Navistar N9, Руководство по диагностике

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1 DIAGNOSTIC TROUBLESHOOTING PROCEDURES 23
Operational Checkout Procedures
1.0 - Preliminary Vehicle Operational Checkout Procedure
Step 1 Inspect fuel level, quality, and fuel system. Decision
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?
Yes: Go to Step 2.
No: Repair fuel system fault.
After repairs are Operational
Checkout Procedures
complete, retest for original
problem.
Step 2 Inspect batteries, electrical system, and connections. Decision
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?
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.
Step 3 Inspect air intake system for damage or restrictions. Decision
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?
Yes: Repair air intake
system damage or
restrictions. After repairs are
complete, retest for original
problem.
No: Go to Step 4.
Step 4 Inspect exhaust system for damage or restrictions. Decision
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?
Yes: Repair exhaust system
damage or restrictions. After
repairs are complete, retest
for original problem.
No: Go to Step 5.