KC-615

4/29/22, 11:03 AM
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Vehicles With An Automated Manual
Transmission Model F (AMT-F) With Crawler
Gearbox - Diagnostic Trouble Code (DTC) P10C797 Crawler Gear Engagement System Blocked
Shift To Neutral Position; Vehicle Stuck In Limp
Mode Or Will Not Shift Into Gear
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Internal Content
Guided Diagnostics are under review for this fault. Until
improvements are made to GD, please use this CBR to diagnose
this fault.
Crawler function:
The crawler shifter cannot be engaged if the splitter shifter is in a gear.
The splitter shifter MUST be in neutral for the crawler shifter to move.
Likewise, the splitter cannot move from the neutral position if the
crawler is in gear. The lockout function is mechanical and internal to
the gearbox.
• Before claiming a stuck crawler shift assembly ensure the
splitter is in Neutral.
If the fault is inactive with high counts.
1. In Premium Tech Tool (PTT), run Test 4320-08-03-40 Gears or 432008-03-49 Ultra-low Crawler Cylinder several times, or shift the
transmission into and out of crawler gear with the shift lever several
times.
- See if the unit will log P10C7 and stop shifting.
- Listen for air leaks during the tests/shifting.
1.1 If the unit stops shifting and logs a fault: Go to the Active Fault
section below.
1.2 If the vehicle will not log the fault:
1.2.1. Remove the EVU from the upper right side of the extension
section.
1.2.2. Manually manipulate the plunger.
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○ The return spring is very stiff but the plunger should feel smooth
and not hang up in its travel or feel like it is dragging in the bore.
1.2.3. If the plunger feels like it is dragging, replace the EVU
If the fault is Active or becomes active during the above listed
steps:
1. Carefully remove the EVU from the upper right side of the extension
section.
2. Check that the position sensor plunger is not stuck.
2.1. If the plunger is found to be sticking: Replace the EVU.
2.2. If the plunger is not stuck and moves smoothly: Check the
crawler shifter for freedom of movement.
2.2.1. If the crawler is engaged, the shifter will be in the forward
position (closer to the engine).
2.2.1.1. Insert a pry bar in front of the shifter and pry the shifter
rearward. It should move freely except for the detent plunger pressure
that is internal to the gearbox.
2.2.1.2. If the crawler shifter moves easily manually: Use a rubber
tipped air blower to put air to the two ports inside the gearbox to shift
the unit with air pressure.
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Tags
k03785558
p10c7-97
p10c797
volvo
mack
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