![]() The PCM then sends that signal to the dash. the coolant temperature sensor signal goes directly to the PCM. If none of that is happening, then it's possible that it's because the PCM isn't doing its job.Ģ) Here's the kicker. I say this for two reasons:ġ) the PCM not only turns the fuel pump on, but it also controls all aspects of both injection and spark. Honestly, at this point, I wouldn't rule out the possibility that the PCM(ECU) is somehow dead. I just deleted a paragraph i was writing on how to go about troubleshooting that the relay is getting power, and that the fuel pump itself is good by applying power directly at the pump, but it's really impossible to walk though the needed troubleshooting in a forum post. ![]() If you get that working, and your car starts, then you're good to go!ĭo you have a factory service manual? It's got the wiring diagrams, troubleshooting steps, harness pinouts (for reference) and other good stuff like that. Why? because there aren't nearly as many factors that control whether your fuel pump turns on. Your lack of fuel pressure is your main concern. At this point, I wouldn't worry about the spark plugs just yet. try some of that and let us know what you find. The ECU should still give the OK to start with a bad temp sensor-will most likely give a check engine light, though. try unplugging the engine coolant outlet water temperature sensor (this is the one that tells the computer how hot the engine is). If the temp gauge is always at hot, even after hours of not driving, then the sensor could be bad. bad relay (try switching it out for something less useful, like the A/C relay, if they're the same) faulty wiring (shorting to ground, which would cause a blown fuse) no prime pulse signal from the ECU (could be back to the 'bad ECU' idea above) So you put the key in and turned it to "on"? Did you wait and listen for the fuel pump prime pulse before starting to crank? What have you done to determine that the fuel pump is not getting electricity? cam position sensor is bad (the sensor is on the left side of the valve cover on the 2.0L) otherwise it won't spark even if it's good. did you check more than one plug? Make sure that you hold the spark plug against the engine block or a good ground when checking. I would not just to this conclusion unless it was only 1 coil that wasn't sparking. Without looking at ECU flowcharts (you'd have to work for Mazda to get them), I don't think that the temp gauge pegged at hot would stop the car from starting. Feel Free to contact me at FixYa.This can be one of the most frustrating problems to diagnose. Let me know if this helped, or if you have additional information questions. Included are Instructional Diagrams for loosening (for removal) and tightening (for replacement) using the Adjustment and Locking Bolts/Nuts. It has the Belt Diagrams for your 2002 Mazda Protege 5 2.0L DOHC In-Line 4-Cylinder Engine along with various engine options (AC/No AC, etc.). Included are Instrucional Diagrams for loosening (for removal) and tightening (for replacement) using the Adjustment and Locking Bolts/Nuts. It has the Belt Diagrams for the 1997 Mazda Protege with either the 1.5L DOHC In-Line 4-Cylinder or 1.8L DOHC In-Line 4-Cylinder Engines along with various engine options (AC/No AC, etc.). Both are included Below Click on the following free direct Link. Posted by Asker under 1997 Mazda Protege for their 2002 Mazda Protege 5. When a defect occurs in the EGR system,Ī diagnostic trouble code (DTC) is usually set in the powertrain Is present, the engine may hesitate on low-speed acceleration or stallĪfter deceleration or after a cold start. Operation is rough and surging occurs at low speeds. If the EGR valve remains open at idle and low engine speed, the idle ![]() Sensor, the wires routed to it should also be checked. System if fitted with an exhaust-gas-recirculation valve position (EVP) (See the underhood decal or the manufacturer's service manualįor correct routing.) Correct any misrouted hoses. Before attempting any tests of the EGR system, visually inspect theĬondition of all vacuum hoses for kinks, bends, cracks, andįlexibility. Incorrectly, perform the necessary tests and services to correct the If one or more of these conditions is faulty or operating Mechanical-vacuum advance is properly adjusted or the electronic advance system is operating properly.Injection system is operating properly.Should be checked and be within specifications. Recirculation (EGR) system on a vehicle, the following conditions Hi, HOW TO INSPECT EGR VALVE Before attempting to troubleshoot or repair a suspected exhaust gas ![]()
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