Check Parked Regen Inhibitors - Navistar MaxxForce DT Diagnostic Manual

DIAGNOSTIC MANUAL
1. Turn ignition switch ON, engine OFF.
2. Using EST with ServiceMaxx™ software, load the Aftertreatment session.
3. Verify all listed Inhibitors are displaying Not Inhibited.
Checks
AFT Regen Inhibit status
Red Stop Alert lamp
Regen inhibit switch
PTO enable switch
PTO switch
Parking brake switch
Brake Pedal switch
Accelerator Pedal
Position
Clutch Pedal Switch
Transmission Position
If no inhibitors and a Regen is needed, go to the following Parked Regen Checks.
Parked Regen Checks
During a Parked Regen the engine speed will ramp up to 1200-1800 rpm.
Typical readings:
• ETV: 80% (closed).
• EGR Position: 0% (closed)
• DOCIT: 482 - 572°F (250-300°C)
• DOCOT: 1112 - 1202°F (600–650°C) (after 5-10 minutes)
• DPFOT: 1022 - 1112°F (550–600°C) (after 10-15 minutes)
• DPFDP: Decreasing steadily once DPFIT and DPFOT are steady and above 1022°F (550°C).
Using EST with ServiceMaxx™ software, open the Aftertreatment session. Start a Parked Regen and
monitor signals.
154
Table 183 Check Parked Regen Inhibitors
Expected Results Comment
Not Inhibited If inhibited, correct the cause. Check switches and any
DTC that may be causing the Regen inhibit.
Off If On, Regen can't be run. Go to appropriate aftertreatment
system diagnostics section in this manual.
Off If On, turn switch Off. If switch does not turn Off, then
diagnose circuit fault.
Off If On, turn switch Off. If switch does not turn Off, then
diagnose circuit fault.
Off If On, turn switch Off. If switch does not turn Off, then
diagnose circuit fault.
On If Off, set parking brake, if switch does not turn On, then
diagnose circuit fault.
Off If On and foot is off pedal, then diagnose circuit fault.
0% If above 0%, and foot is off pedal, then diagnose circuit
fault.
Off If On and foot is off pedal, then diagnose circuit fault.
Park or Neutral If engaged, disengage, or diagnose circuit fault.
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