Electrical Circuit Inspection Procedure: Notes
- Check Open Circuit
- Procedures for Open Circuit
- Continuity Check
- Voltage Check
If an open circuit occurs (as seen in [Figure below]), it can be found by performing Step 2 (Continuity Check Method) or Step 3 (Voltage Check Method) as shown below.
- Continuity Check MethodNOTE: When measuring for resistance, lightly shake the wire harness above and below or from side to side.
Specification (Resistance)
1 Ω or less → Normal Circuit 1M Ω or Higher → Open Circuit
- Disconnect connectors (A), (C) and measure resistance between connector (A) and (C) as shown in [Figure below].
In [Figure below] the measured resistance of wire 1 and 2 is higher than 1M Ω and below 1 Ω respectively. Specifically the open circuit is wire 1 (Wire 2 is normal). To find exact break point, check sub wire of wire 1 as described in next step.
- Disconnect connector (B), and measure for resistance between connector (C) and (B1) and between (B2) and (A) as shown in [Figure below]. In this case the measured resistance between connector (C) and (B1) is higher than 1M Ω and the open circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).
- Disconnect connectors (A), (C) and measure resistance between connector (A) and (C) as shown in [Figure below].
- Voltage Check Method
- With each connector still connected, measure the voltage between the chassis ground and terminal 1 of each connectors (A), (B) and (C) as shown in [Figure below].
The measured voltage of each connector is 5V, 5V and 0V respectively. So the open circuit is between connector (C) and (B).
- With each connector still connected, measure the voltage between the chassis ground and terminal 1 of each connectors (A), (B) and (C) as shown in [Figure below].