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
Action
Decision
1
Check for an exhaust system restriction by performing the following
Exhaust System Restriction Test:
CAUTION
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
Sessions > Performance and record Turbocharger 1
Turbine Outlet Pressure (TC1TOP) Key-On Engine-Off
(KOEO) signal value.
3.
Select the record snapshot icon from the toolbar.
4.
Crank the engine for a maximum of 20 seconds. If
engine does not start, wait 2 to 3 minutes and crank
engine again for a maximum of 20 seconds.
5.
Stop recording.
6.
Use the playback feature in ServiceMaxx™ and graph
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.
7.
Record maximum TC1TOP signal value reached from
snapshot, and calculate TC1TOP actual (See Table 21,
page 18).
8.
Verify DPFDP and TC1TOP (actual) are within
specification. DPFDP signal value should be less than
1 psi (7 kPa), and TC1TOP (actual) should be less than
5 psi (34 kPa).
Are DPFDP and TC1TOP signal values within specification?
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
https://www.truck-manuals.net/
