(b) Voltage Check In a circuit in which voltage is applied (to the ECU connector terminal), an open circuit can be checked for by conducting a voltage check. (1) As shown in Fig. 4, with each connector still connected, measure the voltage between body ground and terminal 1 of connector (A) at the ECU 5V output terminal, terminal 1 of connector (B), and terminal 1 of connector (C), in that order. If the results are: 5 V: Between Terminal 1 of connector (A) and Body Ground 5 V: Between Terminal 1 of connector (B) and Body Ground 0 V: Between Terminal 1 of connector (C) and Body Ground then it is found out that there is an open circuit in the wire harness between terminal 1 of (B) and termi- nal 1 of (C). Fig. 4 0V 5V Sensor C 1 2 B 1 2 A 1 2 ECU 5V 5V BE4066 2. SHORT CIRCUIT CHECK If the wire harness is ground shorted as in Fig. 5, locate the section by conducting a "continuity check with ground". Fig. 5 C 1 2 SHORT B 1 2 A 1 2 BE4067