Variable Swirl System Operation Inspection - Mazda CX-7 2007 Workshop Manual

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
Throttle position (TP) sweep inspection
1. Connect the M-MDS to the DLC-2.
2. Reform the KOER self-test function.
(See01-02-10 KOEO/KOER SELF TEST[L3 WITH TC].)
3. Verify that none of the following DTCs are displayed:
• P0122, P0123, P0222, P0223, P2100, P2101, P2102, P2103, P2107, P2108, P2119, P2122, P2123,
P2127, P2128, P2135, P2138
— If any one DTC is displayed, perform the DTC inspection.
4. Access the TP_REL PID.
5. Verify that the PID reading is within the CTP value. (See01-40-6 PCM INSPECTION[L3 WITH TC].)
• If the PID reading is out of range, perform the following:
— Remove the air duct from the throttle valve body.
— Verify that the throttle valve opens when the accelerator pedal is depressed.
• If the throttle valve opens, inspect the throttle position sensor and the related wiring harness.
• If the throttle valve does not open, inspect the throttle actuator control motor and the related wiring
harness.
6. Gradually depress the throttle pedal and verify that the PID reading increases lineally.
• If the PID reading drops momentarily, inspect the following:
— Throttle position sensor
7. Fully depress the throttle pedal and verify that the PID reading is within the WOT value. (See01-40-6 PCM
INSPECTION[L3 WITH TC].)
• If the PID reading is out of range, perform the following:
— Remove the air duct from throttle valve body with connector connected.
— Verify that the throttle valve opens when throttle pedal is depressed.
• If the throttle valve opens, inspect the throttle position sensor and the related wiring harness.
• If the throttle valve does not open, inspect the throttle actuator control motor and the related wiring
harness.

Variable Swirl System Operation Inspection

1. Connect the M-MDS to the DLC-2.
2. Access the ECT PID.
3. Verify that the ECT PID is below 60°C {140°F}.
4. Start the engine.
5. Inspect the rod operation under the following conditions:
Rod operation
Engine speed
Shutter valve actuator
If the rod operation is not specified, inspect as follows:
1. Perform the KOER self-test using the M-MDS and verify that DTCs No. P2004, P2006, P2009 or P2010 are not
displayed.
• If DTC No. P2004, P2006, P2009 or P2010 are displayed, perform DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
If simulation function of M-MDS is used:
1. Turn the ignition switch to the ON position. (Engine off)
2. Turn the variable swirl solenoid valve from off to on using the IMRC PID and verify that the operation sound of
the solenoid valve is heard.
• If the operation sound is not heard, replace the variable swirl solenoid valve.
(See01-13-13 VARIABLE SWIRL SOLENOID VALVE INSPECTION[L3 WITH TC].)
• If the operation sound is not heard, inspect the following:
— Vacuum hose and vacuum chamber for looseness or damage
— Shutter valve actuator
(See01-13-13 VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION[L3 WITH TC].)
— Check valve is stuck open or closed
— Shutter valve cannot move smoothly
If simulation function of M-MDS is not used:
1. Inspect variable swirl solenoid valve.
(See01-13-13 VARIABLE SWIRL SOLENOID VALVE INSPECTION[L3 WITH TC].)
• If the variable swirl solenoid valve is not normal, replace the variable swirl solenoid valve.
• If the variable swirl solenoid valve is normal, inspect the following:
— Vacuum hose and vacuum chamber for looseness or damage
— Shutter valve actuator
(See01-13-13 VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION[L3 WITH TC].)
— Check valve is stuck open or closed
— Shutter valve cannot move smoothly
3,750 rpm
Below Above
Operate Not operate
01-03
01-03–83