Operational Checkout Procedures; Preliminary Vehicle Operational Checkout Procedure - Navistar N9 Diagnostic Manual

1 DIAGNOSTIC TROUBLESHOOTING PROCEDURES

Operational Checkout Procedures

1.0 - Preliminary Vehicle Operational Checkout Procedure

Step 1 Inspect fuel level, quality, and fuel system.
Perform Fuel Level Inspection (page 2352), Fuel System Inspection (page 2349), and
Fuel Quality Inspection (page 2350).
Are fuel level and quality to specification, and did fuel system pass inspection?
Step 2 Inspect batteries, electrical system, and connections.
Perform Batteries and Electrical System Inspection (page 2393).
Are batteries, electrical system, and connections in good condition, tight, not
corroded, and is battery voltage in specification?
Step 3 Inspect air intake system for damage or restrictions.
Inspect Charge Air Cooler (CAC), Engine Throttle Valve (ETV), Mass Air Flow
(MAF) sensor, air filter, intake piping, clamps, and connections for damage or
restrictions.
Are air intake system components damaged or restricted?
Step 4 Inspect exhaust system for damage or restrictions.
Inspect Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF),
Selective Catalyst Reduction (SCR) catalyst, exhaust brake, and exhaust
piping for damage or restrictions.
Are exhaust system components damaged or restricted?
23
Decision
Yes: Go to Step 2.
No: Repair fuel system fault.
After repairs are Operational
Checkout Procedures
complete, retest for original
problem.
Decision
Yes: Go to Step 3.
No: Repair broken, loose, or
corroded electrical system
connections or components.
Charge batteries to 12.6
volts. After repairs are
complete, retest for original
problem.
Decision
Yes: Repair air intake
system damage or
restrictions. After repairs are
complete, retest for original
problem.
No: Go to Step 4.
Decision
Yes: Repair exhaust system
damage or restrictions. After
repairs are complete, retest
for original problem.
No: Go to Step 5.