Variable Valve Timing Control System Operation Inspection; When Idling Cannot Be Continued; When Idling Can Be Continued - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
- Fan control module power supply circuit (open or short circuit)
- Fan control module GND circuit (open or short circuit)
- Fan control module control signal circuit (open or short circuit between fan control module
terminal B and PCM terminal 1AP)
- Fan control module
(See COOLING FAN MOTOR COMPONENT
10. Verify that the cooling fan operates at medium speed while the COLP PID is off and high speed while
the COLP PID is on.
• If the cooling fan does not operate medium and/or high speed, inspect for the following:
- A/C refrigerant pressure switch (medium switch)
- Fan control module
(See COOLING FAN MOTOR COMPONENT
11. Turn the A/C switch to the off position.
12. Start the engine and idle it.
13. Verify that the cooling fan operating speed increases relative to the ECT PID increase.
• If the cooling fan speed does not increase inspect the following:
- ECT sensor (characteristic)
- Fan control signal circuit (between fan control module terminal B and PCM terminal 1AP)
• If the all items are normal, replace the cooling fan component.

Variable Valve Timing Control System Operation Inspection

When idling cannot be continued

1. Remove the OCV and verify that the spool valve is at maximum retard position.
2. If the spool valve is stuck in advance direction, replace the OCV.
3. Connect the OCV.
4. Turn the ignition switch to the ON position.
5. Verify that the spool valve is at maximum retard position.
6. If the spool valve is stuck in advance direction, inspect for the following.
• Short circuit in wiring harnesses or connectors between the OCV and the PCM.
7. Inspect the variable valve timing actuator.

When idling can be continued

1. Warn-up the engine.
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