Mazda 6 2002 Workshop Manual page 260

DTC P1410 Variable air duct (VAD) control system circuit malfunction
• VAD solenoid valve malfunction.
• Connector or terminal malfunction.
• Short to ground in wiring between VAD solenoid valve terminal B and PCM terminal 4C
POSSIBLE
• Open circuit in wiring between main relay and VAD solenoid valve terminal A
CAUSE
• Open circuit in wiring between VAD solenoid valve terminal B and PCM terminal 4C
• Short to power in wiring between VAD solenoid valve terminal B and PCM terminal 4C
• PCM malfunction
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 CLASSIFY POWER CIRCUIT OR CONTROL
CIRCUIT MALFUNCTION
• Is the same DTC and P0102, P0103, P0403,
P0661, P0662, P2009 or P2010 present?
3 INSPECT POOR CONNECTION OF VAD
SOLENOID VALVE CONNECTOR
• Disconnect VAD solenoid valve connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Are there any malfunctions?
4 INSPECT VAD SOLENOID VALVE POWER
CIRCUIT FOR OPEN CIRCUIT
• Turn ignition switch to ON (Engine OFF).
• Measure voltage between VAD solenoid valve
connector terminal A and body ground.
• Is voltage B+?
5 INSPECT POOR CONNECTION OF VAD
SOLENOID VALVE CONNECTOR
• Disconnect connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Are there any malfunctions?
6 INSPECT VAD SOLENOID VALVE
• Perform VAD solenoid valve inspection.
(See F–12 VARIABLE AIR DUCT (VAD)
SHUTTER VALVE INSPECTION
• Is clutch switch okay?
ON-BOARD DIAGNOSTIC
INSPECTION
(L3).)
Yes Go to net step.
No Intermittent concern eists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Malfunction at power circuit, then go to net step
No Malfunction at VAD solenoid valve or control circuit, then go
to Step 5
Yes Repair terminals, then go to Step 11.
No Go to net step.
Yes Inspect VAD solenoid valve.
• If there is a malfunction, replace VAD solenoid valve,
then go to Step 11
• If there is no malfunction, go to Step 12
No Repair or replace VAD solenoid valve power circuit for
open, then Go to Step 11.
Yes Repair or replace terminals, then go to Step 11.
No Go to net step.
Yes Go to Step 11.
No Replace VAD solenoid valve, then go to Step 11.
ACTION
F–163
F