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Home >> Mazda >> 2006 >> 6 s, 4D Wagon, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Symptom Troubleshooting [Engine Control System L3 With TC)) >> No. 19 Excessive Black Smoke >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different variant/trim than selected.
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 What color is smoke coming from the exhaust system? Blue Burning oil is indicated.
Go to the next step.
White Water in combustion is indicated.
Go to the Step 5.
Black Rich fuel mixture is indicating.
Go to the Step 6.
2 Remove and shake the PCV valve.
Does the PCV valve rattle?		 Yes Go to the next step.
No Replace the PCV valve.
3 Remove the parts necessary to inspect turbocharger without remove the turbocharger.
Visually inspect for the turbocharger compressor housing.
Is any engine oil found inside turbocharger compressor housing?		 Yes Install all parts removed in this step.
Perform the following, according to inspection results. 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 Turbocharger is normal.
Install all parts removed in this step.
Then, Go to the next step.
4 Inspect for the following engine internal parts.
  • Damaged valve guide, stems or valve seals
  • Blocked oil drain passage in cylinder head
  • Piston ring is not seated, seized or worn
  • Damage cylinder bore

Are there ant problem found?		 Yes Repair or replace suspected parts, according to the inspection results.
No Engine internal parts are normal.
If other driveability symptoms are present, return to diagnostic index to service additional symptoms.
5 Does cooling system hold the coolant pressure?
(See ENGINE COOLANT LEAKAGE INSPECTION ).		 Yes Inspect for the following:
  • Cylinder head gasket leakage
  • Intake manifold gasket leakage
  • Cracked or porous engine block

If other driveability symptoms are present, return to diagnostic index to service additional symptoms.
No Inspect for the cause.
6 Inspect for the following for intake-air system.
  • Air cleaner restriction
  • Collapsed or restricted
  • Leakage

Are all items normal?		 Yes Go to the next step.
No Repair or replace the suspected part.
7 Connect the WDS or equivalent to the DLC-2.
Access following PIDs.
  • ECT
  • MAF
  • IAT
  • IAT2
  • APP
  • TP
  • MAP
  • VSS
  • 2S11
  • O2S12
  • LONGFT1
  • SHTFT1
  • PNP (PCM terminal 1W)
  • CPP (PCM terminal 1H)

Monitor the PIDs under the black smoke appeared engine condition.
Do all PID indicate normal according to engine conditions?		 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.
(See INTERMITTENT CONCERN TROUBLESHOOTING ).
8 Inspect the wastegate.
(See WASTEGATE CONTROL SOLENOID VALVE INSPECTION ).
Does the wastegate stuck open?		 Yes Perform the wastegate control system operation inspection.
(See WASTEGATE CONTROL SYSTEM OPERATION INSPECTION ).
Repair or replace malfunctioning part according to the inspection results.
No Go to the next step.
9 Connect the WDS or equivalent to DLC-2.
Access and monitor following PIDs using the data monitor function.
  • ECT
  • MAF
  • IAT
  • IAT2
  • APP
  • TP
  • MAP
  • VSS
  • CPP (PCM terminal 1H)
  • PNP (PCM terminal 1W)
  • O2S11
  • O2S12
  • LONGFT1
  • SHTFT1

Do the PIDs indicate correct values under trouble condition?
(See USING THE WDS OR EQUIVALENT ).		 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.
(See INTERMITTENT CONCERN TROUBLESHOOTING ).
10 Access and monitor the FUEL_PRES PID Is the FUEL_PRES PID value within the specification?
(See USING THE WDS OR EQUIVALENT )		 Yes Go to Step 14.
No Go to the next step.
11 Is vehicle accelerate performance normally? Yes Go to the next step.
No Go to Step 13.
12 Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION ).
Is the fuel pressure sensor normal?		 Yes Go to Step 14.,
No Replace the delivery pipe.
13 Replace the high pressure fuel pump.
Monitor FUEL_PRES PID.
Is the FUEL_PRES PID value within the specified?
(See USING THE WDS OR EQUIVALENT ).		 Yes Troubleshooting is completed.
Retest Step 16.
No Go to the next step.
14 Perform the spark test.
(See SPARK TEST ).
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.
15 Measure the compression pressure for each cylinder.
(See COMPRESSION INSPECTION ).
Are compression pressures within the specification?		 Yes Inspect the fuel injector for each cylinder.
(See FUEL INJECTOR INSPECTION ).
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.
16 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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