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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 336 (Symptom Troubleshooting (Engine Control System AJ)) >> No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges >> 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. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • Verify following:
    • Vacuum connection
    • Air cleaner element
    • No air leakage from intake-air system
    • No restriction of intake-air system
    • Proper sealing of intake manifold and components attached to intake manifold: EGR valve
    • Ignition wiring
    • Fuel quality: proper octane, contamination, winter/summer blend
    • Electrical connections
    • Smooth operation of throttle valve
  • Are all items okay?
 Yes Go to the next step.
No Service as necessary.
Repeat Step 1.
2
  • Connect WDS or equivalent 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: 
  • Go to the next step.
3
  • Is engine overheating?
 Yes Go to symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING ".
No Go to the next step.
4
  • Connect WDS or equivalent to DLC-2.
  • Access APP1, APP2, RPM, MAF, TP_REL and VSS PIDs.
  • Drive vehicle while monitoring PIDs.
  • Are PIDs within specification?

    (See PCM INSPECTION .)

 Yes Go to the next step.
No APP1, APP2, PIDs: 

RPM PID: 

MAF PID: 

TP_REL PID: 

VSS PID: 
5
  • Visually inspect CKP sensor and teeth of crankshaft pulley.
  • Are CKP sensor and teeth of crankshaft pulley okay?
 Yes Go to the next step.
No Replace malfunctioning part.
6
  • Inspect spark plug conditions.
  • Is spark plug wet, covered with carbon or grayish white?
 Yes Spark plug is wet or covered with carbon: 
  • Inspect for fuel leakage from fuel injector.

Spark plug is grayish white: 
  • Inspect for clogged fuel injector.
No Install spark plugs on original cylinders.
Go to the next step.
7
  • Remove and shake PCV valve.
  • Does PCV valve rattle?
 Yes Go to the next step.
No Replace PCV valve.
8 Yes Go to the next step.
No Repair or replace malfunctioning part according to electronic throttle control system operation inspection results.
9
  • Inspect for restriction in the exhaust system.
  • Is there any restriction?
 Yes Inspect exhaust system.
No Go to the next step.
10
  • Install fuel pressure gauge between pulsation damper and fuel distributor.
  • Short the check connector terminal F/P to body GND using a jumper wire.

    (See AFTER REPAIR PROCEDURE .)

  • Turn ignition switch to ON position (Engine OFF).
  • Inspect fuel line pressure.

    (See FUEL LINE PRESSURE INSPECTION .)

  • Is fuel line pressure correct with ignition switch at ON position?
 Yes Go to the next step.
No Zero or low: 

High: 
11
  • Visually inspect for fuel leakage at fuel injector O-ring and fuel line.
  • Service if necessary.
  • Does fuel line pressure hold after ignition switch is turned to OFF position?

    (See FUEL LINE PRESSURE INSPECTION .)

 Yes Go to the next step.
No Inspect fuel injector.
(See FUEL INJECTOR INSPECTION [AJ] .)
12
NOTE:
  • The following test is for engine stall with A/C on. If other symptom exists, go to the next step.
  • Connect a pressure gauge to A/C low and high pressure side lines.
  • Turn A/C on and measure low side and high side pressures.
  • Are pressures within specifications?

    (See REFRIGERANT PRESSURE CHECK .)

 Yes Go to the next step.
No If A/C is always on, go to symptom troubleshooting "NO. 24 A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY ".
For other symptoms, inspect following:
  • Refrigerant charging amount
  • Condenser fan operation
13
NOTE:
  • Following test is performed for symptom with cruise control on. If other symptom exists, go to the next step.
  • Inspect cruise control system.
  • Is cruise control system okay?
 Yes Go to the next step.
No Repair or replace malfunctioning part.
14
  • Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side.
  • Plug opening end of vacuum hose.
  • Drive vehicle.
  • Does engine condition improve?
 Yes Inspect if purge solenoid valve is stuck open mechanically. Inspect EVAP control system.
No Go to the next step.
15
  • Visually inspect CMP sensor and projections of camshaft pulley.
  • Are CMP sensor and projections of camshaft pulley okay?
 Yes Go to the next step.
No Replace malfunctioning parts.
16
  • Inspect EGR system.
  • Is EGR system okay?
 Yes Go to the next step.
No Replace malfunctioning parts.
17 Yes Inspect following:
  • Valve timing
  • Internal transaxle part
No Inspect for cause.
18
  • 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.
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