Inspection Instruments

For inspection, use the following instruments:

1. Test light

   A test light consists of a 12 V bulb and lead wires. It is used to check voltages or short circuits.

   Fig 1: Checking ECU-Related Circuits

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Self-powered test light

   A self-powered test light consists of a bulb, battery and lead wires connected in series. It is used to check continuity or grounding.

   Fig 2: Checking Continuity

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   CAUTION: Never use a jumper wire to connect a power supply directly to a load.
3. Jumper wire

   A jumper wire is used to close an open circuit.

   Fig 3: Identifying Jumper Wire

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. Voltmeter

   A voltmeter is used to measure the circuit voltage. Normally, the positive (red lead) probe is applied to the point of voltage measurement and the negative (black lead) probe to the body ground. Use a digital voltmeter to check for voltage drop before or after a component.

   Fig 4: Measuring Circuit Voltage Using Voltmeter

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. Ohmmeter

   An ohmmeter is used to check continuity or measure resistance of a switch or coil. If the measuring range has been changed, the zero point must be adjusted before measurement.

   Fig 5: Identifying Ohmmeter Zero Point

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.