| Test light |
Use to facilitate search for open or short circuits |
- Install test light between terminal and ground in circuit to be measured
- If the circuit is normal, the light will be on
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- When making test lights, use only 12 V bulb (1.4 W or 3.4 W) or light emitting diodes (LEDs)
- If a bulb with a capacity higher than the specified capacity is used, it will burn out transistors, particularly in a control module.
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 Courtesy of MAZDA MOTORS CORP.
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 Courtesy of MAZDA MOTORS CORP.
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| Jumper wire |
Use to operate switches and relays in circuits optionally |
- Install jumper wire between terminals of switches and relays to be operated optionally
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- Do not connect directly between power supply line and ground If it is connected directly, it may burn out wiring harnesses or damage electrical parts
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 Courtesy of MAZDA MOTORS CORP.
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 Courtesy of MAZDA MOTORS CORP.
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| Voltmeter |
Use when checking for open or short circuits by voltage, or electrical signals by voltage |
- Set positive lead wire to voltage measurement location, negative lead wire to ground
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- Connect voltmeter in parallel to circuit
- Use range appropriate to voltage to be measured
- When setting positive lead wire to narrow terminal, wrap thin wire around lead wire to set
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 Courtesy of MAZDA MOTORS CORP.
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 Courtesy of MAZDA MOTORS CORP.
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| Ohmmeter |
Use for verifying open or short circuits using continuity condition continuity of switches, or sensor resistance
NOTE:
- Ohmmeter indicates continuity condition by replacing current flow with resistance when constant voltage is applied to measurement part.
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- Always perform zero reset after changing measuring range
- To prevent the ohmmeter from burning out, make sure that the ignition is switched OFF and the negative battery terminal is disconnected before use.
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 Courtesy of MAZDA MOTORS CORP.
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 Courtesy of MAZDA MOTORS CORP.
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- Verify that power supply is not connected to circuit
- Set lead wire to inspection location
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 Courtesy of MAZDA MOTORS CORP.
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| Oscilloscope |
Used for verifying control module input/output signal (wave pattern) condition |
- Follow directions in the appropriate service information
for measuring range and terminal
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- Follow oscilloscope instruction manual and measure
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 Courtesy of MAZDA MOTORS CORP.
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| Ammeter |
Used to inspect the back-up current in the circuit Back-up current: The current that flows in the circuit even when the ignition is switched OFF. |
- Connect positive lead wire to terminal on power supply side, negative lead wire to terminal on ground side in series with circuit
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- Use range appropriate to current being measured
- Connect ammeter in series with circuit If ammeter is connected in parallel, it may burn out
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 Courtesy of MAZDA MOTORS CORP.
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 Courtesy of MAZDA MOTORS CORP.
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