| A. General |
| MHT5A001 |
Research vehicle service information, including vehicle service history, service precautions, and technical service bulletins. |
| MHT5A002 |
Demonstrate knowledge of electrical/electronic series, parallel, and series-parallel circuits using principles of electricity (Ohm’s Law). |
| MHT5A003 |
Demonstrate proper use of test equipment when measuring source voltage, voltage drop (including grounds), current flow, continuity, and resistance. |
| MHT5A004 |
Demonstrate knowledge of the causes and effects of shorts, grounds, opens, and resistance problems in electrical/electronic circuits; identify and locate faults in electrical/electronic circuits. |
| MHT5A005 |
Use wiring diagrams during the diagnosis (troubleshooting) of electrical/electronic circuit problems. |
| MHT5A006 |
Measure parasitic (key-off) battery drain; determine needed action. |
| MHT5A007 |
Demonstrate knowledge of the function, operation, and testing of fusible links, circuit breakers, relays, solenoids, diodes, and fuses; perform inspection and testing; determine needed action. |
| MHT5A008 |
Inspect, test, repair (including solder repair), and/or replace components, connectors, seals, terminal ends, harnesses, and wiring; verify proper routing and securement; determine needed action. |
| MHT5A009 |
Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings. |
| MHT5A010 |
Diagnose faults in the data bus communications network; determine needed action. |
| MHT5A011 |
Identify electrical/electronic system components and configuration. |
| MHT5A012 |
Check frequency, pulse width, and waveforms of electrical/electronic signals using appropriate test equipment; interpret readings; determine needed repairs. |
| MHT5A013 |
Understand the process for software transfer, software updates, and/or reprogramming of electronic modules. |
| B. Battery System |
| MHT5B001 |
Identify battery type and system configuration. |
| MHT5B002 |
Confirm proper battery capacity for application; perform battery state-of-charge test; perform battery capacity test, determine needed action. |
| MHT5B003 |
Inspect battery, battery cables, connectors, battery boxes, mounts, and hold-downs; determine needed action. |
| MHT5B004 |
Charge battery using appropriate method for battery type. |
| MHT5B005 |
Jump-start vehicle using a booster battery and jumper cables or using an appropriate auxiliary power supply. |
| MHT5B006 |
Check low voltage disconnect (LVD) systems; determine needed action. |
| MHT5B007 |
Inspect, clean, and service battery; replace as needed. |
| MHT5B008 |
Inspect and clean battery boxes, mounts, and hold-downs; repair or replace as needed. |
| MHT5B009 |
Test, and clean battery cables and connectors; repair or replace as needed. |
| MHT5B010 |
Identify electrical/electronic modules, radios, and other accessories that require reinitialization or code entry after reconnecting vehicle battery. |
| C. Starting System |
| MHT5C001 |
Demonstrate understanding of starter system operation. |
| MHT5C002 |
Perform starter circuit cranking voltage and voltage drop tests; determine needed action. |
| MHT5C003 |
Inspect and test starter control circuit switches (key switch, push button, and/or magnetic switch), relays, connectors, terminals, wires, and harnesses (including over-crank protection); determine needed action. |
| MHT5C004 |
Diagnose causes of no-crank or slow crank condition; differentiate between electrical and engine mechanical problems; determine needed action. |
| MHT5C005 |
Perform starter current draw tests; determine needed action. |
| MHT5C006 |
Remove and replace starter; inspect flywheel ring gear or flex plate. |
| D. Charging System |
| MHT5D001 |
Identify and understand operation of the generator (alternator). |
| MHT5D002 |
Test instrument panel mounted voltmeters and/or indicator lamps; determine needed action. |
| MHT5D003 |
Inspect, adjust, and/or replace generator (alternator) drive belt; check pulleys and tensioners for wear; check fans and mounting brackets; verify proper belt alignment; determine needed action. |
| MHT5D004 |
Inspect cables, wires, and connectors in the charging circuit. |
| MHT5D005 |
Perform charging system voltage and amperage output tests; perform AC ripple test; determine needed action. |
| MHT5D006 |
Perform charging circuit voltage drop tests; determine needed action. |
| MHT5D007 |
Remove, inspect, and/or replace generator (alternator). |
| E. Lighting Systems |
| MHT5E001 |
Diagnose causes of brighter-than-normal, intermittent, dim, or no-light operation; determine needed action. |
| MHT5E002 |
Test, replace, and aim headlights. |
| MHT5E003 |
Inspect cables, wires, and connectors in the lighting systems. |
| MHT5E004 |
Diagnose faults in tractor-to-trailer multi-wire connector(s), cables, and holders; determine needed action. |
| MHT5E005 |
Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of exterior lighting systems; determine needed action. |
| MHT5E006 |
Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of interior lighting systems; determine needed action. |
| MHT5E007 |
Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of auxiliary lighting circuits; determine needed action. |
| F. Instrument Cluster and Driver Information Systems |
| MHT5F001 |
Check gauge and warning indicator operation. |
| MHT5F002 |
Diagnose faults in the sensor/sending units, gauges, switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, printed circuits, and control components/modules of the instrument cluster, driver information systems, and warning systems; determine needed action. |
| MHT5F003 |
Inspect, test, replace, and calibrate (if applicable) electronic speedometer, odometer, and tachometer systems. |
| G. Cab and Chassis Electrical Systems |
| MHT5G001 |
Diagnose operation of horn(s), wiper/washer, and occupant restraint systems. |
| MHT5G002 |
Understand operation of safety systems and related circuits (such as: speed control, collision avoidance, lane departure, and camera systems). |
| MHT5G003 |
Understand operation of comfort and convenience systems and related circuits (such as: power windows, power seats, power locks, remote keyless entry, steering wheel controls, and cruise control). |
| MHT5G004 |
Understand operation of entertainment systems and related circuits (such as: radio, DVD, navigation, speakers, antennas, and voice-activated accessories). |
| MHT5G005 |
Understand the operation of power inverter, protection devices, connectors, terminals, wiring, and control components/modules of auxiliary power systems. |
| MHT5G006 |
Understand operation of telematics systems. |
| MHT5G007 |
Diagnose faults in engine block and engine oil heater(s); determine needed action. |