Mazda 2002 6 Workshop Manual page 279

Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 INSPECT POOR CONNECTION OF IAC VALVE
CONNECTOR
• Turn ignition key to OFF.
• Disconnect IAC valve connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Are there any malfunctions?
3 INSPECT IAC VALVE ELECTRICAL
MALFUNCTION
• Inspect IAC valve.
(See F–13 IDLE AIR CONTROL (IAC) VALVE
INSPECTION.)
• Is IAC valve okay?
4 INSPECT CONTROL CIRCUIT FOR SHORT TO
POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between following terminal
and body ground:
— IAC valve terminal A
— IAC valve terminal B
• Is there voltage B+?
5 INSPECT CONTROL CIRCUIT FOR SHORT TO
GROUND
• Turn ignition key to OFF.
• Inspect continuity between following terminals
and body ground:
— IAC valve terminal A
— IAC valve terminal B
• Is there any continuity?
6 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn ignition key to OFF
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Are there any malfunctions?
7 INSPECT CONTROL CIRCUIT MALFUNCTION
FOR OPEN CIRCUIT
• Inspect continuity following terminals:
— Between IAC valve terminal A and PCM
terminal 4G
— Between IAC valve terminal B and PCM
terminal 4J
• Is there any continuity?
8 VERIFY TROUBLESHOOTING OF DTC P0511
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC using WDS or equivalent.
• Perform KOEO/KOER self-test.
(See F–66 KOEO/KOER
• Is same DTC present?
9 VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
(See F–66 AFTER REPAIR
• Is there any DTC present?
End Of Sie
ON-BOARD DIAGNOSTIC
INSPECTION
SELF-TEST.)
PROCEDURE.)
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Repair or replace terminal, then go to Step 8.
No Go to next step.
Yes Go to next step.
No Replace IAC valve, then go to Step 8.
Yes Repair or replace harness, then go to Step 8.
No Go to next step.
Yes Repair or replace harness, then go to Step 8.
No Go to next step.
Yes Repair terminal, then go to Step 8.
No Go to next step.
Yes Repair or replace harness, then go to next step.
No Go to next step.
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE.)
No Troubleshooting completed.
ACTION
F–149
F