Pinpoint Test I: ESOF Functional Test
- Possible Causes
- 4WD system and/or related components
- I1 CHECK FOR CMDTC
- Ignition ON.
- Enter the following diagnostic mode: CMDTC Self-Test.
Are any DTC related to engine torque, transmission gear, ambient temperature, TCCM communication, or transfer case operation present?
Yes RESOLVE all DTC first. No GO to I2 - I2 CHECK 2H OPERATION
- Ignition OFF.
- Switch the MSS to 2H
- Ignition ON.
Does the message center display 4X2 or 2WD for approximately 4 seconds?
Yes GO to I3 No REPAIR all message center or IPCDTC - I3 CHECK FOR WIND-UP IN 2H
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind-up present in turns?
Yes GO to I4 No GO to I5 - I4 CHECK FOR TRANSFER CASE DISENGAGEMENT
- With the vehicle in NEUTRAL, position it on a hoist. REFER to: Jacking and Lifting .
- Rotate the rear driveshaft while observing the front driveshaft.
Does the front driveshaft rotate?
Yes GO to Pinpoint Test B No GO to I5 - I5 CHECK WIND-UP IN 4H MODE
- Drive the vehicle in 4H mode while turning.
Is wind-up present in turns?
Yes GO to I7 No GO to I6 - I6 CHECK FOR TRANSFER CASE ENGAGEMENT
- MSS in 4H
- With the vehicle in NEUTRAL, position it on a hoist. REFER to: Jacking and Lifting .
- Rotate the rear driveshaft while observing the front driveshaft.
Does the front driveshaft rotate?
Yes GO to I7 No GO to Pinpoint Test B - I7 CHECK 4L OPERATION
- Bring the vehicle to a stop with the transmission in NEUTRAL and switch the MSS to 4L.
- Drive the vehicle in 4L mode
Did the transfer case operate in 4L?
Yes GO to I8 No GO to Pinpoint Test C - I8 CHECK 2H TO 4H SHIFT AT SPEED ABOVE 32 KM/H (20 MPH)
- Switch the MSS to 2H.
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NOTE: When performing 2H to 4H or 4H to 2H shift, release the accelerator pedal prior to the shift and wait until Shift in Progress disappears.
Drive the vehicle on the road and shift from 2H to 4H while driving above 32 km/h (20 mph).
Does the transfer case shift to 4H satisfactorily?
Yes The 4WD system is functioning correctly. No GO to Pinpoint Test B