From early throttle-body injection to hybrid diagnostics, Computerized Engine Controls has long been the go-to text in North-American automotive classrooms. The 9th Edition, authored by Steve V. Hatch, brings the series into the modern OBD II era, while the Dick H. King 4th Edition captures the fundamentals of pre-OBD II systems. Which copy belongs on your bench in 2025? Read on for a concise, human-friendly comparison.
Table of Contents
Quick Snapshot
| 9th Edition | 4th Edition | |
|---|---|---|
| Author | Steve V. Hatch | Dick H. King |
| Publisher / Year | Cengage Learning • 2011 | Delmar Publishers • 1994 |
| Pages | 704 | 452 |
| Typical Used Price | 40–50 USD | 15–25 USD |
| Rating | 4.5 ★ (modern reviews) | Not rated (out of print) |
| Core Focus | OBD II, CAN, hybrids, advanced diagnostics | Pre-OBD II fuel & ignition control, early EFI |
Why the 9th Edition Shines in 202
- Current electronics – Covers wideband A/F sensors, CAN messaging, enhanced OBD II, and early hybrid systems.
- Diagnostic workflow – Each chapter ends with step-by-step fault-tree charts mirroring ASE A8 study guides.
- Import & domestic balance – Toyota, Honda, GM, Ford, and Chrysler examples appear side-by-side.
- Learning aids – Full-color schematics, scan-tool screenshots, and review quizzes minimize classroom fatigue.
Bottom Line: If you service 1996-present vehicles or teach an ASE-aligned course, the 9th Edition is the sweet spot.
Where the Classic 4th Edition Still Scores
- Vintage expertise – Explains feedback carburetors, early GM CCC systems, and single-wire oxygen sensors—gold for restoration shops and DIYers.
- Lean style – Fewer pages, larger print, simple block diagrams—less intimidating for absolute beginners.
- Budget friendly – Often available at bargain prices.
Reality Check: It ends before CAN diagnostics, variable-valve timing, and drive-by-wire throttles—features technicians meet every day.
Chapter-by-Chapter Evolution
| System | 4th Edition (1994) | 9th Edition (2011) |
|---|---|---|
| Fuel Delivery | TBI and early multi-port EFI | Sequential and direct injection |
| Ignition Control | Distributor & early DIS | Coil-on-plug, ion-sensing feedback |
| Emissions | EGR and three-way catalyst basics | Wideband A/F sensors, EVAP leak testing |
| Diagnostics | Flash-code reading, breakout boxes | Global OBD II data, Mode 06, scan-tool PIDs |
| Hybrids / Start-Stop | — | Introductory hybrid coverage |
Strengths & Weaknesses at a Glance
| 9th Edition | 4th Edition | |
|---|---|---|
| Strengths | Latest OBD II logic, full-color visuals, ASE-style quizzes | Simple language, great for vintage systems, inexpensive |
| Weaknesses | Higher cost, no post-2015 ADAS or EVs | Outdated tech, monochrome images, no online resources |
Who Should Choose Which Edition?
- Automotive students & instructors – Choose the 9th Edition for alignment with current ASE test plans.
- Working technicians (1996-2024 fleet) – Keep the 9th Edition handy for quick sensor specs and CAN pin-outs.
- Classic-car restorers & hobbyists – The 4th Edition clearly explains carbureted and early EFI setups.
- Budget learners – A used 9th or an inexpensive 4th can offer solid value depending on your vehicle mix.
FAQ
Is Computerized Engine Controls 9th Edition enough for ASE L1 prep?
It covers foundational electronics and OBD II strategy; pair it with an L1 practice guide for advanced case studies.
Can the 4th Edition teach me OBD II diagnostics?
Only the basics. For Mode 06 data, CAN networking, and scan-tool workflows, use the 9th Edition.
Do these books include hybrid-vehicle coverage?
The 9th Edition offers an introductory look at hybrid and start-stop systems; the 4th Edition does not.
