CMI-02012024-A

From:
Sent:
To:
Thursday, February 1, 2024 4:56 PM
@navistar.com;
@Navistar.com;
Subject:
@Navistar.com;
B6.7 EPA24/GHG24 - Oil Pressure Sensor In Range High (FC 435 followed by 143 and
415) Meeting notes
Good Afternoon,
Thank you all for your participation on today’s call. As promised attached is an updated one-pager presentation with
the details we reviewed in regards to the EPA 24 B6.7 oil pressure fault codes. I’ve also attached a excel list of the
current ESN range as of 2/1/2024.
Thanks,
Customer Quality Business Manager
Cell Phone:
9377 US Hwy 301 North
Whitakers, NC 27891
CONFIDENTIALITY NOTICE: This e-mail, including any attachments, is for the exclusive and confidential use
of the intended recipient(s). If you are not an intended recipient, please do not read, distribute or take action in
reliance upon this message. If you have received this in error, please notify the sender immediately by return
e-mail and promptly delete this message and its attachments from your computer system.
1
Updated: 2/1/24
BACKGROUND
• EPA24 change from an oil pressure switch to a sensor combined with a wiring harness
and diagnostic change have been made. (All changes noted on Walk-Around slide)
• Sensor and diagnostic/tuning changes were field tested
• ALL B6.7 EPA24/GHG24 Engines are impacted
• FC’s observed: 435 (Amber), 415 (Red) and 143 (Amber)
• 1 confirmed fault code related issue reported from Navistar
• ESN: 99215832 in transit (Salt Lake City,UT)
FAULT CODE/FAIL MODE
• Fault Code 435, 143 and 415 being generated. Fault progression on subsequent slide.
• 435 - Oil Rifle Pressure - Data Erratic, Intermittent, or Incorrect
• 143 - Oil Rifle Press - Data Valid But Below Normal Operating Range Moderately Severe Level
• 415 - Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Most
Severe Level
• While fault codes above suggest low oil pressure, engines have adequate oil pressure
and no damage has occurred. When FC 435 is active, diagnostic triggers an incorrect
default value leading to these additional fault codes.
Oil Pressure Sensor In Range High
(FC 435 followed by 143 and 415)
ESCALATION:
Completed
• Eliminated wiring harness, ECM, and Oil Pressure Sensor malfunction as
a likely cause .
• Supplier part analysis completed on 2 returned sensors – NTF
• Part swaps and measurements completed with wiring harnesses
and ECMs - NTF
• Evaluated L9 telematics and warranty claims. No similar issues noted,
suggesting issue does not follow the sensor – same PN used on L9
• Failure mechanism reviewed by CMI Engineering – In Range High
diagnostic limit exceeded - Cause Identified. Default value also set too
low. (See Fault Progression slide)
• Internal review with new oil pressure values created on 1/30/2024
NEXT STEPS
• Draft and submit Change Request to kickoff the release work
• Continue documenting OEM and Field failure reports
• This data will be utilized to calculate estimated failure rate.
• Service Engineering working on field communication/TSB
CURRENT STATE
• Engineering release work has been kicked off to implement diagnostic changes on 1/29/24
• Current suspect population of 3135 engines shipped to Navistar. This volume will
grow leading up to implementation.
ROOT CAUSE AND GOAL STATEMENT
• Eliminate nuisance fault codes (435, 143, 415)
1
Cal Settings vs Dyno Fault Condition
72.8 psi
502 vs 496 kPa
2
Fault Progression
FC 435 (Amber) occurs due to ‘high’
oil pressure relative to calibration
setting, in range high failure
Engine Shutdown
Protection Enabled
No
Engine operates with
Red warning lamp
active
Oil Pressure value in the
ECM drops to default
value of 101 kPa
5 seconds later, diagnostics for low (FC143 - Amber)
and severely low oil pressure (FC415 - Red) log due
to the default value
Yes
30 Second Shutdown
timer initiated, Red
lamp flashes
3
Field Test Data
4
4
EPA 24 Engine Walk-Around
Electronic Hardware
Lube and Cooling
• Cyber Security Enhancements
• Oil Pressure Sensor replaces pressure
switch to improve health monitoring of
lube system
• Engine harness change
Software & OBD
• ECM upgrade - bootloader
Phase 35 software
• OBD Regulatory required
improvements
Air Handling
• Enhanced Turbo actuator for improved
vibration capability and cooling
controls capability via revised chipset
• Upgraded Turbo Bearing Housing
Aftertreatment
• New Mixer
Ratings and Emissions
Customer TCO Improvement
• Dynamic Maintenance Monitor
Base Engine
• Low Ratings Changes:
• 200 hp/520 ft-lb/2600 rpm (eliminate) =
200hp/600ft-lb/2600rpm (new rating)
• 220 hp/520 ft-lb/2600 rpm (eliminate) =
220 hp/600 ft-lb/2600 rpm (existing)
• 240 hp/560 ft-lb/2600 rpm (eliminate) =
240hp/600ft-lb/2600rpm (new rating)
• New Edge Molded Oil Pan Gasket
reduces risk of leaks
Confidential
5