Rear Ho2S Circuit - Mazda CX-7 2007 Workshop Manual

4. Verify that the rear HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the rear HO2S
voltage (PID: O2S12) is 0.3 V or less while decelerating as shown in the figure.
• If not within the specification, inspect the HO2S for an open or short circuit. (See01-40-40 Rear HO2S
Circuit Open/Short Inspection (Sensor).) Then if there is no malfunction in the wiring harness, replace the
rear HO2S.
Rear HO2S Circuit Open/Short Inspection (Sensor)
2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z 2V 2R 2N
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
01-40–40
CONTROL SYSTEM [L3 WITH TC]
VSS
0 KPH
3,000 RPM
2,000 RPM
RPM
1,000 RPM
0 RPM
1V
O2S12
0.5V
0V
WIRING HARNESS-SIDE CONNECTOR
2I 2E 2A
2J 2F 2B
2K 2G 2C
2H 2D
2L
0.3V OR LESS
WIRING HARNESS SIDE CONNECTOR
PCM
1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M
1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z 1V 1R 1N
1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O
1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X
acxuuw00000104
REAR HO2S
A C
B
D
acxuuw00000105
1I 1E 1A
1J 1F 1B
1K 1G 1C
1T 1P 1L 1H 1D
acxuuw00000103