LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Symptom Troubleshooting (Engine Control System L3)) >> No. 15 Emission Compliance >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
NO. 15 EMISSION COMPLIANCE DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 Inspect for following:
  • Vacuum lines for leakage or blockage
  • Electrical connections
  • Proper maintenance schedule followed
  • Intake-air system and air cleaner element concerns: obstructions, leakage or dirtiness

Are all items normal?		 Yes Go to the next step.
No Service if necessary.
Repeat Step 1.
2 Connect WDS or equivalent to DLC-2.
Turn ignition switch to ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?		 Yes DTC is displayed: 
Go to appropriate DTC test.
No No DTC is displayed: 
3 Is any other driveability concern present? Yes Go to appropriate symptom troubleshooting.
Go to the next step.
No Go to the next step.
4 Connect WDS or equivalent to DLC-2.
Access ECT PID.
Warm up engine and idle it.
Verify ECT PID is correct.
(See PCM INSPECTION .)
Is ECT PID correct?		 Yes Go to the next step.
No Inspect for coolant leakage, cooling fan and condenser fan operation or thermostat operation.
5 Perform Spark Test.
(See SPARK TEST (CALIFORNIA EMISSION REGULATION APPLICABLE ATX MODEL) .)
(See SPARK TEST (EXCEPT FOR CALIFORNIA EMISSION REGULATION APPLICABLE ATX MODEL) .)
Is the strong blue spark visible at each cylinder?		 Yes Inspect for the following:
  • Spark plugs malfunction
  • Improperly installed CMP sensor
  • Damage of trigger wheel on camshaft
  • Open or short circuit on CMP sensor
  • Open or short circuit between CMP sensor and PCM terminal 2(1), 28(1), 2J(2) or 2M(2)

Repair or replace malfunctioning parts.
If okay, go to the next step.
No Inspect the following:
  • High-tension leads(2)
  • Ignition coil and connector
6 Install fuel pressure gauge between fuel pipe and fuel distributor.
Start engine and idle it.
Measure fuel line pressure during idle.
Is fuel line pressure correct during idle?
(See FUEL LINE PRESSURE INSPECTION )		 Yes Go to the next step.
No Zero or low: 
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High: 
Replace fuel pump unit.
7 Remove and shake PCV valve.
Does PCV valve rattle		 Yes Go to the next step.
No Replace PCV valve.
8 Inspect for fuel saturation inside charcoal canister.
Is excess amount of liquid fuel present in canister?		 Yes Replace charcoal canister.
No Inspect fuel tank vent system.
9 Is there restriction in exhaust system? Yes Inspect exhaust system.
Then, go to the next step.
No Go to the next step.
10 Inspect three-way catalytic converter.
(See THREE-WAY CATALYTIC CONVERTER (TWC) INSPECTION .)
Is three-way catalytic converter normal?		 Yes Inspect EGR system.
(See EGR Control System Inspection .)
No Replace three-way catalytic converter.
11 Verify test results.
  • If okay, return to diagnostic index to service any additional symptoms.
  • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
    • If vehicle is repaired, troubleshooting completed.
    • If vehicle is not repaired or additional diagnostic information is not available, reprogram PCM if later calibration is available. Retest.
(1) California emission regulation applicable ATX model
(2) Except for California emission regulation applicable ATX model
scientia non olet · About LEMON Manuals