Filed Under (Mazda) by admin on 19-11-2010
1. Check the mass air flow sensor for damage and cracks. 2. Connect the New Generation Star tester to the data link connector. 3. Turn the ignition switch to ON. 4. Select the “PID/DATA MONITOR AND RECORD” function on the NGS tester display and press TRIGGER. 5. Select “MAF V” on the NGS tester display and press START. The NGS tester measures and show the voltage. 6. If not as specified, inspect the following. (1) Harness continuity Between PCM terminal 88 and mass air flow sensor terminal E Between PCM terminal 36 and mass air flow sensor terminal D Between PCM terminal 103 and mass air flow sensor terminal C Between main relay terminal E and mass air flow sensor terminal B (2) Terminal voltage Mass air flow sensor terminal B voltage: Battery positive voltage Mass air flow sensor terminal C voltage: Below 1.0 V 7. If the terminal voltage is correct and there is harness continuity, replace the mass air flow sensor.
Filed Under (Mazda) by admin on 15-11-2010
MIL ILLUMINATION WITH P0171, P1170, LACK OF POWER, HESITATION APPLICABLE MODEL(S)/VINs All 1999-2000 Protege 1.6L with VINs lower than JM1 BJ222* *0 300996. DESCRIPTION Some vehicles may exhibit MIL illumination with any of the following symptoms: DTC P0171, DTC P1170, Lack of power, Hesitation, Unstable idle. These conditions may be caused by contamination of the mass air flow sensor wires. Customers having this concern should have their vehicle repaired using the following procedure. REPAIR PROCEDURE 1. Verify customer concern. 2. Record DTC and Freeze Frame data. 3. Inspect intake system for vacuum leaks. 4. Identify production date on MAF sensor. – If MAF sensor has a production date before 07B27 (July 27, 2000), proceed to STEP 5. – If MAF sensor has a production date on or after 07B27 (July 27, 2000), this Service Bulletin does not apply. Refer to Workshop Manual for further diagnostic procedures. 5. Clean surface surrounding MAF sensor. 6. Replace MAF sensor. Note: Make sure 0-ring is correctly positioned on replacement MAF sensor before installation. Caution: ^ Do not allow water to enter MAF sensor connector. ^ Handle replacement MAF sensor with care. 7. Inspect air cleaner and correct any unfiltered air leaks: ^ Improperly positioned air cleaner element and/or deformed seal. ^ Broken tabs, cracks and/or deformities of the air cleaner. 8. Disconnect negative battery cable or pull INJ fuse to erase and reset KAM (Keep Alive Memory). 9. Verify repair.
Filed Under (Ford) by admin on 21-10-2010
PURPOSE The Mass Air Flow (MAF) sensor directly measures the mass of air flowing into the engine. LOCATION Between the air filter housing and throttle body assembly. CONSTRUCTION The sensing element is a thin platinum wire wound on a ceramic bobbin and coated with glass. OPERATION The MAF operates on the principle that if a mass is maintained at a constant temperature above ambient, the thermal loss is proportional to the mass flow of the cooling medium it is subjected to. The sensor output is a DC (analog) signal ranging from 0.5 to 5.0 volts used by the Electronic Control Assembly (ECA) to calculate fuel injector pulse width for stoichiometry (14.7 to 1). The “hot wire” is maintained at 392°F (200°C) above
Filed Under (BMW) by admin on 02-09-2010
Removing intake air housing with mass air flow sensor, refer to Powertrain Management. Remove bulkhead heater (air collector). This operation is described in section on removing complete wiper console, refer to Wiper and Washer Systems. Place cable channel to one side. Remove adapter from brake force booster. Remove cover from injection valves. Unclip plug connections from oxygen sensors. Unfasten plug connection from VANOS solenoid valve. Lift connector strip off injection valves and place to one side
Filed Under (BMW) by admin on 25-08-2010
Removing intake filter housing with mass air flow sensor, refer to Powertrain Management Removing cylinder head cover, refer to Valve Cover Removing all spark plugs. Removing intake air manifold, refer to Intake Manifold Removing VANOS adjustment unit, refer to Camshaft, Lifters and Pushrods, Camshaft, Engine. Unfastening sensor for cylinder recognition, refer to Powertrain Management, Cylinder Identification Sensor, Service and Repair. Drain off coolant and dispose of correctly. Installation: Tightening torque, refer to Engine Specifications Bleeding cooling system and checking for water leaks, refer to Cooling System Remove exhaust pipe from exhaust manifold. Release water hose from branch flange. Unfasten heating intake and heating return hoses. Removal of cylinder head is described separately from installation. Assembly sequence for removal and installation is different. Unfasten screws and remove washer from exhaust camshaft. Unfasten nuts from thrust washer (intake camshaft).