Rear Ho2S Voltage Inspection - Mazda CX-7 2007 Workshop Manual

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
Open circuit
• If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring
harness.
— Front HO2S terminal 1A and PCM terminal 2AD
— Front HO2S terminal 1B and PCM terminal 2AC
— Front HO2S terminal 1C and PCM terminal 2Z
— Front HO2S terminal 2A and PCM terminal 2M
— Front HO2S terminal 2B and main relay terminal E
— Front HO2S terminal 2C and PCM terminal 2Y
— Front HO2S terminal 2D and PCM terminal 2C
Short circuit
• If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring
harness.
— Front HO2S terminal 1A and body ground
— Front HO2S terminal 1A and power supply
— Front HO2S terminal 1B and body ground
— Front HO2S terminal 1B and power supply
— Front HO2S terminal 1C and body ground
— Front HO2S terminal 1C and power supply
— Front HO2S terminal 2A and power supply
— Front HO2S terminal 2B and body ground
— Front HO2S terminal 2C and body ground
— Front HO2S terminal 2C and power supply
— Front HO2S terminal 2D and body ground
— Front HO2S terminal 2D and power supply

Rear HO2S Voltage Inspection

1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following:
— Vehicle speed (PID: VSS)
— Engine speed (PID: RPM)
— Rear HO2S voltage (PID: O2S12)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine
speed is 3,000 rpm or more.
CONTROL SYSTEM [L3 WITH TC]
PCM
WIRING HARNESS-SIDE CONNECTOR
2E 2A 1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M
2I
2J 2F 2B 1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z 1V 1R 1N
2K 2G 2C 1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O
2H 2D 1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X
2L
FUSE BOX
(MAIN RELAY)
B
FRONT
E
A
D
1T 1P
01-40
acxuuw00000538
1I 1E 1A
1J 1F 1B
1K 1G 1C
1L 1H 1D
acxuuw00000103
01-40–39