driveshaft while observing the front driveshaft.
Does the front driveshaft rotate?
Yes REFER to: Transfer Case . No GO to D24 - D24 CHECK FOR LH AND RH IWE (INTEGRATED WHEEL END) DISENGAGEMENT
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NOTE: The engine must be at idle during the following steps to supply vacuum for IWE disengagement.
Start the engine and allow to idle.
- Rotate the LH front tire one revolution forward and one revolution backward while observing the LF halfshaft and U-joint.
- Rotate the RH front tire one revolution forward and one revolution backward while observing the RF halfshaft and U-joint.
Does the LH or RH front halfshaft rotate?
Yes GO to Pinpoint Test C No GO to D25 -
- D25 CHECK FOR VACUUM LEAKS
- Ignition OFF.
- Disconnect both vacuum lines from the IWE solenoid.
- Using a hand vacuum pump, apply 508 mm (20 in) Hg of vacuum to the IWE apply vacuum circuit.
- Observe the vacuum reading.
Did the vacuum drop more than 25 mm (1 in) Hg per minute?
Yes CHECK the IWE and related components for leaks. No GO to D26 - D26 CHECK 2H MODE TO 4H MODE SHIFT AT SPEED ABOVE 32 KM/H (20 MPH)
- Switch the MSS to 2H mode.
- Drive the vehicle on the road and shift from 2H mode to 4H mode while driving above 32 km/h (20 mph).
Does the transfer case shift to 4H mode satisfactorily?
Yes The 4WD system is functioning correctly. No GO to Pinpoint Test F