On Caterpillar machines — excavators, loaders, bulldozers, or gensets — the ECM (Engine Control Module) plays a central role. It manages injection, engine regulation, sensors, and even some hydraulic functions.
But when this electronic brain malfunctions, the symptoms can be varied, and diagnosing the issue becomes a real puzzle… unless you’re properly equipped.
👉 That’s where Jaltest INFO Web OHW makes a real difference: this online software gives you access to Caterpillar-specific technical data and guides you through ECM fault diagnosis and resolution — in record time.
Common symptoms of a faulty Caterpillar ECM
These are the most frequent issues reported by CAT machine users:
- Check Engine light stays on
- Engine slows down without hydraulic pressure loss
- Engine stuck at low or high RPM
- Intermittent injection problems
- No communication with the ECM via diagnostic tool
In about 60% of cases, the issue is caused by a misread sensor or a software fault in the ECM — not a mechanical failure.
How does Jaltest INFO Web OHW help diagnose a Caterpillar ECM?
âś… 1. Identify Caterpillar ECM fault codes
Examples:
- E-ID:190-3 – Intake air temperature sensor: low voltage
- E-ID:111-1 – Low ECM supply voltage
- E-ID:232-2 – CAN communication fault between engine ECM and hydraulic ECM
💡 In Jaltest INFO Web OHW: enter the fault code → get a description, likely causes, and step-by-step solution.
âś… 2. Access complete Caterpillar ECM wiring diagrams
With interactive views, you can:
- Locate the ECM on specific machines (e.g. 320D, 950H, D6R…)
- Identify each connector, pinout, and expected voltage
- Trace connections between sensors, power supply, and ECM
🎯 Result: You test the right components without unnecessary disassembly.
âś… 3. Follow Caterpillar ECM-specific test procedures
Jaltest INFO Web OHW provides guided sheets to:
- Check electrical continuity between pins
- Test ECM power supply (9–32V depending on model)
- Measure sensor input values at the ECM
- Reset or recalibrate parameters after repair
âś… 4. Get a list of ECM-compatible CAT sensors
The software also provides:
- OEM references
- Normal operating values (range in V, ohms, Hz)
- Tolerances based on temperature or engine load
Example:
Fuel Rail Pressure Sensor
✔ Expected value (engine running): 28,000–35,000 kPa
âś” Voltage: 0.5 V (idle) to 4.5 V (full throttle)
🧪 Real-life case: ECM fault on Caterpillar 320D excavator
🔧 Symptoms: Check engine light + unstable idle + fault code E-ID:94-1
🔧 Diagnosis with Jaltest INFO Web OHW:
- Fault code read
- Engine RPM sensor test → OK
- ECM power supply test: 7.6 V instead of 12 V → ground issue
🔧 Fix: Connector cleaned, fuse replaced, fault code cleared → normal operation restored
Direct benefits for your Caterpillar workshop
| Before Jaltest INFO Web | With Jaltest INFO Web OHW |
| Blindly searching for diagrams | Instant, precise schematics |
| Trial-and-error sensor testing | Clear, guided procedures |
| Diagnosis time: >2 hours | Average time: 30 minutes |
| Risk of wrong diagnosis | Reliable, multi-model data |
| Dependent on scan tool | Usable even without interface |
✅ Conclusion: ECM faults won’t catch you off guard anymore
With Jaltest INFO Web OHW, you have everything you need to work confidently and efficiently on Caterpillar ECM issues.
âś” Save time
âś” Avoid unnecessary part replacements
âś” Reduce stress on the jobsite
đź“ž Request your free trial now in just a few clicks:
đź”— https://agridiaginfo.co.uk/
