Mazda 6 2002 Workshop Manual page 252

Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 INSPECT VIS CONTROL SOLENOID VALVE
CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect VIS control solenoid valve
connector.
• Inspect for poor connection (damaged/pulled-
out pins, corrosion, etc.).
• Is there malfunction?
3 INSPECT VIS CONTROL SOLENOID VALVE
MALFUNCTION
• Perform VIS control solenoid valve inspection.
(See F–14 VARIABLE INTAKE-AIR SYSTEM
(VIS) CONTROL SOLENOID VALVE
INSPECTION (L3))
• Is VIS solenoid valve okay?
4 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect for poor connection at terminal 4R.
(damaged/pulled-out pins, corrosion, etc.).
• Is there malfunction?
5 INSPECT VIS CONTROL SOLENOID VALVE
CONTROL CIRCUIT SHORT TO POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between VIS control solenoid
valve terminal B (harness-side) and body
ground.
• Is voltage B+?
6 VERIFY TROUBLESHOOTING OF DTC P0662
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOEO/KOER self-test.
(See F–66 KOEO/KOER
• Is same DTC present?
7 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 net step.
No Intermittent concern eists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Repair or replace terminal, then go to Step 6.
No Go to net step.
Yes Go to net step.
No Replace VIS control solenoid valve, then go to Step 6.
Yes Repair terminal, then go to Step 6.
No Go to net step.
Yes Repair or replace harness for open, then go to net step.
No 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
F–155
F