Front Ho2S Heater Resistance Inspection; Front Ho2S Circuit - Mazda CX-7 2007 Workshop Manual

4. Verify that the front HO2S current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.
• If not within the specification, inspect the HO2S for an open or short circuit. (See01-40-38 Front HO2S
Circuit Open/Short Inspection (Sensor).) Then if there is no malfunction in the wiring harness, replace the
front HO2S.

Front HO2S Heater Resistance Inspection

1. Disconnect the front HO2S connector.
2. Measure the resistance between front HO2S
terminals 2B and 2D.
• If not within the specification, replace the front
HO2S. (See01-40-37 HEATED OXYGEN
SENSOR (HO2S) REMOVAL/
INSTALLATION[L3 WITH TC].)
Front HO2S heater resistance
1— 10 ohms
Front HO2S Circuit Open/Short Inspection (Sensor)
1. Disconnect the PCM connector.
2. Disconnect the front HO2S connector.
3. Inspect the following wiring harnesses for an
open or short circuit. (Continuity inspection)
01-40–38
CONTROL SYSTEM [L3 WITH TC]
VSS
0 KPH
3,000 RPM
2,000 RPM
RPM
1,000 RPM
0 RPM
0.25 mA
O2S11
0 mA
0.25 mA OR MORE
2C 2A
1C 1A
2D 2B
1D 1B
FRONT HO2S
WIRING HARNESS SIDE CONNECTOR
2C 2A
1C 1A
2D 2B
1D 1B
acxuuw00000099
acxuuw00000100
acxuuw00000101