IK1300070 Service Bulletin/Repair Instructions

IK1300070 - Transfer case troubleshooting
Page 1 of 3
Countries:
AUSTRALIA, BRAZIL, CANADA, UNITED STATES,

MEXICO, SOUTH AFRICA
Document

ID:
IK1300070
Availability:
ISIS, Bus ISIS, FleetISIS, Body Builder
Revision:
2
Major System:
TRANSMISSION
Created:
10/27/2009
Current

Language:
English
Last

Modified:
5/22/2013
Other

Languages:
Français, Español ,
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Title: Transfer case troubleshooting

Applies To: All transfer case equipped NGV units
DESCRIPTION

Air flow and wiring information for units equipped with a transfer case.

The transfer case can be in 5 different states:










4x4 or 6x6 High Range

4x4 or 6x6 Low Range

4x2 or 6x4 High Range

4x2 or 6x4 Low Range

Neutral
SYMPTOMS




Transfer case will not shift

Air leaking from neutral air solenoid, on air solenoid pack
TROUBLESHOOTING

1. Check for fault codes using DLB. Verify if there is an issue for the switch input, the output command, or a mechanic issue with air flow or the

shift cylinders. For information on checking faults in DLB follow IK2600036
2. Verify the interlocks are being met properly. Make a session in DLB using the feature that is installed for the Transfer case. If you are
3.

4.

5.

6.
unfamiliar with making a session from a feature in DLB follow IK2600008

 In order to shift ranges the following signals must be seen in DLB:

 Park Brake is Set or the Service Brakes are applied

 Ignition is On

 Primary air pressure is greater than 90 psi

 Transmission is in Neutral or Park (Automatic Transmission)

 Vehicle is stopped (No vehicle speed being seen)

 Key State has a valid value

 In order to engage the front axle:

 Vehicle speed must be less than 10 mph

 Ignition is On

 Primary air pressure is greater than 90 psi

 Vehicle is not in a Traction Control event

 Key state has a valid value

Verify the correct solenoids are installed. The transfer case utilized normally closed solenoids. When the solenoid is energized it will then

allow air flow to the transfer case.

Verify which system is installed on the truck. The air flow will be the same for both systems. A 4-pack air solenoid board uses high side (12v)

drivers to each solenoid, while a RASM uses a datalink message sent over the body builder (private) datalink from module to module.

For each solenoid location, unplug the air line, and then turn the switch on in the cab to energize that solenoid. If you now have air flow at

that solenoid location, the electrical side is checking good. (Example: With Neutral selected at the switch pack, you should have air flow at

solenoid B only)

Check each shift solenoid at the transfer case. Manually apply air pressure to see if the transfer case will shift, and listen for any air leaks.
System Equipped with a 4-Pack Air Solenoid Board
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IK1300070 - Transfer case troubleshooting
Page 2 of 3
System Equipped with a 7-Pack RASM (Remote Air Solenoid Board)
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IK1300070 - Transfer case troubleshooting
Page 3 of 3
Operating Mode
Solenoid A (Low Range)
Solenoid B (Neutral)
Solenoid C (High Range)
Solenoid D (Front Axle)
4x4 or 6x6 High

Range
Normally Closed State (No air

flow)
Normally Closed State (No air flow)
Energized (Allowing air flow)
Energized (Allowing air flow)
4x4 or 6x6 Low

Range
Energized (Allowing air flow)
Normally Closed State (No air flow)
Normally Closed State (No air

flow)
Energized (Allowing air flow)
4x2 or 6x4 High

Range
Normally Closed State (No air

flow)
Normally Closed State (No air flow)
Energized (Allowing air flow)
Normally Closed State (No air

flow)
4x2 or 6x4 Low

Range
Energized (Allowing air flow)
Normally Closed State (No air flow)
Normally Closed State (No air

flow)
Normally Closed State (No air

flow)
Neutral
Normally Closed State (No air

flow)
Energized (Allowing air flow)
Normally Closed State (No air

flow)
Normally Closed State (No air

flow)
RESOLUTION

If you find the shift cylinders on the transfer case are leaking, replacement of all four orings is required. Each piston has an outer and an inner oring. This procedure can

be performed without the removal or disassembly of the transfer case. Please see attached link to the ArvinMeritor service manual for details of the removal and installation

procedure.
OTHER RESOURCES


Meritor Transfer Case Manual MM0146
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Copyright © 2013 Navistar, Inc.
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