The Isuzu N Series represents a robust line of light commercial vehicles renowned for their durability, reliability, and fuel efficiency, making them a preferred choice for applications such as last-mile delivery, construction, and municipal services. Equipped with the 4HK1 engine, a 4-cylinder, inline, turbocharged diesel displacing approximately 5.2 liters, these trucks offer a compelling blend of performance and operational economy. Their versatile chassis configurations and substantial Gross Vehicle Weight Ratings cater to a wide array of vocational needs, underscoring the N Series' reputation as a dependable workhorse in the commercial segment.
This workshop and service manual provides comprehensive coverage of the Isuzu N Series, with a specific focus on the 4HK1 engine's electronic control system. It offers in-depth guidance on engine control system diagnosis and repair, including detailed troubleshooting procedures for a wide range of Diagnostic Trouble Codes (DTCs) from 11 to 65. The manual is designed to assist owners, mechanics, and technicians in accurately identifying and resolving issues related to engine wiring harnesses, sensor circuits, actuator circuits, and ECU communication, ultimately ensuring optimal performance, emissions compliance, and longevity of the vehicle.
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.
Syntom 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
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.
Syntom 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
