Symptom Troubleshooting [Engine Control System (L3 with Tc)]: Overview Mazda 6 GG facelift

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1. When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and diagnostic trouble code (DTC), then diagnose the malfunction according to the following flowchart: If a DTC exists, diagnose the applicable DTC inspection. (See «DTC TABLE [L3 WITH TC]»(/mazda/6/gg-facelift-2005-2008/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-l3-with-tc) ). If no DTC exists and the MIL does not illuminate or flash, diagnose the applicable symptom troubleshooting. (See «QUICK DIAGNOSTIC CHART [L3 WITH TC]»(ref-244574-S37192843022006092500000) ).

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition switch is turned to ON position and then off. If there is no operation sound, inspect the following: Main relay (See «RELAY INSPECTION»(ref-244566-S35699014072006092500000) ). Wiring harness and connector between ignition switch and main relay terminal A. Wiring harness and connector between PCM terminal 2X and main relay terminal E.

Variable Swirl System Operation Inspection

1. Connect the WDS or equivalent 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

ROD OPERATION

If the rod operation is not specified, inspect as follows

1. Perform the KOER self-test using the WDS or equivalent 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. (See «DTC TABLE [L3 WITH TC]»(/mazda/6/gg-facelift-2005-2008/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-l3-with-tc) ).

If simulation function of WDS or equivalent 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. (See «VARIABLE SWIRL SOLENOID VALVE INSPECTION [L3 WITH TC]»(ref-244582-S10902355562006092500000) ). If the operation sound is not heard, inspect the following: Vacuum hose and vacuum chamber for looseness or damage Shutter valve actuator (See «VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION [L3 WITH TC]»(ref-244582-S14706490312006092500000) ). Check valve is stuck open or closed Shutter valve cannot move smoothly

If simulation function of WDS or equivalent is not used

1. Inspect variable swirl solenoid valve. (See «VARIABLE SWIRL SOLENOID VALVE INSPECTION [L3 WITH TC]»(ref-244582-S10902355562006092500000) ). 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 (See «VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION [L3 WITH TC]»(ref-244582-S14706490312006092500000) ). Check valve is stuck open or closed Shutter valve cannot move smoothly

Fuel Injector Operation Inspection

If simulation function of WDS or equivalent is used

FUEL INJECTOR OPERATION INSPECTION

If simulation function of WDS or equivalent is not used

FUEL INJECTOR OPERATION INSPECTION

Fuel Pump Operation Inspection

If simulation function of WDS or equivalent is not used

1. Connect the WDS or equivalent to the DLC-2.
2. Remove the fuel-filler cap.
3. Turn the ignition switch to the ON position.
4. Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound of the fuel pump is heard. If no operation sound is heard, proceed to the next step.
5. Measure the voltage at the wiring harness side fuel pump connector terminal B with the FIP PID turned on. If the voltage is as specified, inspect the following: Fuel pump continuity Fuel pump ground Wiring harness between the fuel pump relay and PCM terminal 4Q If not as specified, inspect the following: Fuel pump relay Fuel pump speed control relay Wiring harness connector (Main relay-fuel pump relay-fuel pump resister-fuel pump). Specification 8.0-11.5 V (Ignition switch at ON)

If simulation function of WDS or equivalent is not used

1. Short the check connector terminal F/P to body ground using a jumper wire.
2. Remove the fuel-filler cap.
3. Turn the ignition switch to the ON position.
4. Verify that the fuel pump operation sound is heard. If no operation sound is heard, proceed to the next step.
5. Measure the voltage at wiring harness side fuel pump connector terminal B. If the voltage is as specified, inspect the following: Fuel pump continuity Fuel pump ground Wiring harness between the fuel pump relay and PCM terminal, 4Q If not as specified, inspect the following: Fuel pump relay Fuel pump speed control relay Wiring harness connector (Main relay - fuel pump relay - fuel pump resister - fuel pump). Specification 8.0-11.5 V (Ignition switch at on)

Wastegate Control System Operation Inspection

If simulation function of WDS or equivalent is used

1. Start the engine and run it is idling.
2. Disconnect the hose between the wastegate control solenoid valve and the intake pipe.
3. Put a finger to the wastegate control solenoid valve and verify that there is no pressure applied. If there is pressure, inspect the following: Wiring harness and connectors (Wastegate control solenoid valve-PCM terminal 4H) Wastegate control solenoid valve (Stuck open)
4. Warm up the engine to normal operating temperature.
5. Connect the WDS or equivalent to the DLC-2 and verify that DTC P0245 or P0246 are shown. Perform the DTC inspection. (See «DTC P0245 [L3 WITH TC]»(/mazda/6/gg-facelift-2005-2008/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-l3-with-tc) ). (See «DTC P0246 [L3 WITH TC]»(/mazda/6/gg-facelift-2005-2008/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-l3-with-tc) ).
6. Select the VGT PID.
7. Increase the duty value of the wastegate control solenoid valve and inspect if the operation sound of the solenoid valve is heard. If the operation sound is heard, inspect for loose or damaged vacuum hoses. (Wastegate actuator - wastegate control solenoid valve - intake hose) If the operation sound is not heard, perform the wastegate control solenoid valve inspection. (See «WASTEGATE CONTROL SOLENOID VALVE INSPECTION [L3 WITH TC]»(ref-244582-S11370871932006092500000) ).
8. Warm up the engine to normal operating temperature.
9. Monitor the VGT and APP PIDs using the WDS or equivalent.
10. Run the engine with the APP PID above 30% and verify that the VGT PID value increases from 0%. If the VGT PID is 0% , inspect the APP PID. If simulation function of WDS or equivalent is not used
11. Start the engine and run it is idling.
12. Disconnect the hose between the wastegate control solenoid valve and the intake pipe.
13. Put a finger to the wastegate control solenoid valve and verify that there is no pressure applied. If there is pressure, inspect the following: Wiring harness and connectors (Wastegate control solenoid valve - PCM terminal 4H) Wastegate control solenoid valve (Stuck open)
14. Warm up the engine to normal operating temperature.
15. Connect the WDS or equivalent to the DLC-2 and verify that the DTC P0245 or P0246 are shown. Perform the DTC inspection. (See «DTC P0245 [L3 WITH TC]»(/mazda/6/gg-facelift-2005-2008/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-l3-with-tc) ). (See «DTC P0246 [L3 WITH TC]»(/mazda/6/gg-facelift-2005-2008/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-l3-with-tc) ).
16. Warm up the engine to normal operating temperature.
17. Monitor the VGT and APP PIDs using the WDS or equivalent.
18. The hose between the wastegate control solenoid valve and intake pipe is disconnected.
19. Run the engine with the APP PID above 30% and verify that the VGT PID value increases from 0% and there is pressure applied. If the VGT PID is 0% , inspect the TP_REL PID. If there is no pressure applied, inspect for the following: Wastegate control solenoid valve (Stuck closed) Hose connection (Intake hose (turbocharger compressor downstream side) - wastegate actuator - intake hose (turbocharger compressor upstream side))

Variable Valve Timing Control System Operation Inspection

When idling cannot be continued

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

When idling can be continued

If simulation function of WDS or equivalent is used

1. Warm up the engine to normal operating temperature.
2. Connect the WDS or equivalent to the DLC-2.
3. Start the engine and run it is idling.
4. Select the VT DUTY1 PID.
5. Increase the oil control valve (OCV) duty value and verify that the engine idles roughly or stalls. If as specified, inspect the timing belt component (valve timing deviation). If not as specified, go to the next step.
6. Remove the oil control valve (OCV) while the connector is connected.
7. Turn the ignition switch to the ON position.
8. Select VT DUTY1 PID.
9. Increase the oil control valve (OCV) duty value and verify that the spool valve operates in the advance direction. If as specified, inspect the following hydraulic passage for clogging and/or leakage. Oil pressure switch - oil control valve (OCV) Oil control valve (OCV) - camshaft Camshaft internal passage If not as specified, inspect the following: Oil control valve (OCV) operation Harness and connectors for open or short circuit (Oil control valve (OCV) - PCM terminal 4S)
10. If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator). If simulation function of WDS or equivalent is not used
11. Disconnect the oil control valve (OCV) connector.
12. Warm up the engine and idle it.
13. Apply battery voltage to the oil control valve (OCV) and verify that the engine idles roughly or stalls. If the engine idles roughly or stalls, inspect the timing belt component (valve timing deviation). If the engine does not idle roughly or stalls, go to the next step.
14. Remove the oil control valve (OCV) and perform the spool valve operation inspection. (See «OIL CONTROL VALVE (OCV) INSPECTION [L3 WITH TG]»(ref-244576-S18076375452006092500000) ). If not as specified, inspect the following: Oil control valve (OCV) Harnesses and connectors between oil control valve (OCV) and PCM have an open or short circuit. If as specified, inspect the following hydraulic passages for clogging or leakage or both: Oil pressure switch - oil control valve (OCV) Oil control valve (OCV) - camshaft Camshaft internal passage
15. If they are normal, replace the camshaft pulley (with built-in variable valve timing actuator).

See also:
• DTC TABLE [L3 WITH TC]