Construction equipment diagnostics splits into OEM depth (Cat ET, Komatsu KOMTRAX) and multi-brand breadth (Jaltest OHW, TEXA OHW). This hub maps the landscape — including the proprietary connectors that make equipment cables a category of their own.
Coverage and tool options
| Segment | Systems covered | Recommended tools |
|---|---|---|
| Caterpillar | Full line incl. programming | Cat ET + Comm Adapter 3 |
| Komatsu | Diagnostics + service functions | Jaltest OHW / TEXA OHW; KOMTRAX Plus for depth |
| John Deere | Construction & ag | Jaltest OHW/AGV; Service Advisor for depth |
| Hitachi/Volvo CE/JCB/Case | Diagnostics coverage | Jaltest OHW / TEXA OHW |
| 30+ smaller brands | Read/clear + common tests | Jaltest OHW module |
Getting set up
Start with your fleet mix: Cat-heavy operations buy Cat ET + CA3; mixed-brand operations start with Jaltest CV + OHW module ($3,995 + $795/yr) which also covers their trucks. Cables are the hidden category — the off-highway cable kits map every proprietary connector by brand.
Tools for this job
Jaltest CV + OHW module
One platform for trucks and 30+ equipment brands.
View details →Cat ET + CA3 kit
Full Cat depth — trucks, machines, generators, marine.
View details →OHW cable master kit
Every proprietary equipment connector, labeled and color-coded.
View details →Frequently Asked Questions
Can my truck scanner diagnose construction equipment?
Multi-brand platforms with OHW modules (Jaltest, TEXA) cover 30+ equipment brands. A truck-only scanner without the OHW module won't see most machines — the protocols and connectors differ.
Is Cat ET worth it for a mixed-equipment fleet?
Only if Cat is your dominant brand. Mixed fleets get more per dollar from Jaltest OHW, adding Cat ET later if Cat programming work justifies it. Full logic on the CAT hub.
Do off-highway tools cover agriculture equipment too?
Jaltest splits them: OHW for construction, AGV for agriculture ($795/yr each). TEXA bundles similarly. See the agriculture hub.