Egr Valve Inspection - Mazda 6 2002 Workshop Manual

EGR VALVE INSPECTION

Operation Test
1. Carry out the “EGR Control Inspection”. (See
• 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”.
Terminals
C—E
C—A
D—B
D—F
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
F–40
EMISSION SYSTEM
F–233 EGR Control System
Resistance (ohms)
12—16
F–43 PCM REMOVAL/INSTALLATION.)
Inspection.
A6E391620300W02
A6E3916W009
A6E3916W011
A6E3916W010