Mazda 2002 6 Workshop Manual page 368

3. Inspect the operation sound is heard from cooling fan relay No.1 and cooling fan relay No.4.
— If the operation sound is not heard from cooling fan relay No.4, inspect cooling fan relay No.4 and
open circuit between PCM 4F and cooling fan relay No.4 wiring harnesses and connectors.
— If the operation sound is not heard from cooling fan relay No.1, inspect cooling fan relay No.1 and
between PCM terminal 4F and cooling fan relay No.1 wiring harnesses and connector.
— If the operation sound is heard from cooling fan relay No.1 and cooling fan relay No.4, inspect
wiring harnesses and connectors.
• If the cooling fan motor No.2 does not operate, perform the following:
— Inspect cooling fan motor No.2 and related wiring harnesses and connectors
• If the cooling fan motor No.2 does not operate, perform the following:
1. Select FAN2 PID.
2. Operate cooling fan relay No.3 by sending ON command.
3. Inspect the operation sound is heard from cooling fan relay No.3.
— If the operation sound is heard, inspect wiring harnesses and connectors.
— If the operation sound is not heard, inspect cooling fan relay No.3 and open circuit wiring harnesses
and connectors between PCM terminal 4B and cooling fan relay No.3.
Variable Air Duct (VAD) Control System Operation Inspection (L3 Engine Models)
1. Connect WDS or equivalent to DLC-2.
2. Access ECT, TP and RPM PIDs.
3. Start the engine.
4. Verify ECT PID is 70°C {158°F} or over.
5. Inspect shutter valve operation following condition.
VAD shutter valve operation
5,800 rpm with TP PID 50% or over
Engine speed
Shutter valve
• If the shutter valve operation is not specified, inspect as follows.
(1) Verify that DTC P1410 is not displayed.
• If DTC P1410 is shown, carry out DTC inspection.
(See F–67 DTC
(2) Turn ignition switch to ON.
(3) Turn the VAD control solenoid valve from on to off using the VAD PID and verify that operation sound of the
solenoid valve is heard.
• If the operation sound is heard, inspect the following.
— Vacuum hose looseness or damage
— Vacuum chamber crack or damage
— Shutter valve actuator.
(See F–12 VARIABLE AIR DUCT (VAD) SHUTTER VALVE INSPECTION
• Shutter valve stuck open or close
— If the operation sound is not heard, inspect following.
— VAD control solenoid valve.
(See F–13 VARIABLE AIR DUCT (VAD) CONTROL SOLENOID VALVE INSPECTION
F–238
TROUBLESHOOTING
Below Above
Close Open
TABLE.)
(L3).)
(L3).)