Mazda 6 2002 - Page 246

ON-BOARD DIAGNOSTIC
F149
F
Diagnostic procedure
End Of Sie
STEP INSPECTION ACTION
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
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?
Yes Repair or replace terminal, then go to Step 8.
No Go to next step.
3 INSPECT IAC VALVE ELECTRICAL
MALFUNCTION
• Inspect IAC valve.
(See F13 IDLE AIR CONTROL (IAC) VALVE
INSPECTION.)
• Is IAC valve okay?
Yes Go to next step.
No Replace IAC valve, then go to Step 8.
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+?
Yes Repair or replace harness, then go to Step 8.
No Go to next step.
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?
Yes Repair or replace harness, then go to Step 8.
No Go to next step.
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?
Yes Repair terminal, then go to Step 8.
No Go to next step.
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?
Yes Repair or replace harness, then go to next step.
No Go to next step.
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 SELF-TEST.)
• Is same DTC present?
Yes Replace PCM, then go to next step.
(See F43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
9 VERIFY AFTER REPAIR PROCEDURE
• Perform After Repair Procedure.
(See F66 AFTER REPAIR PROCEDURE.)
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F67 DTC TABLE.)
No Troubleshooting completed.