Mazda CX 7. Manual — part 146
CONTROL SYSTEM [L3 WITH TC]
01-40–25
01-40
7. Remove the ECT sensor.
8. Install in the reverse order of removal.
Tightening torque
10— 14 N·m {102— 142 kgf·cm, 89— 123
in·lbf}
9. Refill the engine coolant. (See01-12-2 COOLING
SYSTEM SERVICE WARNINGS[L3 WITH TC].)
End Of Sie
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION[L3 WITH TC]
id014039802000
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.)
ECT Sensor Resistance Inspection
1. Drain the engine coolant. (See01-12-2 COOLING SYSTEM SERVICE WARNINGS[L3 WITH TC].)
2. Remove the ECT sensor (located above the starter).
3. Place the ECT sensor in water with a thermometer, and heat the water gradually.
4. Measure the resistance between the ECT sensor terminals A and B using a tester.
• If not as specified, replace the ECT sensor.
• If the ECT sensor is normal, but PID value is out of specification, perform the “Circuit Open/Short
Inspection”.
Specification
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)
ECT SENSOR
acxuuw00000091
Water temperature (
°C {°F})
Resistance (kilohm)
20 {68}
35.48— 39.20
80 {176}
3.65— 4.02
A
B
ECT SENSOR
WIRING HARNESS SIDE CONNECTOR
acxuuw00000092
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
acxuuw00000093
1871-1U-06B(01-40).fm 25 ページ 2006年3月15日 水曜日 午前10時53分
CONTROL SYSTEM [L3 WITH TC]
01-40–26
Open circuit
• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
— ECT sensor terminal A and PCM terminal 2AH
— ECT sensor terminal B and PCM terminal 2AY
Short circuit
• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
— ECT sensor terminal A and power supply
— ECT sensor terminal A and body ground
— ECT sensor terminal B and power supply
End Of Sie
WM: MASS AIR FLOW SENSOR
MASS AIR FLOW (MAF) SENSOR INSPECTION[L3 WITH TC]
id014039800700
Visual Inspection
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.)
1. Visually inspect for the following on the MAF sensor. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)
• Damage
• Cracks
• Bent terminals
• Terminal rust
— If any of the above are found, replace the MAF/IAT sensor.
— If the monitor item status/specification (reference) is not within the specification even though there is no
malfunction, perform the "Circuit Open/Short Inspection".
Voltage Inspection
1. Remove the MAF/IAT sensor without disconnect the MAF/IAT sensor connector.
2. Turn the ignition switch to the ON position.
3. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the voltage at PCM
terminal 1AK (M-MDS PID: MAF) varies.
• If it cannot be verified even though the related harnesses have no malfunction, replace the MAF/IAT sensor.
Circuit Open/Short Inspection
A
B
C
D
E
MAF/IAT SENSOR
WIRING HARNESS SIDE CONNECTOR
acxuuw00000076
FUSE BOX
(MAIN RELAY)
A
E
B
D
FRONT
acxuuw00000538
1871-1U-06B(01-40).fm 26 ページ 2006年3月15日 水曜日 午前10時53分
CONTROL SYSTEM [L3 WITH TC]
01-40–27
01-40
1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Disconnect the MAF/IAT sensor connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)
Open circuit
• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
— MAF/IAT sensor terminal A and main relay terminal E
— MAF/IAT sensor terminal B and PCM terminal 1P
— MAF/IAT sensor terminal C and PCM terminal 1AK
Short circuit
• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
— MAF/IAT sensor terminal A and body ground
— MAF/IAT sensor terminal B and power supply
— MAF/IAT sensor terminal C and power supply
— MAF/IAT sensor terminal C and body ground
End Of Sie
WM: INTAKE AIR TEMPERATURE SENSOR
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION[L3 WITH TC]
id014039802200
Resistance Inspection
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.)
1. Disconnect the MAF/IAT sensor.
2. Measure the resistance between the MAF/IAT
sensor terminals D and E using a tester.
• If not as specified, replace the MAF/IAT
sensor. (See01-13-5 INTAKE AIR SYSTEM
REMOVAL/INSTALLATION[L3 WITH TC].)
• If the MAF/IAT sensor is normal, but the PID
is out of specification, perform the “Circuit
Open/Short Inspection”.
Specification
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
acxuuw00000078
Ambient temperature (
°C {°F})
Resistance (kilohm)
20 {68}
2.21— 2.69
60 {140}
0.493— 0.667
A
B
C
D
E
acxuuw00000096
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CONTROL SYSTEM [L3 WITH TC]
01-40–28
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)
Open circuit
• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
— MAF/IAT sensor terminal D and PCM terminal 1M
— MAF/IAT sensor terminal E and PCM terminal 1AR
Short circuit
• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
— MAF/IAT sensor terminal E and power supply
— MAF/IAT sensor terminal D and power supply
— MAF/IAT sensor terminal D and body ground
End Of Sie
WM: MANIFOLD ABSOLUTE PRESSURE SENSOR
A
B
C
D
E
MAF/IAT SENSOR
WIRING HARNESS SIDE CONNECTOR
acxuuw00000097
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
acxuuw00000098
1871-1U-06B(01-40).fm 28 ページ 2006年3月15日 水曜日 午前10時53分
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