[PDF] SERVICE MANUAL - service-engine This manual covers the electronic control model Common Rail system with HP3/HP4 pump for the ISUZU 4HK1/6HK1 type engines which are used to ELF and GM 560 series respectively. Complex theories, special functions and components made by manufacturers other than DENSO are omitted from this manual. Isuzu Engine 4HK1-6HK1 Workshop Service Repair Manual Instant download Isuzu Engine 4HK1-6HK1 Workshop Service Repair Manual. This manual content all service, repair, maintenance, troubleshooting procedures for Isuzu Engine. All major topics are covered step-by-step instruction, diagrams, illustration, wiring schematic, and specifications to repair and troubleshoot.