Hino 238 258LP 268 338 Workshop Manual – J08E-VB J08E-VC Engine Repair & Troubleshooting

Description

The Hino 238 258LP 268 338 – Workshop Manual is the repair and troubleshooting manual prepared by Hino Motors Sales U.S.A., Inc. for the HINO 238, 258LP, 268, 338 and 358 series trucks equipped with the J08E-VB or J08E-VC engine. It is not a light maintenance booklet: the bulk of the document is organised around fault codes, system diagrams, ECU pin assignments and step-by-step inspection flowcharts, so a technician can move from a stored trouble code to a measured value without leaving the page. The production codes referenced throughout are NE8J, NF8J, NJ8J and NV8J.

File Details

• Manual type: Workshop manual / troubleshooting manual
• Publisher: Hino Motors Sales U.S.A., Inc.
• Models covered: HINO 238, 258LP, 268, 338, 358
• Engines covered: J08E-VB and J08E-VC
• Production codes: NE8J, NF8J, NJ8J, NV8J
• Language: English
• File format: PDF
• Publication numbers: S7-UNAE10C 2/4 (U.S.A.), S7-CNAE10C 2/4 (Canada)
• Related publications listed in the manual: Chassis Workshop Manual S1-UNAE10A 1/2 and 2/2, J08E-VB and VC Engine Workshop Manual S5-UJ08E10A, Trouble Shooting Workshop Manual S7-UNAE10C 1/4, 3/4 and 4/4

Chapters Covered

The chapter reference chart in the front of this Hino workshop manual maps every service area to its own chapter number, so you can go straight to the system you are working on instead of scrolling through the whole file:

• General Introduction – 1-001
• Trouble Shooting – Components – 2-001
• Trouble Shooting – Electrical Control System – 3-001
• Engine Control System (J08E) – 4-001, covering precautions for diagnosis, system block diagram, system diagram, sensor location, computer (ECU) pin assignment, engine ECU connector, inspection, diagnosis using the PC diagnosis tool, diagnostic trouble code (DTC) table, group sharing the sensor power supply terminal, group sharing the sensor GND terminal, engine basic inspection sheet, and the No DTC procedure
• DEF SCR System (DCU) – 5-001, covering precautions for diagnosis, system block diagram, system diagram, sensor location, computer (DCU) wire harness connector pin assignment, signal check harness, inspection, malfunction indicator light illumination pattern, diagnosis using the PC diagnosis tool and the full DCU diagnostic trouble code table
• Burner Control System (BCU) – 6-001
• Brake Control System – 9-001 (ABS: Hydraulic, E version) and 9-002 (ABS: Full Air)
• Vehicle Control System (VCS) – 11-001
• CAN Communication – 12-001
• DX Manual – DX01-001, DX02-001, DX03-001, DX04-001, DX06-001, DX07-001

Inside the Engine Control System chapter the manual walks the complete diagnostic route for the J08E: how each sensor and actuator is wired, which ECU pins feed it, what the trouble code means, which conditions set it, what the reset condition is, what the vehicle does when the code is stored, and then a numbered inspection procedure with tester connections and standard values at each step. The DEF SCR chapter repeats that structure for the dosing control unit, working through the ambient air temperature sensor, DEF tank level and temperature sensors, DEF pump, reverting valve, DEF injector, DEF pressure sensor, NOx sensors, the SCR inlet exhaust gas temperature sensor and the coolant shutoff valve, with CAN communication faults handled separately. Because every code is followed by its own inspection flowchart rather than a generic list, the same Hino 238 258LP 268 338 workshop manual takes you from symptom to fault code to measured value in one continuous sequence.

Diagnostic Trouble Code Coverage

The engine side of the manual indexes a very long list of powertrain codes, each with its own section number so you can jump directly to it. Typical entries include fuel rail pressure sensor and common rail pressure faults such as P0088 and P119F, intake throttle and DC motor circuits such as P2100, P2101 and P2103, EGR valve and EGR cooler faults such as P1458, P1459 and P2457, VNT actuator and nozzle position faults such as P226C, P22D3, P2563, P2564 and P2565, DPF and regeneration codes such as P200C, P244A, P244B, P2459 and P2463, injector driver circuits from P2146 through P2151, accelerator pedal position sensor codes P2120, P2122, P2123, P2127, P2128 and P2138, exhaust gas temperature sensor codes for the DOC inlet and outlet, and CAN communication codes such as U0073, U010A, U010C, U010E, U029D, U029E, U02A2, U1001, U110A and U111E. Each entry sets out the technical description, the conditions that must be met before the code is judged, the judgement criteria, the reset condition, any warning lamp or output restriction, the symptoms on the vehicle, pre-inspection and after-inspection work, and the estimated failure factors, before the numbered inspection procedure begins.

Emission Control, Brakes and Vehicle Systems

Because these trucks run aftertreatment hardware, the DEF SCR and burner chapters are treated as first-class material rather than an appendix. The DCU chapter covers reductant delivery performance, DEF pressure and leak testing, reverting valve operation, tank heater valve operation, DEF quality and concentration faults, NOx sensor heater performance and the associated CAN communication codes. The Burner Control System chapter supports the burner-side diagnostics that feed the DPR regeneration strategy, and the brake control chapters split hydraulic ABS and full air ABS into separate chapter numbers so you land on the right system for the truck in front of you. Vehicle Control System and CAN Communication chapters cover the chassis-side networks and the diagnostic tables used to isolate a faulty line when several communication codes appear at once.

How the Manual Is Built for Actual Work

Every fault-code section follows the same working logic: what the system does, what a malfunction looks like, what has to be true before the ECU will judge the fault, how long the condition must persist, what clears it, and what the driver would notice. Only then does the inspection procedure begin, and each step is written as a measurable check rather than a suggestion. Sensor resistance and voltage ranges, standard values, wiring harness continuity checks, signal check harness terminal identifiers, connector pin numbers and reference illustrations are all included where the procedure calls for them, so the diagnostic process stays repeatable between technicians and between shifts.

Who This Manual Suits

Fleet workshops running HINO 238, 258LP, 268, 338 or 358 trucks with J08E-VB or J08E-VC power will find the engine management, aftertreatment and communication diagnostics usable as a day-to-day reference. Independent diesel technicians get the same ECU pin assignments, DTC conditions and inspection sequences the franchise tooling assumes. Owners and operators who maintain their own equipment can use the engine basic inspection sheet and the system diagrams to understand what a fault code is actually reporting before parts are ordered.

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Instant PDF Delivery

This Hino 238 258LP 268 338 workshop manual is supplied as a PDF and is available immediately after checkout, with no shipping and no waiting for a courier. Open it on a laptop in the service bay, a tablet under the hood or a phone at the roadside, search the code you are chasing, and print the pages you want to keep next to the truck. If you are diagnosing a stored fault, verifying an ECU pin, or tracing an EGR, VNT, DPF or DEF SCR problem, the procedure, the wiring reference and the standard value are already in the file.