Maxxforce Dt, 9 And 10 Aftertreatment System Diagnostics; Start Diagnostics Here: Engine And Aftertreatment System; Operational Checks - Navistar MaxxForce DT Diagnostic Manual

MAXXFORCE ® DT, 9 AND 10 AFTERTREATMENT SYSTEM DIAGNOSTICS

3.1. START DIAGNOSTICS HERE: ENGINE AND AFTERTREATMENT SYSTEM

OPERATIONAL CHECKS

Overview
A properly operating aftertreatment system requires little manual intervention from the operator. Illuminated
warning lamps may indicate a driving or extended idle operation that may not allow successful regeneration
of the aftertreatment system. These illuminated warning lamps may also indicate an engine mechanical or
performance concern.
Tools Required
• Electronic Service Tool (EST) with ServiceMaxx™ software
• Interface cable (RP1210B compliant supporting J1939 and J1708)
NOTE – A frequent regen concern may not be repaired by only performing an Onboard Filter Cleanliness
Test (OBFCT). Perform all steps in the following diagnostic procedure in order to identify root cause
failure.
NOTE – Repair all active fault code(s) other than SPN 3719 (DPF Soot Load) before beginning Engine
and Aftertreatment System Operational Checks.
Operational Checks – Start Aftertreatment Diagnostics Here
Step
1
Verify the following engine systems are in satisfactory condition:
• Engine Oil: Park vehicle on level ground and check oil level.
• Engine Coolant Level: Check coolant level that is indicated on
deaeration tank.
• Intake Air: Inspect air filter gauge, located on air filter housing or
dashboard.
• Electrical System: Inspect batteries and electrical system (engine and
vehicle) for poor or loose connections, corroded terminals, or broken
and damaged wires.
• Exhaust System: Check Aftertreatment and exhaust system for
damage, excessive corrosion, or leaks.
• Fuel level: Check instrument panel fuel gauge, look into fuel tanks to
verify fuel level, and make sure fuel levels are equal in both tanks.
• Fuel quality Obtain a fuel sample, and check for water, waxing, icing,
sediment, gasoline, Diesel Exhaust Fluid (DEF), or kerosene.
• Fuel line routing and condition: With engine OFF, visually inspect
the condition and routing of fuel lines.
Are all of the above engine systems operating as designed?
Action
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DIAGNOSTIC MANUAL
Decision
Yes: Go to step 2
No: Repair
appropriate
engine system
and go to step 2.
5