Using electrical measuring equipment
Z-GI-13spec tableUsing electrical measuring equipment
Test lamp
UseTest to find open or shorted circuits.
OperationConnect the test lamp between the circuit being measured and a ground. The lamp will light if the circuit is energized to the point tested.
Handling precautionsTest lamps use 12V 1.4W or 3.4W bulbs or light-emitting diodes (LEDs). Using a large-capacity bulb may damage the CPU.
Jumper wire
UseUsed to create a temporary circuit.
OperationConnect the jumper wire between the terminals of a circuit to bypass a switch.
Handling precautionsDo not connect the jumper wire from the power source line to a ground; this may cause burning or other damage to harnesses or electronic components.
Voltmeter
UseUsed for measuring the voltage of a circuit to locate possible opens or shorts.
OperationConnect the positive (+) probe to the point where voltage is to be measured and the negative (-) probe to a ground.
Handling precautionsConnect the voltmeter in parallel with the circuit. Set the range to the desired voltage. Use the service hole when measuring the voltage at the diagnosis connector. Tie a thin wire to the positive (+) probe to access narrow terminals.
Ohmmeter
UseUsed to find opens and shorts in the circuit, to confirm continuity and to measure resistance.
OperationZero the ohmmeter. Verify that voltage is not applied to the circuit. Connect the probes between two points in a circuit.
Handling precautionsZero the meter after switching to the measuring range. Before using the ohmmeter, make sure the ignition switch is off or the negative (-) battery cable is disconnected to prevent burning or otherwise damaging the ohmmeter.
Ammeter
UseUsed to check alternator output, current supplied to the starter, and dark current within a circuit. Note: Dark current is the constant flow of current while the ignition switch is OFF.
OperationConnect the ammeter in series with the circuit by touching the positive (+) probe to the power-side terminal and the negative (-) probe to the ground-side terminal.
Handling precautionsSet the range to the desired amperage. Connect the ammeter in series with the circuit. The ammeter may be burned or otherwise damaged if it is connected in parallel.