Mazda 6 2002 Workshop Manual page 233

STEP
3 INSPECT POWER CIRCUIT FOR OPEN
CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Measure voltage following terminal and body
ground.
— EGR valve terminal C
— EGR valve terminal D
• Is voltage B+?
4 INSPECT EGR VALVE
• Perform EGR valve inspection.
(See F–40 EGR VALVE
• Is EGR valve okay?
5 INSPECT FOR CONTROL CIRCUIT FOR SHORT
TO GROUND
• Turn ignition key to OFF.
• Inspect continuity following terminal and body
ground:
— EGR valve terminal E
— EGR valve terminal A
— EGR valve terminal B
— EGR valve terminal F
• is there continuity?
6 INSPECT FOR CONTROL CIRCUIT FOR SHORT
TO POWER
• Turn ignition switch key to ON (Engine OFF).
• Measure voltage following terminal and body
ground:
— EGR valve terminal E
— EGR valve terminal A
— EGR valve terminal B
— EGR valve terminal F
• Is voltage B+?
7 INSPECT POOR CONNECTION OF PCM
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunctions?
8 INSPECT CONTROL CIRCUIT FOR OPEN
CIRCUIT
• Remove PCM with PCM connector connected.
• Inspect continuity following terminals:
— Between EGR valve terminal E and PCM
terminal 4E
— Between EGR valve terminal A and PCM
terminal 4H
— BetweenEGR valve terminal B and PCM
terminal 4K
— Between EGR valve terminal F and PCM
terminal 4N
• Is there continuity?
9 VERIFY TROUBLESHOOTING OF DTC P0403
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOEO/KOER self-test.
(See F–66 KOEO/KOER
• Is same DTC present?
10 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See F–66 AFTER REPAIR
• Is there any DTC present?
End Of Sie
F–136
ON-BOARD DIAGNOSTIC
INSPECTION
INSPECTION.)
SELF-TEST.)
PROCEDURE.)
Yes Go to net step.
No Repair or replace harness for open circuit then go to Step
9.
Yes Go to net step.
No Replace EGR valve, then go to Step 9.
Yes Repair or replace harness for short to ground, then go to
Step 9.
No Go to net step.
Yes Repair or replace harness for short to power, then go to
Step 9.
No Go to net step.
Yes Repair or replace terminals and/or connector, then go to
Step 9.
No Go to net step.
Yes Go to net step.
No Repair or replace harness for open circuit then go to net
step.
Yes Replace PCM, then go to net step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to net step.
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE.)
No Troubleshooting completed.
ACTION