Symptom 2 (Medium Duty): Engine No Start / Starts And Stalls - Navistar MaxxForce DT Diagnostic Manual

3.3. SYMPTOM 2 (MEDIUM DUTY): ENGINE NO START / STARTS AND STALLS

NOTE – Before beginning the following step-based diagnostics, perform all vehicle operational checks
page 5.
Step
1 Check for an exhaust system restriction by performing the following
Exhaust System Restriction Test:
To prevent damage to the starter, if engine fails to
start within 20 seconds, release ignition switch,
and wait 2 to 3 minutes to allow starter motor to
cool.
1. Turn ignition switch to ON position.
2. Using EST with ServiceMaxx™ software, go to
3. Select the record snapshot icon from the toolbar.
4. Crank the engine for a maximum of 20 seconds. If
5. Stop recording.
6. Use the playback feature in ServiceMaxx™ and graph
7. Record maximum TC1TOP signal value reached from
8. Verify DPFDP and TC1TOP (actual) are within
Are DPFDP and TC1TOP signal values within specification?
Action
CAUTION
Sessions > Performance and record Turbocharger 1
Turbine Outlet Pressure (TC1TOP) Key-On Engine-Off
(KOEO) signal value.
engine does not start, wait 2 to 3 minutes and crank
engine again for a maximum of 20 seconds.
TC1TOP, and Diesel Particulate Filter Differential
Pressure (DPFDP) signal values.
NOTE — To calculate TC1TOP (actual), subtract
TC1TOP KOEO signal value recorded in step 2 from
maximum TC1TOP signal value reached in step 7.
snapshot, and calculate TC1TOP actual (See Table 21,
page 18).
specification. DPFDP signal value should be less than
1 psi (7 kPa), and TC1TOP (actual) should be less than
5 psi (34 kPa).
https://www.truck-manuals.net/
DIAGNOSTIC MANUAL
Decision
Both DPFDP and TC1TOP
signals High: Go to step 2
TC1TOP signal High Only:
Go to step 3
Neither DPFDP or
TC1TOP signal High:
Go to Hard Start and No
Start Diagnostics section
in Engine Diagnostic
Manual. After repairs are
complete, go to step 8.
17