K03785558
Service Bulletin Details
Public Details for: K03785558
Vehicles with an automated manual transmission model f (amt-f) with crawler gearbox - diagnostic trouble code (dtc) P10C7-97 crawler gear engagement system blocked shift to neutral position; vehicle stuck in limp mode or will not shift into
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Models from 2020
2020 VOLVO VNX |
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2019 VOLVO VNX |
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2018 VOLVO VNX |
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Solution K03785558 Monday, November 4, 2019 5:44:00 PM CET ** SOLUTION ** Title Vehicles With An Automated Manual Transmission Model F (AMT-F) With Crawler Gearbox - Diagnostic Trouble Code (DTC) P10C7-97 Crawler Gear Engagement System Blocked Shift To Neutral Position; Vehicle Stuck In Limp Mode Or Will Not Shift Into Gear Mack Models Mack Model MRU - TerraPro , TE - TerraPro , AN - Anthem , CHU - Pinnacle, Axle back , CXU Pinnacle, Axle front , GR - Granite , GU - Granite , PI - Pinnacle Volvo Models Volvo Model VN , VNL , VNR , VNX , VAH , VHD Emission Standard Emission Standard US17+OBD16 , US17+OBD18 , US17+OBD19 Engine family Engine family 11L Engine , 13L Engine , MP7 , MP8 Transmission Transmission AMT-F With Crawler Gears , AMT-F With Crawler Gears ** SOLUTION ** Cause Chassis equipped with an AMT-F may log DTC P10C7-97, accompanied by the vehicle going into limp mode or possibly not being able to engage a gear. These symptoms may be intermittent. The crawler gear is engaged by moving the shifter to a forward position in the gearbox. The shifter has an angled ramp cut on it that presses a plunger on the EVU (Extension Valve Unit) to indicate that the unit has been engaged. If this plunger sticks and does not move to the extended position indicating the crawler shifter actually moved to the Neutral position the unit will think the shifter is still engaged and it was unable to shift to neutral. Solution 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 4320-08-03-49 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: 1.1.1. Remove the EVU from the upper right side of the extension section. 1.1.2. Manually manipulate the plunger. 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. 1.1.3. 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. Solution visibility Dealer distribution Function(s)/component(s) affected Function affected engagement , Transmission Components Function Group Function Group 43 gearbox Customer effect Main customer effect diagnostics/methodology , efficiency/abnormal behavior Noise hissing noise , blowing noise Fault Codes And Error Codes OBDII Diagnostic Trouble Codes (P, U, B Format) P10C7-97 Conditions Vehicle operating mode Frequency of occurrence of problem Location of problem Administration Shifting , during disengagement , during engagement random underneath cab Author UT9268H Dealer ID UT9268H Last modified by RU4469V Creation date 27-09-2019 19:09 Date of last update 22-10-2019 21:10 Review date 31-12-2019 00:12 Status Published NA_Reviewer UT9268H NA_Author_Group GTT Variantes Kola 5XX - PTO TRANSMISSION MOUNTED ADM. RWX - TRANSMISSION PTOTRA-S - SINGLE PTO TRANSMISSION , PTOTRA-D - DOUBLE PTO TRANSMISSION F SERIES - AT2612F - VPT AUTOMATED TRANSMISSION 2600NM 12SPEED , F SERIES - ATO2612F - VPT AUTOMATED TRANSMISSION 2600NM OVERDRIVE RTX - AUTOMATIC GEARBOX TRA-AMT UNCONTROLLED COPY. Printed document is for temporary use only and should not be retained.