Engine Control System Operation Inspection [Lf]; Main Relay Operation Inspection; Intake Manifold Vacuum Inspection - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
4. If you are inspecting the switch, turn it on manually.
5. Spray water onto the vehicle or run it through a car wash.
• If PID value is unstable or malfunction occurs, repair or replace part.
ENGINE CONTROL SYSTEM OPERATION

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition switch is turned to ON position and off.
• If there is no operation sound, inspect the following.
- Main relay (See
- Wiring harness and connector between ignition switch and main relay terminal A
- Wiring harness and connector between PCM terminal 1AT and main relay terminal B

Intake Manifold Vacuum Inspection

1. Verify air intake hoses are installed properly.
2. Start the engine and run it at idle.
3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake
manifold side.
4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum.
• If not as specified, inspect the following.
Specification
More than 60 kPa {451 mmHg, 18 inHg}
Note
• Air suction can be located by engine speed change when lubricant is sprayed on the area where
suction is occurring.
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INSPECTION [LF]
RELAY INSPECTION.)
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