Mazda CX 7. Manual - part 90

 

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Mazda CX 7. Manual - part 90

 

 

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–57

01-03

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1

Is the engine overheating?

Yes

Go to symptom troubleshooting “NO.17 COOLING 
SYSTEM CONCERNS - OVERHEATING.”

No

Go to the next step.

2

Is the engine runs cold?

Yes

Go to symptom troubleshooting “NO.18 COOLING 
SYSTEM CONCERNS - RUNS COLD.”

No

Go to the next step.

3

Connect the M-MDS to the DLC.
Perform the self-test function using the M-MDS.
Turn the ignition switch to the ON position.
Retrieve any DTCs.
Is a DTC displayed?

Yes

DTC is displayed:
Go to appropriate DTC test.

No

No DTC is displayed:
Go to the next step.

4

Inspect for the following.

• Fuel quality (proper octane, contamination, 

winter/summer blend)

• Charge air cooler condition (restriction or 

damaged)

• Air cleaner element (clogging or restriction)

• Intake-air system leakage

• PCV valve installation

• Vacuum line leakage or blockage

• Fuel leakage at fuel system

• Charcoal canister damaged

• Exhaust system and/or three-way catalytic 

converter restriction

Are all items normal?

Yes

Go to the next step.

No

Service if necessary.
Repeat Step 4.

5

Perform the EGR system operation inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the EGR system operate properly?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

6

Perform the TP sweep inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the electronic throttle control system work 
properly?

Yes

Visually inspect the throttle body (damaged/
scratching.) If normal, go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

7

Perform the Variable Swirl Control System 
Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the variable swirl system work properly?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

8

Perform the Wastegate Control System 
Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the variable swirl system work properly?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

9

Perform the Evaporative Emission (EVAP) 
System Leak Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the variable swirl system work properly?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

10

Remove and shake the PCV valve.
Does the PCV valve rattle?

Yes

Go to the next step.

No

Replace the PCV valve.

11

Perform the spark test.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Is a strong blue spark visible at each cylinder?

Yes

Go to the next step.

No

Inspect or replace the malfunctioning parts, according 
to the inspection results.

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–58

12

Inspect CMP and CKP sensor for the following;

• Installation condition

(See01-40-45 CAMSHAFT POSITION 
(CMP) SENSOR REMOVAL/
INSTALLATION[L3 WITH TC].)
(See01-40-42 CRANKSHAFT POSITION 
(CKP) SENSOR REMOVAL/
INSTALLATION[L3 WITH TC].)

• Damaged trigger wheel and camshaft

• Open or short circuit in the wiring harnesses

Is there any malfunction detected?

Yes

Repair or replace the malfunctioning part according to 
the inspection results.

No

Go to the next step.

13

Connect the M-MDS to the DLC-2.
Access and monitor the following PIDs using the 
data monitor function.

• ECT

• MAF

• IAT

• IAT2

• APP

• TP

• MAP

• VSS

• O2S11

• O2S12

• LONGFT1

• SHTFT1

Do the PIDs indicate the correct values 
according to the engine operating condition?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Go to the next step.

No

Inspect and repair or replace suspected parts and the 
related harnesses.
If the malfunction remains, perform the intermittent 
concern troubleshooting procedure.
(See01-03-76 INTERMITTENT CONCERN 
TROUBLESHOOTING[L3 WITH TC].)

14

Access and monitor the FUEL_PRES PID.
Is the FUEL_PRES PID value within the 
specification?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Go to Step 18.

No

Go to the next step.

15

Is the vehicle accelerate performance normally?

Yes

Go to the next step.

No

Go to Step 17.

16

Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR 
INSPECTION[L3 WITH TC].)
Is the fuel pressure sensor normal?

Yes

Go to Step 18.

No

Replace the delivery pipe.

17

Replace the high pressure fuel pump.
Monitor FUEL_PRES PID.
Is the FUEL_PRES PID value within the 
specified?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)

Yes

Troubleshooting is completed.
Go to Step 22.

No

Go to the next step.

18

Inspect the turbocharger.
(See01-13-17 TURBOCHARGER 
INSPECTION[L3 WITH TC].)
Is there any problem in turbocharger?

Yes

Replace the turbocharger.

No

Go to the next step.

19

Inspect the three-way catalytic converter (TWC).
Is the TWC normal?

Yes

Go to the next step.

No

Replace the TWC.

20

Inspect the fuel injector for each cylinder.
(See01-14-27 FUEL INJECTOR 
INSPECTION[L3 WITH TC].)
Are fuel injectors normal?

Yes

Go to the next step.

No

Replace the suspected fuel injector.
(See01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

21

Measure the compression pressure for each 
cylinder.
(See01-10-9 COMPRESSION INSPECTION[L3 
WITH TC].)
Are compression pressures within the 
specification?

Yes

Replace the injector driver module.
If the problem remains, overhaul the engine.

No

Inspect for the following:

• Damaged valve seat

• Worn valve stem and valve guide

• Worn or stuck piston ring

• Worn piston, piston ring or cylinder

• Improper valve timing

Service if necessary.

STEP

INSPECTION

RESULTS

ACTION

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–59

01-03

End Of Sie

NO.16 HIGH OIL CONSUMPTION/LEAKAGE[L3 WITH TC]

id010339802200

Diagnostic procedure

End Of Sie

22

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the 

repair or diagnosis.

— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later 

calibration is available. Retest.

STEP

INSPECTION

RESULTS

ACTION

16

HIGH OIL CONSUMPTION/LEAKAGE

DESCRIPTION

Oil consumption is excessive.

POSSIBLE CAUSE

• PCV valve malfunction

• Improper dipstick

• Improper engine oil viscosity

• Engine internal parts malfunction

• Seal leakage at the compressor or turbine end of turbocharger (indicated by oil in housing on wheel)

• Oil leakage

STEP

INSPECTION

RESULTS

ACTION

1

Remove and shake the PCV valve.
Does the PCV valve rattle?

Yes

Go to the next step.

No

Replace the PCV valve.

2

Verify the following:

• Proper dipstick

• Proper engine oil viscosity

• Engine oil level

Are all items normal?

Yes

Go to the next step.

No

Service if necessary.
Repeat Step 2.

3

Inspect the oil leakage from outside of the 
engine.
Is there any oil leakage found?

Yes

Repair or replace oil leakage part.

No

Go to the next step.

4

Remove the parts to necessary to inspect 
turbocharger without removing the turbocharger.
Visually inspect for the oil leakage inside 
turbocharger compressor and turbine housing.
Is any engine oil found inside turbocharger 
compressor or turbine housing?

Yes

Excessive amount of oil is found:
Replace the turbocharger.
Small amount of oil is found:
Wipe oil out of vehicle, then go to the next step.

No

Go to the next step.

5

Is any engine oil found around oil pipes attached 
on turbocharger center housing?

Yes

If oil leaks from damaged pipe, replace oil pipe.
Install the removed parts at Step 4.

No

Inspect internal engine parts such as valves, valve 
guides, valve stem seals, cylinder head drain passage, 
and piston rings.
Then install the removed parts at Step 4.

6

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the 

repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later 

calibration is available. Retest.

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–60

NO.17 COOLING SYSTEM CONCERNS-OVERHEATING[L3 WITH TC]

id010339802300

Diagnostic procedure

17

COOLING SYSTEM CONCERNS -OVERHEATING

DESCRIPTION

Engine runs at higher than normal temperature/overheats.

POSSIBLE CAUSE

• Improper coolant level

• Blown fuse

• Coolant leakage (engine internal, turbocharger, external)

• Excessive A/C system pressure

• A/C system operation is improper

• Improper water/anti-freeze mixture

• Fans reverse rotation

• Poor radiator condition

• Thermostat malfunction

• Radiator hose damage

• Cooling fan inoperative

• Condenser fan inoperative

• Improper or damaged radiator cap

• Coolant overflow system malfunction

• Improper drive belt tension

• Drive belt damage

STEP

INSPECTION

RESULTS

ACTION

1

Inspect for the following:

• Engine coolant level

• Coolant leakage (around heater unit in 

passenger compartment, coolant hoses and/
or radiator.)

• Water and anti-freeze mixture

• Radiator condition

• Collapsed or restricted radiator hoses

• Radiator pressure cap

• Coolant overflow system

• Fan rotational direction

• Fan rotation direction

• Fuses

Are all items normal?

Yes

Go to the next step.

No

Service if necessary.
Repeat Step 1.Service if necessary.

2

Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position 
(Engine off).
Retrieve any DTCs.
Is there any DTCs displayed?

Yes

DTC is displayed:
Go to appropriate DTC test.

No

No DTC is displayed:
Go to the next step.

3

Perform the KOEO and KOER self-test function 
using the M-MDS.
(See01-02-10 KOEO/KOER SELF TEST[L3 
WITH TC].)
Is there any DTCs displayed?

Yes

DTC is displayed:
Go to appropriate DTC test.

No

No DTC is displayed: Go to the next step.

4

Start the engine and run it at idle speed.
Turn the A/C switch off.
Does the A/C compressor disengaged?

Yes

Go to the next step.

No

Go to symptom troubleshooting “NO.24 A/C ALWAYS 
ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.”
(See01-03-69 NO.24 A/C IS ALWAYS ON OR A/C 
COMPRESSOR RUNS CONTINUOUSLY[L3 WITH 
TC].)

5

Perform the Cooling Fan Control System 
Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)
Does the cooling fan system operate properly?

Yes

Go to the next step.

No

Repair or replace malfunctioning part, according to 
inspection results.

6

Is the drive belt normal?

Yes

Go to the next step.

No

Replace the drive belt.

7

Is there any leakage around heater unit in 
passenger compartment?

Yes

Inspect and service heater unit for leakage.

No

Go to the next step.

8

Is there any leakage at coolant hoses and/or 
radiator?

Yes

Replace the malfunctioning part.

No

Go to the next step.

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