Mazda CX-7 2007 Workshop Manual page 348

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
STEP INSPECTION
12 Connect the M-MDS to DLC-2.
Access and monitor following PIDs using the
data monitor function.
• ECT
• MAF
• IAT
• IAT2
• APP
• TP
• MAP
• FP (Low side pressure line)
• VSS
Do the PIDs indicate correct values under
trouble condition?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
13 Inspect CMP and CKP sensor for 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 wiring harnesses Is
there any malfunction detected?
14 Remove and shake PCV valve.
Does the PCV valve rattle?
15 Inspect spark plug condition.
Is spark plug wet, covered with carbon or grayish
white?
16 Inspect for restriction in exhaust system and
three-way catalytic converter (TWC).
Is there any restriction?
17 Remove 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?
18 Inspect turbocharger compressor wheel locknut
is loose or has fallen down inside turbocharger.
Is there any problem?
19 Inspect turbocharger compressor wheel by
hand.
Does wheel turn easily and smoothly?
20 Inspect turbocharger turbine wheel is damaged,
cracked or interfering with housing on vehicle.
Note
• Inspect all fins on each turbine wheel.
Is there any problem?
21 Is any engine oil found inside turbocharger
turbine housing?
01-03–48
RESULTS
Yes Go to the next step.
No Inspect and repair or replace suspected parts and
related harnesses.
If the malfunction remains, perform the intermittent
concern troubleshooting procedure.
(See01-03-76 INTERMITTENT CONCERN
TROUBLESHOOTING[L3 WITH TC].)
Yes Repair or replace the malfunctioning part according to
the inspection results.
No Go to the next step.
Yes Go to the next step.
No Replace the PCV valve.
Yes Spark plug is wet or covered with carbon:
Perform the Spark Test and repair or replace
malfunctioning part according to inspection result.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Spark plug is grayish white:
Go to Step 23.
No Install spark plugs on original cylinders.
Go to the next step.
Yes Replace malfunctioning part.
No Go to the next step.
Yes Replace turbocharger.
No Go to the next step.
Yes Replace turbocharger.
No Go to the next step.
Yes Go to the next step.
No Replace turbocharger.
Yes Replace turbocharger.
No Go to the next step.
Yes Excessive amount of oil is found:
Replace turbocharger.
Small amount of oil is found:
Wipe oil out of vehicle, then Go to the next step.
No Go to the next step.
ACTION