TM 5-2420-230-24-1
(11) Remove from safety stands and road test.
Section IV. Troubleshooting.
3-11. TROUBLESHOOTING INTRODUCTION.
This section contains step-by-step procedures for identifying, locating, isolating, and repairing equipment malfunctions.
Troubleshooting is presented in a series of steps until the fault is fixed. In most cases, the step asks a question. It is followed by
what to do if the condition is not met. If the condition is met, proceed to the next step.
3-12. TROUBLESHOOTING PROCEDURES.
a. General.
The Fault Symptom Index (Table 3-5) lists common malfunctions by vehicle system followed by tests, inspections, and
corrective actions.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify the supervisor.
Before using troubleshooting tables, be sure all applicable Preventive Maintenance Checks and Services (PMCS) have
been performed. Perform tests, inspections, and corrective actions in the order listed. Try to return the vehicle or
component to operation after each test, inspection, and corrective action has been performed.
While doing troubleshooting, refer to any figures, foldouts, and publications mentioned in the text. These figures,
foldouts, and additional publications will help isolate and locate troubles and get the vehicle back in service as quickly as
possible. Foldout schematics are found in the second volume of this manual.
b. Measurements Required for Troubleshooting.
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical
circuits, a direct short may result. Damage to equipment and injury or death to personnel may occur.
Use properly sized test leads and ensure care is used when checking for resistance, continuity, or
voltage at connectors, or damage to equipment may result.
(1)
Resistance measurements.
(a)
Connect red test lead to Volt-Ohm input connector and black lead to COM input connector on meter.
(b)
Set function/range switch to desired Ohm position. If the magnitude of the resistance is not known, set the
switch to the highest range, then reduce until satisfactory reading is obtained.
