Symptom Troubleshooting (Engine): Overview Mazda CX-7 I facelift

Scheme 1

Scheme 2

Scheme 3

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/cx-7/i-facelift-2009-2012/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system) ). 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-343773-S37676995202009101500000).)

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-343785-S40908835692009101500000) ). Wiring harness and connector between ignition switch and main relay terminal A. Wiring harness and connector between PCM terminal 1 AT and main relay terminal B.

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

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. (See «DTC TABLE [L3 WITH TC]»(/mazda/cx-7/i-facelift-2009-2012/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system) ).

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. (See «VARIABLE SWIRL SOLENOID VALVE INSPECTION [L3 WITH TC]»(ref-343780-S25632288892009101500000) ). 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-343780-S26466557622009101500000) ). 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. (See «VARIABLE SWIRL SOLENOID VALVE INSPECTION [L3 WITH TC]»(ref-343780-S25632288892009101500000) ). 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-343780-S26466557622009101500000) ). Check valve is stuck open or closed Shutter valve cannot move smoothly

Fuel Injector Operation Inspection

If simulation function of M-MDS is used

If simulation function of M-MDS is not used

Fuel Pump Operation Inspection

If simulation function of M-MDS is used

1. Connect the M-MDS 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 1H 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 M-MDS 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, 1H 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 M-MDS is used

1. Start the engine and run it at 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 2AA) Wastegate control solenoid valve (Stuck open)
4. Warm up the engine to normal operating temperature.
5. Connect the M-MDS to the DLC-2 and verify that DTC P0245 or P0246 are shown. Perform the DTC inspection. (See «DTC P0245 [L3 WITH TC]»(/mazda/cx-7/i-facelift-2009-2012/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system) ). (See «DTC P0246 [L3 WITH TC]»(/mazda/cx-7/i-facelift-2009-2012/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system) ).
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-343780-S15742848532009101500000) ).
8. Warm up the engine to normal operating temperature.
9. Monitor the VGT and APP PIDs using the M-MDS.
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 M-MDS is not used

1. Start the engine and run it at 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 2AA) Wastegate control solenoid valve (Stuck open)
4. Warm up the engine to normal operating temperature.
5. Connect the M-MDS 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/cx-7/i-facelift-2009-2012/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system) ). (See «DTC P0246 [L3 WITH TC]»(/mazda/cx-7/i-facelift-2009-2012/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system) ).
6. Warm up the engine to normal operating temperature.
7. Monitor the VGT and APP PIDs using the M-MDS.
8. The hose between the wastegate control solenoid valve and intake pipe is disconnected.
9. 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))

See also:
• DTC TABLE [L3 WITH TC]