Mazda 6. Manual — part 126
F–40
EMISSION SYSTEM
EGR VALVE INSPECTION
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Operation Test
1. Carry out the “EGR Control Inspection”. (See
F–233 EGR Control System Inspection
• If not as specified, perform the further inspection for the EGR valve.
Resistance Inspection
Note
• Perform the following test only when directed.
1. Disconnect the negative battery cable.
2. Inspect resistance of the EGR valve coils.
• If not as specified, replace the EGR valve.
• If as specified, carry out the “Circuit Open/
Short Inspection”.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See
2. Inspect the following wiring harness for open or
short (continuity check).
Open circuit
• If there is no continuity, the circuit is open.
Repair or replace the harness.
— EGR valve terminal E (harness-side) and
PCM terminal 4E
— EGR valve terminal A (harness-side) and
PCM terminal 4H
— EGR valve terminal B (harness-side) and
PCM terminal 4K
— EGR valve terminal F (harness-side) and
PCM terminal 4N
— EGR valve terminal C or D (harness-side)
and main relay terminal C (harness-side)
Short circuit
• If there is continuity, the circuit is shorted. Repair or replace the harness.
— EGR valve terminal E (harness-side) and GND
— EGR valve terminal A (harness-side) and GND
— EGR valve terminal B (harness-side) and GND
— EGR valve terminal F (harness-side) and GND
— EGR valve terminal C or D (harness-side) and power supply
3. Remove the EGR valve, and inspect for any damage or clogging.
• If there is no damage or no clogging, replace the EGR valve.
End Of Sie
Terminals
Resistance (ohms)
C—E
C—A
D—B
D—F
12—16
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EMISSION SYSTEM
F–41
F
PCV VALVE INSPECTION
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1. Disconnect the negative battery cable.
2. Remove the intake maniforld.(see
F–10 INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
3. Remove the PCV valve.
4. Blow through the valve and verify that air flows as
specified.
• If not as specified, replace the PCV valve.
Specification
End Of Sie
THREE-WAY CATALYTIC CONVERTER (TWC) INSPECTION
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Note
• Make sure that no HO2S DTCs have been detected. If detected, this inspection is not applicable for TWC
inspection.
1. Connect the WDS or equivalent and monitor PIDs as following.
• Monitor the right TWC using O2S11 PID for upstream HO2S and O2S12 PID for downstream HO2S.
2. Begin to monitor the appropriate PIDs.
3. Drive the vehicle for 10 min at 65—96 km/h {40—60 mph} to allow the front catalytic converter to reach
operating temperature.
4. Stop the vehicle and leave it in a safe place.
5. Let the engine idle.
6. Record PIDs for 1 min.
7. Select the appropriate PIDs and read the graph.
8. Count the number of times (inversions) that the
upstream HO2S graph line actually crosses the
0.5 V line.
9. Count the number of times (inversions) that the
downstream HO2S graph line actually crosses
the 0.5 V line.
Note
• Do not count the number of peaks. Refer to
the graph.
10. Using the following equation, calculate the value
of ratio.
Equation
RATIO = Upstream HO2S inversion
÷ downstream HO2S inversion
• If the ratio is 5.5 or more or there is no downstream HO2S inversion, the TWC is functioning properly.
• If the ratio is less than 1.125, the TWC is not functioning properly. Replace the TWC.
Condition
Airflow
Air applied from port A to B
Yes
Air applied from port B to A
No
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F–42
EMISSION SYSTEM
Upstream HO2S graph line example
Downstream HO2S graph line example 1
Equation
RATIO = 30 inversions (upstream HO2S
inversions)
÷ 5 inversions (downstream
HO2S inversions) = 6.0 (good WU-TWC)
Downstream HO2S graph line example 2
Downstream HO2S graph line example 3
Equation
RATIO = 30 inversions (upstream HO2S
inversions)
÷ 27 inversions (downstream
HO2S inversions) = 1.1 (bad converter)
End Of Sie
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CONTROL SYSTEM
F–43
F
PCM REMOVAL/INSTALLATION
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Note
• For replace the PCM, Setup the WDS and perform the PCM configuration. (See
.)
1. Disconnect the negative battery cable.
2. For R.H.D, perform the following procedures.
(1) Remove the front side trim (left-side).
(2) Partially peel back the flower covering.
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.
U.K. specs.
.
CONTROL SYSTEM
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1
F–44 Set Nut/bolt Removal Note
F–44 Set Nut/bolt Installation Note
)
2
PCM cover No. 2
3
PCM connector
4
PCM
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