Mazda 6 Workshop Manual page 240

Diagnostic Procedure
STEP
1 Is the engine overheating?
2 Does the engine run cold?
3 Connect the WDS or equivalent to the DLC-2.
Perform the self-test function using the WDS or
equivalent.
Turn the engine switch to the ON position.
Retrieve any DTC.
Is the DTC displayed?
4 Inspect for the following:
• Fuel quality (such as including water
contamination, winter/summer blend)
• Fuel return line clogging and/or restriction
• Charge air cooler condition (restriction or
damaged)
• Intake-air system restriction
• Exhaust system and/or catalyst converter
restriction
• Vacuum leakage
Are all the items normal?
5 Inspect the adjustment of the accelerator
position sensor and the idle switch.
Are the accelerator position sensor and the idle
switch adjusted correctly?
6 Inspect the neutral switch adjustment.
Is the neutral switch adjusted correctly?
7 Inspect the intake shutter valve and the VSC
valve operations.
Is there any problem?
8 Inspect the guide blade valve operation.
Is there any problem?
9 Inspect the hose bands between following parts:
• Turbocharger compressor housing and air
cleaner
• Turbocharger compressor housing and
charge air cooler
Are the hose bands loose?
10 Inspect for improper operation, kinks, clogging
or disconnection on the guide blade actuator.
Is the actuator normal?
11 Remove the parts necessary to inspect the
turbocharger.
Do not remove the turbocharger.
Inspect if the turbocharger compressor wheel is
bent, damaged, or interfering with the housing
on the vehicle.
Is there any problem?
12 Inspect if the turbocharger compressor wheel
locknut is loose or has fallen into the
turbocharger.
Is there any problem?
F2–228
TROUBLESHOOTING
INSPECTION RESULTS
Yes Go to the symptom troubleshooting "NO.17 COOLING
SYSTEM CONCERNS—OVERHEATING".
No Go to the next step.
Yes Go to the symptom troubleshooting "NO.18 COOLING
SYSTEM CONCERNS—RUNS COLD".
No Go to the next step.
Yes DTC is displayed:
Go to appropriate DTC test.
Communication error message is displayed:
Inspect for the following:
• Open circuit between PCM control relay and PCM
terminal 53 or 79
• Open circuit PCM control relay and PCM terminal
69
• PCM control relay stuck open
• Open or poor GND circuit (PCM terminal 65, 85,
103 or 104)
• Poor connection vehicle body GND
No No DTC is displayed:
Go to the next step.
Yes Go to the next step.
No Service if necessary.
Repeat Step 4.
Yes Go to the next step.
No Adjust the accelerator position sensor and the idle
switch correctly.
Yes Go to the next step.
No Adjust the neutral switch correctly.
Yes Repair or replace if necessary.
No Go to the next step.
Yes Repair or replace if necessary.
No Go to the next step.
Yes Retighten the hose bands.
If the concern is resolved, complete the inspection.
If the concern still exists, go to the next step.
No Go to the next step.
Yes Go to the next step.
No Repair or replace if necessary.
If the concern is resolved, complete the inspection.
If the concern still exists, the turbocharger is normal.
Go to the next step.
Yes Replace the turbocharger.
No Go to the next step.
Yes Replace the turbocharger.
No Go to the next step.
ACTION