Mazda 6 2002 Workshop Manual page 330

STEP INSPECTION
7 Are following item okay?
• CKP sensor and crankshaft pulley
• PCM terminal 1A/1B voltage
Specification
Appro. 1.5 V
EGR Control System Inspection
1. Verify that EGR valve operation (initial operation) sound is heard when the ignition switch is turned to ON
position.
• If the operation sound is not heard, connect WDS or equivalent to the DLC-2 and verify that the DTC P0403
is shown. Carry out DTC inspection. (See
2. Start the engine and run it at idle.
3. Increase the step value of EGR valve from 0 to 40 using SEGRP PID.
4. Operate the EGR valve and inspect if the engine speed becomes unstable or the engine stalls.
• If the engine speed will not change, proceed to following.
(1) Stop the engine.
(2) Remove the EGR valve.
(3) Connect the EGR valve connector.
(4) Turn the ignition switch to ON.
(5) Increase the step value of EGR valve from 0 to 40 using SEGRP PID.
(6) Inspect the EGR operation.
• If the EGR valve is operated, clean the EGR valve and reinspect from Step 2.
• If the EGR valve will not operate, replace the EGR valve and reinspect from Step 2.
5. Warm up the engine to normal operating temperature.
6. Select the following PIDs.
• ECT
• RPM
• SEGRP
• TP
• VSS
7. Let the vehicle idle and verify that the SEGRP value is 0.
8. Put the vehicle in drive.
9. Depress the accelerator pedal and verify that the SEGRP value is increased.
• If the SEGRP value will not increase, inspect the VSS, TP and ECT PIDs. (See
10. Stop the vehicle and verify that the SEGRP value is returned 0.
Purge Control System Inspection
1. Start the engine.
2. Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
3. Put a finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold.
• If there is a vacuum, inspect the following.
— Wiring harness and connectors (Purge solenoid valve-PCM terminal 4U)
— Purge solenoid valve
4. Warm up the engine to the normal operating temperature.
5. Stop the engine.
6. Connect WDS or equivalent to the DLC-2 and verify that the DTC P0443 is shown. Carry out DTC inspection.
(See F–67 DTC TABLE.)
7. Turn the ignition switch to ON position.
8. Select ECT PID.
9. Verify that the engine coolant temperature is above 60° ° ° ° C {140° ° ° ° F}.
• If WDS or equivalent indicates below 60° ° ° ° C {140° ° ° ° F}, carry out the ECT sensor inspection.
10. Select EVAPCP PID.
11. Increase the duty value of the purge solenoid valve to 50% and inspect if the operation sound of the valve is
heard.
• If the operation sound is heard, inspect for the loose or damaged vacuum hose. (Intake manifold-purge
solenoid valve-charcoal canister)
• If the operation sound is not heard, carry out the purge solenoid valve inspection.
TROUBLESHOOTING
RESULTS
Yes Inspect for open or short in wiring harness and
connector of CKP sensor.
No Repair or replace malfunctioning parts, then go to Step
1.
F–67 DTC TABLE.)
ACTION
F–45 PCM INSPECTION.)
F–233
F