FI SYSTEM DIAGNOSIS 4-73
4) Check for proper terminal connection to the ECM couplers.
5) If connections are OK, check the following points.
• Resistance
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
Tester knob indication: Resistance (
)
– Between W, B and B/Br wires of HO2 sensor coupler and
ECM coupler: less than 1
– Between each of W, B and B/Br wires and ground: infinity
– Between W wire terminal and other terminal at HO2 sensor
coupler: infinity
– Between B wire terminal and other terminal at HO2 sensor
coupler: infinity
– Between B/Br wire terminal and other terminal at HO2 sen-
sor coupler: infinity
2
2
2
2
2
