This collection contains the following 3 manuals:
Isuzu 4HK1-TC service training manual
Isuzu N series 4HK1 engine control system
Isuzu 4HK-1 and 6HK-1 ENGINE FUEL SYSTEM CE APPLICATIONS

Manual 1 description:
Isuzu 4HK-1 and 6HK-1 engine fuel system CE applications.
This manual explains fuel system and electronics of these models engines fitted to excavators. It has multible circuit diagrams of sensors, wiring, mechtronics, and explantions of there relationships or processes.

Manual 2 description:
Isuzu N series 4HK1 engine control system workshop manual.
This manual will assist diagnosing and repairing the control system on your engine.

Manual Index:
Precautions on service
Function and operation
Componant layout
Circuit diagram
Statergy based diagnostics
Functional check list
Hearing diagnostic
On-board diagnostic system check
Inactive check engine lamp
Check engine lamp remains active
Engine cranks but will not run
Diagnosis with Tech 2 scan tool
Diagnosis chart
DTC11-no signal CKP sensor
DTC13-TCV fault
DTC14-PUMP ROM fault
DTC15-Pump Cam sensor short break fault
DTC16-No signal Pump cam sensoe
DTC21-ECT sensor fault excetera.
DTC11 to DTC65 faults covered.
Symtom diagnosis chart
Hard starting
Vehicle speed variation
Lack power or faulty respomse
Unstable idling
Engine not stall
Starter motor does not run
QOS system does not operate
Excessive black smoke in exhaust
Excessive white smoke in exhaust
Noisy engine
Nasty smell
Poor fuel economy
Excessive oil consumption
Large engine vibration
special tools

Manual 3 description:
Isuzu 4HK1-TC service training manual'
It explains engine mechanical features and the control system and diagnosis.
This manual covers 2005 NPR and NQR models.
This training manual is a must if your service technician needs to understand how systems work in this engine. Repairs cannot be achieved if you do not have a thourough understanding.