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58 tests
Battery & power
- BeginnerFull procedure
Battery Resting Voltage Test
The baseline check: state of charge measured at the posts after the battery has rested.
slow crank · battery light · will not start
- IntermediateFull procedure
Parasitic Drain Test
Measures the current the vehicle draws with everything switched off, to find what is flattening the battery overnight.
battery flat overnight · battery flat after a few days · battery keeps going flat
- BeginnerIndexed
Battery Conductance Test
Electronic health check estimating cold cranking performance without a heavy discharge.
battery health unknown · warranty claim · slow crank
- BeginnerIndexed
Battery Load Test
Applies a controlled load to prove the battery can deliver current, not just hold voltage.
slow crank · battery goes flat · intermittent no start
- BeginnerIndexed
Battery Terminal Voltage Drop
Isolates resistance between the battery post and its clamp under cranking load.
slow crank · corroded terminals · intermittent starting
- IntermediateIndexed
Cold Performance Check
Compares cranking behaviour cold versus warm to expose marginal capacity.
only fails when cold · morning no start
- IntermediateIndexed
Main Earth Strap Test
Checks the engine-to-body and battery-to-body straps under load.
multiple odd faults · slow crank · flickering lights
Circuit testing
- BeginnerFull procedure
Continuity Test
Confirms whether a path exists between two points — fast for finding breaks, useless for finding resistance.
dead circuit · component not working at all · suspected broken wire
- BeginnerFull procedure
Power and Ground Check
The first structured step at any dead component: does it have supply, and does it have ground?
component completely dead · no operation from switch · fault code circuit open
- BeginnerFull procedure
Resistance Test
Measures the resistance of a disconnected component or wire against a known specification.
component not working · fault code for circuit high or low · coil or solenoid suspected
- IntermediateFull procedure
Voltage Drop Test
Measures the voltage lost across a live circuit section to find resistance a continuity test will never see.
slow crank · dim lights · component works intermittently
- AdvancedIndexed
Circuit Current Mapping
Clamps each branch to see where current is actually going.
unexpected drain · fuse rating exceeded · unbalanced loads
- IntermediateIndexed
Connector Terminal Tension Check
Checks female terminals for spread that causes intermittent connections.
intermittent fault · fault clears when connector disturbed
- BeginnerIndexed
Fuse Voltage Check
Tests a fuse in place by measuring voltage at both blade test points.
circuit dead · component not working
- BeginnerIndexed
Harness Wiggle Test
Provokes intermittent faults while monitoring live data or a meter.
intermittent fault · fault only over bumps · random warning lights
- BeginnerIndexed
Relay Test
Checks coil, contacts, supply and control on a standard automotive relay.
component dead · clicking relay · intermittent operation
- IntermediateIndexed
Short to Ground Test
Locates where a circuit is touching ground and blowing fuses.
fuse keeps blowing · circuit dead after fuse replaced
- IntermediateIndexed
Short to Power Test
Finds an unintended feed reaching a circuit that should be off.
component stays on · lights stay on · unexpected operation
- BeginnerIndexed
Test Lamp Load Check
Applies a real load to expose a phantom voltage the meter shows as healthy.
voltage present but nothing works · component dead
Starting system
- BeginnerFull procedure
Cranking Voltage Test
Watches battery voltage while the engine cranks — the fastest way to separate a weak battery from a starting circuit fault.
slow crank · clicking when starting · engine turns over slowly
- IntermediateFull procedure
Starter Current Draw Test
Uses an amp clamp to measure exactly how much current the starter pulls, separating a failing starter from a failing engine.
slow crank · starter getting hot · battery flattens while cranking
- IntermediateIndexed
Ignition Switch Output Test
Verifies each ignition position delivers voltage on the correct outputs.
no crank · dead dash · intermittent electrics
- BeginnerIndexed
Neutral Safety / Clutch Switch Test
Checks the interlock switch that gates the start request.
no crank in park · cranks only in neutral · intermittent no crank
- IntermediateIndexed
Starter Feed Voltage Drop
Measures the drop across the heavy positive cable while cranking.
slow crank · clicking · hot starter cable
- IntermediateIndexed
Starter Ground Voltage Drop
Measures the drop through the engine ground path while cranking.
slow crank · starter drags · hot earth strap
- BeginnerIndexed
Starter Solenoid Trigger Test
Confirms the start signal actually arrives at the solenoid terminal.
no crank · single click · no response on key
Sensors
- IntermediateIndexed
5 Volt Reference Test
Verifies the ECU reference supply feeding sensor circuits.
no 5 volt reference · multiple sensor codes · engine light with several faults
- AdvancedIndexed
Camshaft Sensor Test
Checks cam signal presence and its relationship to the crank signal.
long crank · no start · timing fault code
- BeginnerIndexed
Coolant Temperature Sensor Test
Compares resistance and signal voltage against temperature.
poor cold start · fan running constantly · temperature fault code
- AdvancedIndexed
Crankshaft Sensor Test
Verifies the crank signal is present and clean while cranking.
no start · cuts out when hot · no rpm signal
- IntermediateIndexed
MAP Sensor Test
Checks manifold pressure signal against actual vacuum.
poor running · rich or lean codes · no power
- IntermediateIndexed
Mass Air Flow Sensor Test
Compares measured airflow against calculated expectation.
lack of power · lean codes · poor economy
- AdvancedIndexed
Oxygen Sensor Test
Checks switching or wideband current against fuel trim behaviour.
emissions fault · fuel trim codes · poor economy
- IntermediateIndexed
Sensor Ground Test
Checks the low-current ECU sensor ground for offset that skews readings.
sensor reads high · multiple sensor codes · drivability fault
- IntermediateIndexed
Throttle Position Sensor Sweep
Sweeps the sensor while watching for dropouts in the signal.
hesitation · flat spot · throttle fault code
- IntermediateIndexed
Wheel Speed Sensor Test
Checks the ABS sensor signal while the wheel is turned.
abs light · traction control light · speedometer fault
Charging system
- AdvancedIndexed
Alternator Diode Ripple Test
Looks for AC ripple caused by failed rectifier diodes.
battery keeps going flat · radio interference · erratic electrics
- IntermediateIndexed
Alternator Output Current Test
Clamps the alternator output cable to confirm it can deliver its rated current.
battery light · battery undercharged · lights dim at idle
- IntermediateIndexed
Charging Circuit Voltage Drop
Checks the alternator-to-battery cable and ground under charging load.
undercharging · battery light · voltage at alternator higher than at battery
- BeginnerIndexed
Charging System Voltage Test
Measures regulated output at the battery with the engine running.
battery light · battery keeps going flat · overcharging
- AdvancedIndexed
Smart Charging Control Check
Verifies the battery sensor and ECU-controlled charging strategy behave correctly.
charging voltage varies · battery light · stop-start not working
Networks
- AdvancedIndexed
CAN Bus Voltage Test
Static and dynamic checks on CAN High and CAN Low.
no communication · multiple modules missing · dash lit up
- AdvancedIndexed
CAN Termination Resistance Test
Measures the 60 Ω network termination to find a missing or extra terminator.
no communication · intermittent network faults
- AdvancedIndexed
LIN Bus Signal Test
Checks single-wire LIN signalling between a master and its slaves.
accessory not responding · module fault code · mirror or seat fault
Body & comfort
- IntermediateIndexed
Central Locking Circuit Test
Checks actuator supply, motor current and door switch inputs.
one door will not lock · locking intermittent · alarm triggering
- BeginnerIndexed
Heated Screen / Seat Test
Checks high-current heating elements and their relays.
heater not working · partial heating · fuse blowing
- BeginnerIndexed
Window Motor Circuit Test
Checks polarity switching, supply and motor current.
window slow · window will not move · window works one way
Actuators
- IntermediateIndexed
Cooling Fan Circuit Test
Checks fan control, supply and current draw across speed stages.
overheating · fan not running · fan always on
- IntermediateIndexed
Electric Motor Current Test
Compares motor current draw against expectation to find drag or wear.
slow window · wiper slow · motor stalls
- IntermediateIndexed
Fuel Pump Current Test
Uses current draw to assess pump condition without dropping the tank.
cutting out · no start · lack of power under load
- IntermediateIndexed
Ignition Coil Circuit Test
Checks coil supply, trigger signal and primary behaviour.
misfire · coil fault code · engine shaking
- IntermediateIndexed
Injector Circuit Test
Checks injector supply, driver control and winding condition.
misfire · injector fault code · cylinder dead
- BeginnerIndexed
Solenoid Actuation Test
Confirms a solenoid receives its command and physically responds.
actuator fault code · no response to command
Lighting
- BeginnerIndexed
Headlight Circuit Test
Traces supply, ground and switching on a dim or dead headlight.
dim headlight · one light out · flickering light
- BeginnerIndexed
Indicator Circuit Test
Diagnoses fast flash, no flash and one-side failures.
fast flashing · indicator not working · hazards work but indicators do not
- IntermediateIndexed
LED Lighting Circuit Test
Handles LED modules where conventional bulb-out logic does not apply.
led flicker · bulb out warning · led partially lit
Advanced diagnostics
- AdvancedIndexed
Load Profile Voltage Test
Records voltage and current together to see how a circuit behaves over time.
intermittent fault · fault under heavy load · unexplained resets
- AdvancedIndexed
Module Power and Ground Audit
Systematically verifies every supply and ground pin on a control module.
module not communicating · random faults · module keeps resetting