JLTV COMPREHENSIVE EXAM 2026 QUESTIONS AND
ANSWERS SCORED A+
✔✔Function of the two top buttons on the Lighting MUX panel - ✔✔Clearance lights +
Headlights
Press once to activated clearance, twice for headlights
✔✔Function of the second row of buttons on the Lighting MUX panel - ✔✔White light,
and Black out
✔✔Function of the third row of buttons on the Lighting MUX panel - ✔✔Dome lights
✔✔Function of the bottom row of buttons on the Lighting MUX panel - ✔✔Dash light
dimmer
✔✔System MUX Panel consists of what? - ✔✔Fording mode, CTIS off, L and H T-Axle,
Axle locks up and down, De-ICER, Exhaust Brake, High Idle
✔✔Fault Code Index provides what? - ✔✔Provides information related to codes found
on the DSDU
✔✔Four parts of fault code index - ✔✔Initial set up, Fault code index, Fault severity,
Fault index Tables 1 and 2
✔✔Max Vehicle Speed - ✔✔76 mph
✔✔Operating in cold climates you should... - ✔✔Use de-icer to remove ice, high idle for
25 minutes, be cautious using CTIS, shut the CTIS off when temp is below 32 degrees.
Drive in 3rd gear for 3-5 miles to warm up drive lines.
✔✔Highway setting, how many axle locks? - ✔✔0
✔✔CC setting, how many axle locks? - ✔✔1
✔✔Mud, sand, snow (MSS), how many axle locks? - ✔✔2
✔✔Emergency, how many axle locks? - ✔✔2 (3rd is set manually)
✔✔Characteristics of Fording - ✔✔-Suspension rises to fording height
-Limited at 10 mph
-Fan shuts off
✔✔Max fording height with kit - ✔✔60 inches
, ✔✔Combat Override Characteristics - ✔✔-Tool for educated operator
-Disables neutral start
-Bypasses interlocks
-Connects silent watch or arctic kit batteries
✔✔Emergency Ingress properties - ✔✔-Used when operator is trapped
-Use ingress tool located in down truck
-Insert ingress tool on combat lock shaft and rotate
✔✔Suspension Lock out Braces are used when? - ✔✔Use Suspension Lock-out braces
any time maintenance is being conducted.
✔✔PMCS Before - ✔✔Performing system checks and vehicle functions
✔✔PMCS During - ✔✔Inspect operation of all components as vehicle is operating
✔✔PMCS After - ✔✔Verify all fluids
✔✔PMCS Monthly - ✔✔Supported by daily PMCS and focuses on important
components.
✔✔Draining the air system - ✔✔· Purges air from tanks
· Prevents moisture from causing problems with
check valves
.-Located at back of truck, just. under solenoid bank on right
· Drain daily after use
✔✔Air filter Maintenance - ✔✔-Service life is 2 years
-Service life in dusty environment, 1 year
-Inspect every operation on DSDU
-Inspect monthly
✔✔Mushroom thing on top of Air-filter - ✔✔Pre-c, I mean, Pre-cleaner
✔✔Cabin Air Filter - ✔✔Located on P/S left of engine
✔✔4 air systems - ✔✔Cabin Air Filter, Pre-cleaner, Air filter, Air re-circulation Filter
✔✔Electronics Box Filter - ✔✔Found on UTL varient
-includes a panel to cover before fording
✔✔Fuel System Priming - ✔✔Prime pump in rear
ANSWERS SCORED A+
✔✔Function of the two top buttons on the Lighting MUX panel - ✔✔Clearance lights +
Headlights
Press once to activated clearance, twice for headlights
✔✔Function of the second row of buttons on the Lighting MUX panel - ✔✔White light,
and Black out
✔✔Function of the third row of buttons on the Lighting MUX panel - ✔✔Dome lights
✔✔Function of the bottom row of buttons on the Lighting MUX panel - ✔✔Dash light
dimmer
✔✔System MUX Panel consists of what? - ✔✔Fording mode, CTIS off, L and H T-Axle,
Axle locks up and down, De-ICER, Exhaust Brake, High Idle
✔✔Fault Code Index provides what? - ✔✔Provides information related to codes found
on the DSDU
✔✔Four parts of fault code index - ✔✔Initial set up, Fault code index, Fault severity,
Fault index Tables 1 and 2
✔✔Max Vehicle Speed - ✔✔76 mph
✔✔Operating in cold climates you should... - ✔✔Use de-icer to remove ice, high idle for
25 minutes, be cautious using CTIS, shut the CTIS off when temp is below 32 degrees.
Drive in 3rd gear for 3-5 miles to warm up drive lines.
✔✔Highway setting, how many axle locks? - ✔✔0
✔✔CC setting, how many axle locks? - ✔✔1
✔✔Mud, sand, snow (MSS), how many axle locks? - ✔✔2
✔✔Emergency, how many axle locks? - ✔✔2 (3rd is set manually)
✔✔Characteristics of Fording - ✔✔-Suspension rises to fording height
-Limited at 10 mph
-Fan shuts off
✔✔Max fording height with kit - ✔✔60 inches
, ✔✔Combat Override Characteristics - ✔✔-Tool for educated operator
-Disables neutral start
-Bypasses interlocks
-Connects silent watch or arctic kit batteries
✔✔Emergency Ingress properties - ✔✔-Used when operator is trapped
-Use ingress tool located in down truck
-Insert ingress tool on combat lock shaft and rotate
✔✔Suspension Lock out Braces are used when? - ✔✔Use Suspension Lock-out braces
any time maintenance is being conducted.
✔✔PMCS Before - ✔✔Performing system checks and vehicle functions
✔✔PMCS During - ✔✔Inspect operation of all components as vehicle is operating
✔✔PMCS After - ✔✔Verify all fluids
✔✔PMCS Monthly - ✔✔Supported by daily PMCS and focuses on important
components.
✔✔Draining the air system - ✔✔· Purges air from tanks
· Prevents moisture from causing problems with
check valves
.-Located at back of truck, just. under solenoid bank on right
· Drain daily after use
✔✔Air filter Maintenance - ✔✔-Service life is 2 years
-Service life in dusty environment, 1 year
-Inspect every operation on DSDU
-Inspect monthly
✔✔Mushroom thing on top of Air-filter - ✔✔Pre-c, I mean, Pre-cleaner
✔✔Cabin Air Filter - ✔✔Located on P/S left of engine
✔✔4 air systems - ✔✔Cabin Air Filter, Pre-cleaner, Air filter, Air re-circulation Filter
✔✔Electronics Box Filter - ✔✔Found on UTL varient
-includes a panel to cover before fording
✔✔Fuel System Priming - ✔✔Prime pump in rear
