Truck Electrical & Diagnostic Repair
Mondak Equipment combines OEM diagnostic software, NEXIQ communication equipment, electrical testing, ECM programming and direct-controller communication capabilities to follow the problem beyond the fault code.
A Fault Code Is a Starting Point. Not Always the Answer.
Modern trucks are good at telling you what the controller sees.
They do not always tell you why it sees it.
A sensor fault may be the sensor, or it may be wiring, a connector, poor ground, voltage problem, communication fault or another condition somewhere else in the system.
The goal is not to clear the code. The goal is to fix what caused it.
Heavy Truck & Vocational Equipment Diagnostics
We work across major truck, engine and powertrain platforms including:
- Mack
- Volvo
- Freightliner
- Western Star
- International
- Peterbilt
- Kenworth
- Cummins
- Detroit
- PACCAR
- Allison and more
Our diagnostic capabilities also extend into specialized, off-highway and European equipment, including Scania and other platforms that may require manufacturer-specific software or connections.
OEM & Manufacturer-Level Diagnostic Software
Mondak maintains a broad library of diagnostic software instead of depending on a single generic scan tool.
Our capabilities include platforms such as:
- Cummins INSITE
- Detroit DiagnosticLink
- PACCAR DAVIE4
- Volvo / Mack Premium Tech Tool
- International Service Diagnostics Solutions
- Navistar Engine Diagnostics
- International Diamond Logic Builder
- International ServiceMaxx
- International NavKal
- Allison DOC
- Bendix ACom
- WABCO TOOLBOX / TOOLBOX PLUS
- Scania SDP3
- Additional OEM and component-specific diagnostic platforms
Depending on the manufacturer and system, these tools can give us access to:
- Active and inactive fault codes
- Live operating data
- Sensor values
- Controller inputs and outputs
- Actuator and functional tests
- Service routines
- Parameters
- Calibrations
- Network diagnostics
- Aftertreatment information
- Transmission data
- Programming functions
The software gives us better information.
It still takes a technician to determine whether that information makes sense.
ECM Programming & Module Replacement
Sometimes diagnosis ends with a controller that actually does need to be replaced.
Mondak has equipment for ECM and electronic control module programming, allowing us to handle more of the job in-house instead of stopping after the failed module is identified.
Our programming and communication equipment includes:
- NEXIQ heavy-duty communication interfaces
- Dimsport New Genius
- Dimsport New Trasdata
- OEM programming software
- Bench and direct ECU communication equipment
- Multi-pin diagnostic equipment
- Additional module programming tools
Depending on the controller and application, that can include:
- ECM programming
- Replacement-module setup
- Calibration installation
- ECU reading and writing
- Calibration and module information transfer
- Controller recovery
- Bench programming
- Direct ECU communication
- Module configuration
- Preserving original ECU information where supported
When the Normal Diagnostic Connector Isn't Enough
Not every truck or piece of equipment arrives with a standard connector that matches the adapter in the diagnostic kit.
Older, imported, specialized and modified equipment can use unusual connectors, or may not have a usable diagnostic connector at all.
Mondak has a multi-pin diagnostic setup that allows us to build the appropriate connection for applicable equipment when a dedicated adapter is not available.
That can be useful on:
- Older equipment
- Imported equipment
- Specialized machinery
- Industrial engines
- Uncommon diagnostic connectors
- Damaged diagnostic ports
- Standalone engines and power units
- Controllers removed from the machine
- Custom or modified equipment
Using the correct wiring information and pinout, we can connect the communication circuits required by the application, including systems such as:
- Power and ground
- CAN High / CAN Low
- J1939
- J1708 / J1587 where applicable
- K-Line and other supported communication circuits
An unusual connector does not automatically end the diagnostic process.
Direct ECU & Bench Communication
Sometimes the machine cannot communicate with the controller normally at all.
A failed, damaged or corrupted ECU may prevent communication through the vehicle diagnostic connector.
When applicable, Mondak can use equipment including Dimsport New Trasdata, New Genius, NEXIQ and bench communication equipment to access the controller another way.
That may allow us to work directly with the ECU for diagnosis, programming, information transfer or recovery where supported.
Sometimes fixing the electronics means getting deeper than the diagnostic port.
NEXIQ Heavy-Duty Communication Equipment
Mondak uses NEXIQ heavy-duty communication interfaces with our diagnostic software.
These interfaces allow our service computers and OEM software to communicate with applicable:
- Engine controllers
- Transmission controllers
- ABS systems
- Chassis modules
- Aftertreatment systems
- Body controllers
- PTO systems
- Vocational equipment controls
NEXIQ also gives us flexibility when working beyond normal highway-truck applications into heavy and off-highway equipment.
Mack & Volvo Diagnostics
For applicable Mack and Volvo platforms, Mondak uses Premium Tech Tool.
That gives us manufacturer-specific diagnostic access for systems involving:
- Engines
- Aftertreatment
- Electrical systems
- Transmission controls
- Vehicle networks
- Parameters and calibrations
- Applicable programming functions
A generic scanner may show the code.
OEM software can often show us considerably more about what the truck is actually doing.
Freightliner, Western Star & Detroit
Mondak uses Detroit DiagnosticLink for applicable Detroit and Daimler Truck systems commonly found in:
- Freightliner
- Western Star
- Detroit-powered vocational equipment
That gives us manufacturer-specific access when troubleshooting engine, electrical, aftertreatment and communication problems.
Peterbilt, Kenworth & PACCAR
For applicable PACCAR systems, Mondak has DAVIE4 diagnostic capability.
That is especially useful on:
- Peterbilt
- Kenworth
- PACCAR MX-powered equipment
When a truck has an engine, aftertreatment or electronic problem, we can work deeper than basic generic fault-code information.
International / Navistar
International trucks can require different diagnostic platforms depending on model, generation and system.
Mondak has tools including:
- Service Diagnostics Solutions
- Navistar Engine Diagnostics
- Diamond Logic Builder
- ServiceMaxx
- NavKal
This becomes especially valuable on vocational trucks where chassis electronics and the equipment mounted on the truck need to work together.
Cummins & Allison
For applicable Cummins engines, Mondak uses Cummins INSITE for diagnostics, electronic testing, parameters and supported programming functions.
For Allison-equipped trucks and equipment, we use Allison DOC for applicable transmission diagnostics and electronic control work.
That means an engine or transmission complaint does not have to stop at a generic code description.
Bendix & WABCO
Truck electronics extend well beyond the engine and transmission.
Mondak also has diagnostic capability for electronic brake and chassis systems using platforms including:
- Bendix ACom
- WABCO TOOLBOX / TOOLBOX PLUS
That can include problems involving:
- ABS
- Wheel-speed sensors
- Stability-control systems
- Electronic braking controls
- Trailer ABS
- Related chassis electronics
Sometimes a brake warning is mechanical.
Sometimes it is electrical.
Sometimes it is both.
Scania & European Equipment Diagnostics
Mondak's diagnostic capability is not limited to the typical North American truck brands.
We also have Scania SDP3 capability for applicable Scania-powered equipment, along with additional diagnostic tools for specialized and European equipment.
That matters when an imported machine arrives with an electronic system a generic heavy-duty scan tool cannot fully access.
Starting & Charging Problems
Not every electrical problem needs a laptop.
We also troubleshoot the fundamentals:
- Batteries
- Starters
- Alternators
- Battery cables
- Voltage drop
- Grounds
- Fuses and relays
- Wiring harnesses
- Connectors
- Sensors
- Solenoids
- Starting circuits
- Charging circuits
- Parasitic electrical draws
A truck that will not crank does not automatically need a starter.
A truck that repeatedly kills batteries does not automatically need another battery.
Replacing the part at the end of the circuit will not fix a problem upstream.
CAN & J1939 Communication Problems
Modern trucks can have multiple controllers sharing information across the vehicle network:
- Engine
- Transmission
- ABS
- Aftertreatment
- Body controller
- Instrument cluster
- PTO
- Hydraulic equipment
- Aerial equipment
- Crane controls
When network communication breaks down, one problem can produce a long list of unrelated-looking faults.
A controller that disappears from the network is not automatically a failed controller.
We also look at:
- CAN wiring
- Connectors
- Termination
- Power supply
- Grounds
- Harness damage
- Other modules affecting the network
Vocational Trucks Add Another Layer
A service truck, bucket truck, crane truck or hydraulic work truck often has considerably more electronics than the chassis left the factory with.
That can include:
- PTO controls
- Hydraulic pump controls
- Solenoid valves
- Remote controls
- Outriggers and stabilizers
- Aerial controls
- Crane controls
- Service-body wiring
- Auxiliary power
- Safety interlocks
- Added controllers
The truck manufacturer may have built one part of the system.
The equipment manufacturer built another.
Mondak is comfortable troubleshooting where the two meet.
When Electrical Looks Hydraulic
A hydraulic function that will not move is not necessarily a hydraulic failure.
The valve may never be receiving a command.
A proportional solenoid may have the wrong signal.
An interlock may be preventing operation.
A PTO may not engage because the truck does not see the correct transmission, brake or engine condition.
That is where being able to work across electrical, electronic, hydraulic and mechanical systems matters.
Stop Chasing the Same Fault
Whether you have a no-start, CAN fault, intermittent derate, ABS warning, transmission issue, failed ECM, charging problem or vocational-equipment control fault, you do not have to diagnose it before calling us.
If you already have fault codes or know when the problem happens, bring that information with you.
Tell us the truck, engine, equipment mounted on it and what it is doing. We'll start there.