MTST V: ELECTRICAL/ELECTRONIC SYSTEMS

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.