Navistar N9, Diagnostic Manual

Page: 32 / 51

28 1 DIAGNOSTIC TROUBLESHOOTING PROCEDURES
Step 4 Record snapshot of no start related Key-On Engine-Off (KOEO) Data. Decision
Perform Record Snapshot of KOEO data (page 2113).
Are battery voltage, FDP, ICP, and engine temperature sensor values within
KOEO specifications?
Yes: Go to Step 5.
No: Battery voltage
out of specification:
Repair battery, starting
system, charging system,
or ECM PWR circuit
problem. After repairs
are complete, retest for
original problem.
No: FDP out of
specification: Go to
8.1 Low Fuel Delivery
Pressure (page 120).
No: ICP out of
specification: Go to
SPN 164 FMI 0 Fault
Code Diagnostics (page
1287).
No: One or more engine
temperature sensors
not within 20°F (7°C)
of others after cold
soak: Go to Fault
Code Diagnostics (page
142)for sensor out of
specification.
Step 5 Record snapshot of engine cranking data. Decision
Perform Engine Cranking Test (page 2172).
Are Switch Battery (SWBAT), Engine Speed (rpm), ICP, IPR, FDP, and EGR
within engine cranking specification (page 2403)?
Yes: Go to Step 6.
No, SWBAT or Engine
Speed (rpm) out of
specification: Go to 2.1
Engine Cranks Slow or
Does Not Crank (page
49).
No,: ICP or IPR out
of specification: Go to
CPA High-Pressure Oil