Mazda 2002 6 Workshop Manual page 361

Variable Tumble Control System (VTCS) Operation Inspection
1. Connect the WDS or equivalent to the DLC-2.
2. Access ECT PID.
3. Verify that ECT PID is between 63°C {145°F} and 67°C {152°F}.
4. Start the engine.
5. Inspect rod operation under the following condition.
Rod operation
Engine speed
Shutter valve actuator
• If the rod operation is not specified, inspect as follows.
(1) Verify that DTC No. P2009 or P2010 is not displayed.
• If DTC No. P2009 or P2010 are shown, carry out DTC inspection.
(See F–67 DTC
(2) Turn ignition switch to ON.
(3) Turn the VTCS solenoid valve from on to off using the IMRC PID and verify that operation sound of the
solenoid valve is heard.
• If the operation sound is heard, inspect the following.
— Vacuum hose and vacuum chamber for looseness or damage
— Shutter valve actuator
(See F–15 VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SHUTTER VALVE ACTUATOR
INSPECTION.)
— Shutter valve stuck open or close
• If the operation sound is not heard, inspect the following.
— VIS control solenoid valve
(See F–15 VARIABLE TUMBLE CONTROL SOLENOID VALVE
Fuel Injector Operation Inspection
STEP INSPECTION
1 While cranking engine, inspect for fuel injector
operation sound at each cylinder using a
soundscope.
Is operation sound heard?
2 Carry out main relay operation inspection.
Is main relay operation normal?
3 Change fuel injector connector of not operating
fuel injector and operating fuel injector.
Is operation sound heard?
4 Are wiring harness and connectors of not
operation fuel injector okay? (Open or short)
Fuel Cut Control System Inspection
1. Warm up engine and let it idle.
2. Turn off the electrical loads and A/C switch.
3. Connect WDS or equivalent to the DLC-2.
4. Select RPM and FUELPW1 PIDs.
5. Monitor both PIDs while performing the following steps.
(1) Depress the accelerator pedal and increase the engine speed to 4,000 rpm.
(2) Release the accelerator pedal (brake pedal is not depressed) and verify that the fuel injector duration time
is 0 msec., and 2—5 msec. when the engine speed drops below 1,200 rpm.
• If not as specified, inspect the following.
— ECT sensor and related harness
(See F–53 ENGINE COOLANT TEMPERATURE (ECT) SENSOR
— Neutral/clutch switch and related harness (MTX)
(See F–59 CLUTCH SWITCH
— TR switch and related harness (ATX)
(See K–14 TRANSAXLE RANGE (TR) SWITCH
TROUBLESHOOTING
3,750 rpm
Below Above
Operate Not operate
TABLE.)
INSPECTION.)
RESULTS
Yes Fuel injector operation is okay.
No All cylinders no heard:
Go to next step.
Some cylinders no heard:
Go to Step 3.
Yes Inspect following:
• Fuel injector power system related wiring harness
and connectors
• PCM connectors
• Fuel injector GND and related wiring harness and
connectors
No Repair or replace malfunctioning parts.
Yes Go to next step.
No Replace fuel injector.
Yes Inspect PCM terminal voltage of fuel injector signal.
No Repair or replace malfunctioning parts.
INSPECTION.)
INSPECTION.)
ACTION
INSPECTION.)
F–231
F