![]() ![]() Check fuel pressure and fuel flow rate.Check the wiring and connection at oxygen sensor.Check for engine air leaks and exhaust leaks before the oxygen sensors.Voltage should cycle between 0.1-0.9 volts with engine speed at 2000rpm. Check operation using scanner, oscilloscope or Multimeter.(A smoke machine is recommended for this task)Ĭausing rich or lean engine conditions and may log oxygen sensor related codes P0130, P0131, P0132, P0133, P0134, p0135, P0150, P0151, P0152, P0153, P0154, P0155 etc and heater circuit codes. Check for air leaks, as they are very common especially inlet and plenum gaskets.Check oxygen sensors for correct operation.Check the fuel pressure and fuel flow is within specifications (420-460Kpa).Check for poor electrical connections at air mass meter.Problem: Air mass meter problems are very difficult to prove, so check the following: Remedy: Replace the IAC valve as required.Ĭausing rich or lean engine conditions, flat spot, hesitation and may log codes P0171, P0172, P0173, P0174 and P0175 (fuel trim limits reached), also cold start issues can occur. Check operation with scanner or oscilloscope. Idle speed 600-700RPM and should rise to 650-750 with engine loads. Idle speed problems caused by a sticking, slow or faulty IAC valve.Ĭheck resistance across IAC valve is 6-13 ohms. Camshaft sensor is located at the front of left cylinder head (front bank). It is Recommended to Replace Both Cam and Crank SensorsĬrankshaft sensor located on front timing cover accessible from under the vehicle. Remedy: Replace the crankshaft or camshaft sensor as required. Check wiring harness for damage particularly at the front of the engine. This signal is best checked with an oscilloscope. Crankshaft or camshaft sensor has no output signal. ![]() A faulty camshaft sensor may cause a lack of power and erratic engine running. Problem: A faulty crankshaft sensor may cause the vehicle to cut out and be hard to start. Symptom 4: Crankshaft and Camshaft sensorsĮngine check light illuminated, logging crankshaft sensor codes P0335, P0336, P0337, P0338, P0339 or camshaft sensor codes P0340, P0341, P0342 and P0344. (A smoke machine is recommended for this task). If code P0300 (random misfire) is logged, there may be an air leak usually caused by the inlet manifold and/or plenum chamber gaskets. This coil failure may be due to either the age of unit or premature failure as a result of air leaks causing coils to overload and oil leaks causing contamination of spark plug tubes. Problem: The most common fault we have found is the failure of ignition coils (COP- coil on plug). Customer may also complain of driveability issues such as, engine runs rough, lack of power, poor fuel economy, rough idle, etc. Ensure the inlet manifold and plenum chamber gaskets are not leaking as air leaks in this region are also very common.Įngine check light illuminated, logging trouble code P0301, P0302, P0303, P0304, P0305, P0306 (Cylinder misfire codes). To test for a leaking EGR valve temporarily block off valve with blanking gasket and recheck for lean air/fuel symptoms. Problem: The EGR valve leaks causing exhaust gases to enter the combustion chamber at all times, therefore creating a lean air/fuel mixture. Customer may also complain of rough idle, surging under light throttle, ignition misfire etc. The sensor is exposed to the elements of harsh exhaust gas and when the sensor fails the Check Engine Light will illuminate.Ĭheck the hoses at the DPFE sensor are not leaking or damaged and the EGR valve ports are free of restriction.Įngine check light illuminated, logging lean engine condition trouble codes. The DPFE sensor monitors function of the EGR valve by measuring flow changes in the exhaust gas recirculation (EGR) system. Customer may also complain of driveability issues, such as pinging (knock), surging, lack of power, poor fuel economy, rough idle, etc. Symptom 1: DFPE Sensor (Differential Pressure Feedback EGR)Įngine check light illuminated, commonly logging trouble code P0401 (Exhaust Gas Recirculation insufficient flow detected) and P1401 (DFPE sensor signal high). You can download all the information for this Tech Tip, Click here. Listed below are some common problems and remedies. Mazda Tribute/Ford Escape V6 common problemsĪs this model has been in Australia for over 10 years, we are now getting many tech calls relating to the Mazda Tribute/Ford Escape V6. ![]()
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