Mazda CX-7 2007 Workshop Manual page 344

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
STEP INSPECTION
9 Perform the TP sweep inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the electronic throttle control system work
properly?
10 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?
11 Perform the Purge Control System Operation
Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the purge control system work properly?
12 Perform the Fuel Pump Speed Control
Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the fuel pump speed control work
properly?
13 Perform the Wastegate Control System
Operation Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Does the wastegate control system work
properly?
14 Remove the parts necessary to inspect
turbocharger without removing the turbocharger.
Inspect if turbocharger compressor wheel is
bent, damaged, or interfering with housing on
vehicle.
(See01-13-17 TURBOCHARGER
INSPECTION[L3 WITH TC].)
Is there any problem?
15 Inspect the turbocharger compressor wheel
locknut is loose or has fallen down inside
turbocharger.
Is there any problem?
16 Inspect turbocharger compressor wheel by
hand.
Does the wheel turn easily and smoothly?
17 Inspect the turbocharger turbine wheel is
damaged, cracked or interfering with housing on
vehicle.
Note
• Inspect all fins on each turbine wheel.
Is there any problem?
18 Is any engine oil found inside turbocharger
turbine housing?
19 Is any engine oil found inside turbocharger
compressor housing?
20 Inspect for restriction in the exhaust system and
three-way catalytic converter (TWC).
Is there any restriction?
21 Remove and shake the PCV valve.
Does the PCV valve rattle?
01-03–44
RESULTS
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.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Go to the next step.
No Inspect or replace the malfunctioning parts, according
to the inspection results.
Yes Replace the turbocharger.
No Go to the next step.
Yes Replace the turbocharger.
No Go to the next step.
Yes Go to the next step.
No Replace the turbocharger.
Yes Replace the turbocharger.
No Go to the next step.
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.
Yes Wipe oil out vehicle and install all removed parts in
Step 14. Then, go to the next step.
No Turbocharger is normal.
Install all parts removed in Step 14.
Then, go to the next step.
Yes Replace the malfunctioning part.
No Go to the next step.
Yes Go to the next step.
No Replace the PCV valve.
ACTION