Pinpoint Test J : Electronic Shift-On-The-Fly (ESOF) System Functional Test
- J1 CHECK FOR IPC DTCS
- Ignition ON.
- Enter the following diagnostic mode: IPC Self-Test.
Are any DTCs present?
Yes If DTC U0102:00 is retrieved, REFER to: Communications Network . For all other DTCs, REFER to: Information Center - Instrumentation, Message Center And Warning Chimes . No GO to J2 - J2 CHECK 2H OPERATION
- Stop the vehicle.
- Make sure both CVH dials are in AUTO mode.
- Transmission in NEUTRAL.
- Switch the MSS to 4H then to 2H.
Does the IPC 4X4 HIGH indicator turn off and does the message center (if equipped) display 4X2 for approximately 4 seconds?
Yes GO to J4 No GO to J3 - J3 CHECK FOR TCCM DTCS
- Ignition ON.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs present?
Yes REFER to DTC Chart: Transfer Case Control Module (TCCM) No GO to J4 - J4 CHECK FOR WIND UP IN TURNS IN 2H
- Make sure both CVH dials are in AUTO mode.
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind-up present in turns?
Yes GO to Pinpoint Test D No GO to J5 - J5 CHECK 4H OPERATION
- Stop the vehicle.
- Lock the LH and RH CVHs.
- Transmission in NEUTRAL.
- Switch the MSS to 4H.
Does the IPC 4X4 HIGH indicator illuminate correctly or message center (if equipped) display 4X4 HIGH?
Yes GO to J9 No GO to J6 - J6 CHECK FOR RETURN OF TCCM DTCS
- Transmission in PARK.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs retrieved?
Yes REFER to DTC Chart: Transfer Case Control Module (TCCM) No GO to J7 - J7 CHECK WIND UP IN TURNS IN 4H MODE
- Drive the vehicle in 4H mode while turning.
Is wind up and tire scuff present?
Yes GO to J8 No I GO to Pinpoint Test D - J8 CHECK FOR STRAIGHTLINE WIND UP IN 4H
- Drive the vehicle on a dry, hard surface while driving in a straight line.
Is wind up present?
Yes GO to Pinpoint Test I No GO to J9 - J9 CHECK FOR LH AND RH CVH ENGAGEMENT IN 4H
- Switch the MSS to 4H.
- Make sure both CVH dials are in AUTO mode position.
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NOTE: The engine must be at idle during the following steps to supply vacuum for CVH engagement.
With the vehicle in NEUTRAL, position it on a hoist.
- Start the engine and allow to idle.
- Rotate the LH front tire one revolution forward and one revolution backward while observing the LH front axle shaft and U-joint.
- Rotate the RH front tire one revolution forward and one revolution backward while observing the RH front axle shaft and U-joint.
Does the LH or RH front axle shaft rotate?
Yes GO to J11 No GO to J10 - J10 CHECK FOR CVH VACUUM LEAKS
- Ignition OFF.
- Disconnect both vacuum tubes from the hublock vacuum solenoid.
- Using a vacuum pump, apply 508 mm-Hg (20 in- Hg) of vacuum to the CVH vacuum circuit.
- Observe the vacuum reading.
Did the vacuum drop more than 25 mm-Hg (1 in-Hg) per minute?
Yes CHECK the CVH and related components for leaks. GO to Pinpoint Test F No CONNECT the hublock vacuum solenoid vacuum lines and GO to J11 - J11 CHECK 4L OPERATION
- Bring the vehicle to a speed below 5 km/h (3 mph). With the transmission in NEUTRAL, switch the MSS to 4L
Does the IPC 4X4 LOW indicator illuminate correctly or message center (if equipped) display 4X4 LOW?
Yes GO to J13 No GO to J12 - J12 CHECK FOR TCCM DTCS
- Select PARK.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs retrieved?
Yes REFER to DTC Chart: Transfer Case Control Module (TCCM) No GO to J13 - J13 CHECK FOR WIND UP IN TURNS IN 4L
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind up and tire scuff present and 4L operating?
Yes GO to Pinpoint Test C No GO to J14 - J14 CHECK FOR STRAIGHTLINE WIND UP IN 4L
- Drive the vehicle in 4L while driving in a straight line.
Is wind up present?
Yes GO to Pinpoint Test I No GO to J15 - J15 CHECK 4L TO 2H SHIFT
- With the vehicle at a stop and transmission in NEUTRAL, switch the MSS from 4L to 2H.
Does the 4X4 LOW indicator turn off or (if equipped) IPC message center display 4X2 for approximately 4 seconds then turn off?
Yes GO to J17 No GO to J16 - J16 CHECK FOR TCCM DTCS
- Select PARK.
- Enter the following diagnostic mode: TCCM Self-Test.
Are DTCs retrieved?
Yes REFER to DTC Chart: Transfer Case Control Module (TCCM) No GO to J17 - J17 CHECK FOR WIND UP IN TURNS IN 2H
- Drive the vehicle on a dry, hard surface while executing turns.
Is wind up and tire scuff present in turns?
Yes GO to Pinpoint Test E No GO to J18 - J18 CHECK 2H TO 4H SHIFT
- Switch the MSS to 2H.
- 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 operating correctly. No GO to Pinpoint Test G