Mazda CX 7. Manual — part 149
CONTROL SYSTEM [L3 WITH TC]
01-40–37
01-40
HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION[L3 WITH TC]
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Warning
• A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they
are cool before removing the exhaust system.
1. Disconnect the negative battery cable.
2. Remove the charge air cooler duct. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH
TC].)
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.
HO2S Removal Note
1. Remove the HO2S using the SST.
End Of Sie
HEATED OXYGEN SENSOR (HO2S) INSPECTION[L3 WITH TC]
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Note
• Before performing the following inspection, make sure to follow the procedure as indicated in the
troubleshooting flowchart. (See 00-00-3 HOW TO USE THIS MANUAL.)
Front HO2S Current 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)
— Front HO2S current (PID: O2S11)
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.
1
Connector
2
Front HO2S
(See01-40-37 HO2S Removal Note.)
3
Rear HO2S
(See01-40-37 HO2S Removal Note.)
2
1
SST
29—49
{3.0—4.9, 22—36}
29—49
{3.0—4.9, 22—36}
3
SST
N·m {kgf·m, ft·lbf}
acxuuw00000259
49 L018 001
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CONTROL SYSTEM [L3 WITH TC]
01-40–38
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)
VSS
RPM
0 KPH
3,000 RPM
2,000 RPM
1,000 RPM
0.25 mA
0.25 mA OR MORE
0 mA
0 RPM
O2S11
acxuuw00000099
1A
1D
1C
1B
2A
2D
2C
2B
acxuuw00000100
1A
1D
1C
1B
2A
2D
2C
2B
FRONT HO2S
WIRING HARNESS SIDE CONNECTOR
acxuuw00000101
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CONTROL SYSTEM [L3 WITH TC]
01-40–39
01-40
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.
FUSE BOX
(MAIN RELAY)
A
E
B
D
FRONT
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2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2E
2A
2I
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
2H
2D
2L
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2G
2C
2K
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z
2V 2R 2N
2F
2B
2J
1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M
1E
1A
1I
1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X
1T
1P
1H
1D
1L
1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O
1G
1C
1K
1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z
1V
1R 1N
1F
1B
1J
PCM
WIRING HARNESS-SIDE CONNECTOR
acxuuw00000103
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CONTROL SYSTEM [L3 WITH TC]
01-40–40
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)
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)
VSS
RPM
0 KPH
3,000 RPM
2,000 RPM
1,000 RPM
1V
0.5V
0.3V OR LESS
0V
0 RPM
O2S12
acxuuw00000104
REAR HO2S
WIRING HARNESS SIDE CONNECTOR
A
B
C
D
acxuuw00000105
2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2E
2A
2I
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
2H
2D
2L
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2G
2C
2K
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z
2V 2R 2N
2F
2B
2J
1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M
1E
1A
1I
1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X
1T
1P
1H
1D
1L
1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O
1G
1C
1K
1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z
1V
1R 1N
1F
1B
1J
PCM
WIRING HARNESS-SIDE CONNECTOR
acxuuw00000103
1871-1U-06B(01-40).fm 40 ページ 2006年3月15日 水曜日 午前10時53分
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