NHTSA ID Number: 10117630
Manufacturer Communication Number: 167-B1418-12
TSB/Document Date: 2017-09-14
Summary
SB-14-012 A subject vehicle may exhibit an illuminated check engine lamp with DTC (Diagnostic Trouble Code) P0421 (Catalyst efficiency below threshold). The engine ECU may falsely detect an issue with the ATC (After Turbo Catalyst) with the current ECU software. If DTC P0421 is stored in the engine ECU, reprogram the ECU to the latest software level prior to suspecting a fault with the ATC.
Group:
Bulletin No.:
Issue Date:
TECHNICAL
11-Engine
SB-14-012
07-15-2014
SERVICE BULLETIN
15MY Conventional Truck – False P0421 DTC Setting in the Engine ECU
Supersedes TT-14-014 dated 6-04-2014
OVERVIEW
A subject vehicle may exhibit an illuminated check engine lamp with DTC (Diagnostic Trouble Code) P0421
(Catalyst efficiency below threshold). The engine ECU may falsely detect an issue with the ATC (After Turbo
Catalyst) with the current ECU software. If DTC P0421 is stored in the engine ECU, reprogram the ECU to the
latest software level prior to suspecting a fault with the ATC.
NOTE: This procedure is provided as technical information and is not an authorization for a warranty repair.
SUBJECT VEHICLES
2015 model year Hino Conventional NE8J, NJ8J, and NV8J trucks equipped with a J08 engine.
REPAIR PROCEDURE
1. Connect a battery charger to the vehicle and your laptop to maintain a proper state of charge during the
reprogramming sequence.
2. Verify that the DXII has software version 1.1.14.25 (released July 14 th, 2014) or later.
3. Turn the starter switch to the “ON” position. Update the Engine ECU to the latest software level using the
Hino Diagnostic eXplorer II (Hino DX2). Refer to the following table for the appropriate software part number
for the application.
SOFTWARE INFORMATION
Description
New Software Part No.
15MY J08EVC
15MY J08EVB
89663E3650F or above
89663E3660F or above
4. Proceed to the final inspection section to complete this Technical Service Bulletin (TSB).
FINAL INSPECTION:
1. To complete this software update procedure, review the TSB and confirm the following:
When reprogramming the Engine ECU, DTC’s may have inadvertently been set in other control
modules. Using the Hino DX2, ensure all codes have been cleared from all modules and the MIL is
not illuminated prior to releasing the truck back to the customer.
Page 1 of 2
Vendor Ref.: HMM-140717-J1
Group:
Bulletin No.:
Issue Date:
TECHNICAL
11-Engine
SB-14-012
07-15-2014
SERVICE BULLETIN
NOTE: This procedure is provided as technical information and is not an authorization for a warranty repair.
CLAIM APPLICATION:
* Reimbursable in accordance within the terms and policies of the Hino Truck limited warranties.
Engine ECU Software Update:
a) Labor charge: 0.8 hours
b) Warranty code: 86311
c) Trouble code: 98
d) Operation code: 86350AOT
e) Original failed part: 9999999999
Page 2 of 2
Vendor Ref.: HMM-140717-J1
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TSB/Document ID: 167-B1418-12
Replacement Service Bulletin Number:
MFR Communication Date: 2014-07-15
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM:SOFTWARE
MFR Component System:
MFR Component Subsystem:
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