Navistar N9, Diagnostic Manual

Page: 36 / 51

32 1 DIAGNOSTIC TROUBLESHOOTING PROCEDURES
High-Pressure Oil Pump
(HPOP) Test (page 2227).
No: FDP out of
specification: Go to
8.1 Low Fuel Delivery
Pressure (page 120).
No: EGR out of
specification: Go to
SPN 2791 FMI 7 Fault
Code Diagnostics (page
1095).
No: TC1TOP, EBP,
or DPFDP out of
specification: Look
for exhaust restrictions.
Go To Diesel Particulate
Filter (DPF) Inspection
(page 2370), Diesel
Oxidation Catalyst (DOC)
Inspection (page 2373),
Selective Catalytic
Reduction (SCR)
Inspection (Selective
Catalyst Reduction (SCR)
Inspection, page 2375),
and Decomposition
Tube Inspection
(Decomposition Reactor
Tube Inspection, page
2380).
Step 5 Determine if engine will not start specifically during cold ambient temperatures. Decision
Attempt to start engine.
Is engine hard to start, specifically during cold ambient temperatures?
Yes: Go to 3.1 Engine
Hard to Start, Cold
Ambient Temperature
(page 60).
No: Go to Step 6 (page
32).
Step 6 Determine if engine is hard to re-start after being run to operating temperature Decision
A. Run engine to operating temperature.
B. Attempt to re-start engine at operating temperature.
Is engine hard to re-start specifically after being run to operating temperature?
Yes: Go to 3.2 Engine at
Operating Temperature,
Hard to Re-Start (page
62).
No: Go to Step 7 (page
33).