John Deere PowerTech Plus 4.5L and 6.8L Diesel Engine Level 14 Denso HPCR Component Manual (CTM320)

Engine covered

This component manual (CTM320, dated 17JUL09) is written for John Deere's PowerTech Plus 4.5L and 6.8L diesel engines built with the Level 14 electronic fuel system using a Denso high-pressure common rail (HPCR). Base engine mechanical repair is covered separately, in CTM104.

What this manual covers

This manual is entirely about the electronic fuel, air and engine control systems unique to the Level 14 Denso HPCR setup - not general engine teardown. It opens with engine identification (serial number plate, OEM option codes, emissions certification labels and application charts) and fuel/lubricant/coolant guidance before getting into the electronic systems themselves.

Table of Contents

• Section 01 - General - safety, engine identification, fuels/lubricants/coolant, fuel system identification
• Section 02 - Repair and Adjustments - electronic fuel system, electronic air system, electronic engine control repair and adjustment
• Section 03 - Theory of Operation - electronic fuel system, electronic air system, electronic control system operation
• Section 04 - Diagnostics - observable diagnostics and tests, trouble code diagnostics and tests
• Section 05 - Tools - electronic fuel/control system repair tools, diagnostic service tools
• Section 06 - Specifications - repair specifications, diagnostic specifications

Good to know

Also referenced: the PowerTech Plus 4.5L/6.8L base engine manual, the alternators and starter motors manual (CTM77), and the OEM engine accessories manual. This edition includes a change log noting updates through April 2009, including an added cylinder leak-down test kit and a corrected torque value for the EGR temperature sensor.