JalTool Motor Grader Diagnostic Tool for Engine, Hydraulic and Blade Control Faults
Motor graders rely on engine power, transmission control, hydraulics, articulation steering and blade functions to create accurate road surfaces. Modern graders use electronic control units to manage the engine, powertrain, hydraulic valves, joystick inputs, blade position sensors, display systems and emissions equipment.
When a grader develops slow blade movement, poor steering response, a transmission warning or reduced engine power, the cause may be electronic, hydraulic, mechanical or related to CAN communication. The JalTool Motor Grader Diagnostic Tool helps workshops and mobile technicians diagnose supported off-highway equipment through a structured scan, test and verification workflow.
Common Motor Grader Fault Symptoms
- Blade lift, side-shift or circle-drive movement is slow
- Articulation or steering responds incorrectly
- Transmission shifts harshly or does not engage correctly
- Hydraulic pressure or oil-temperature warnings appear
- Engine enters reduced-power mode under load
- Joystick commands are intermittent or unavailable
- Operator display shows controller communication errors
- DPF, SCR, AdBlue or NOx warning codes are stored
One symptom can have several possible causes. For example, slow blade movement may be caused by hydraulic pressure loss, a valve problem, a sensor fault, controller command, wiring issue or an engine derate condition.
What Can JalTool Check on a Supported Motor Grader?
Available functions depend on the manufacturer, model, production year, engine, ECU and installed system. On supported motor graders, JalTool may provide access to the following diagnostic areas:
| System | Possible Diagnostic Functions |
|---|---|
| Engine ECU | Read supported fault codes, view live data and identify engine-control information |
| Transmission | Inspect supported shift-control faults, speed signals and transmission parameters |
| Hydraulic system | Review supported pressure, temperature, valve and sensor data |
| Blade and circle control | Check supported actuator commands, joystick inputs and position sensors |
| Steering and articulation | Inspect supported steering controllers, angle sensors and communication faults |
| Aftertreatment system | Diagnose supported DPF, SCR, AdBlue and NOx-related systems |
| Service functions | Perform supported resets, calibrations, adaptations and adjustments |
Not every function is available on every machine. Confirm the exact grader model and required procedure through the JalTool Vehicle Coverage page before purchasing.
Recommended JalTool Motor Grader Diagnostic Workflow
1. Record the Equipment Information
Prepare the manufacturer, exact model, serial number, production year, engine model and diagnostic connector details. Note whether the fault occurs during blade operation, road grading, articulation, travel, reversing or high-load work.
2. Inspect Electrical Power and Wiring
Check battery voltage, fuses, grounds, connectors and visible harness damage. Construction-site vibration, dust, water and heat can damage connectors or create poor communication between control units.
3. Perform a Full Supported System Scan
Connect the JalTool Diagnostic Scanner and scan all available electronic systems. Save active and stored fault codes before clearing them. Comparing engine, transmission, hydraulic and steering-controller codes can help identify the primary fault.
4. Review Live Data
Use supported live data to compare engine speed, hydraulic pressure, oil temperature, transmission speeds, joystick inputs, blade-position values, articulation angle and sensor voltages. A value that does not match the actual machine condition should be tested further.
5. Perform Supported Actuator Tests
Where available, actuator tests can help verify solenoids, valves, relays and other electronically controlled components. Secure the grader before testing and follow the manufacturer’s safety instructions. Keep people away from the moldboard, articulation joint, wheels and moving hydraulic components.
6. Repair, Calibrate and Verify
After repairing wiring, replacing a sensor or correcting a hydraulic issue, complete any available calibration or adjustment. Clear fault codes only after the repair, then perform a second scan and save a diagnostic report.
Choosing a JalTool Package for Motor Graders
Workshops that service motor graders together with construction machinery, agricultural equipment and commercial vehicles can review the JalTool Professional Package.
Businesses that work with multiple equipment categories can review the JalTool Complete Diagnostic Package for broader supported coverage.
Workshops focused mainly on trucks and commercial vehicles can consider the Commercial Vehicle Package. The diagnostic interface and connection hardware are available through the JalTool Diagnostic Scanner hardware page.
Confirm Compatibility Before Ordering
A manufacturer name alone does not confirm support for every motor grader, engine, blade controller or hydraulic system. Send the exact model, year, engine, ECU and required function, such as live-data testing, actuator testing, calibration or emissions diagnosis.
For compatibility and package assistance, contact support@jaltool.com or WhatsApp at +84 908 532 146.
Purchase from an Authorized JalTool Source
Before paying for hardware or software activation, verify the seller through the JalTool Authorized Dealer Verification page. Businesses interested in distribution can visit the JalTool Dealer Program.
Important Compatibility Notice
JalTool is an independent diagnostic product and is not affiliated with, sponsored by or endorsed by Cojali or Jaltest. Diagnostic coverage and available functions depend on the manufacturer, model, production year, engine, ECU, installed system and supported procedure. Always confirm compatibility and follow the motor grader manufacturer’s safety instructions before testing.