Mercedes Mullins
The stock injectors for the 03 636 are high-impedance 12-ohm injectors that run on 12.5 volts. If the injectors have close to 12 ohms of resistance but the ECU output is not 12.5 volts, the drivers are likely burnt out. This could be due to someone putting low-impedance injectors, wiring the primary and secondary injectors together, or the ECU not getting enough airflow. To test the outputs from the ECU, you can use a scope with glitch capture or record options and review the waveform voltage to identify the exact issue.
| Characteristics | Values |
|---|---|
| Stock injectors | High-impedance 12-ohm injectors |
| Voltage | 12.5 volts |
| ECU output voltage | 12 volts |
| Fuel pressure | 36 psi |
| Minimum voltage for fuel injectors during cranking | 6-7 volts |
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What You'll Learn
The stock injectors are high-impedance 12-ohm injectors
The stock injectors on a 2004 zx636 are high-impedance 12-ohm injectors. They require 12.5 volts to run. If the injectors have close to 12 ohms of resistance, but the ECU output is not 12.5 volts, then the drivers are likely burnt out. This could be due to someone installing low-impedance injectors, wiring the primary and secondary injectors together in parallel, or the ECU not getting enough airflow.
To test the voltage of your fuel injectors, you can use a voltmeter to measure the voltage at the battery terminals. If the battery has a charge but the injectors are not receiving enough voltage, there may be an issue with the starter using too much power, or there could be a bad connection on the ground cable.
It is important to note that a failing injector won't deliver the right amount of fuel at the right time. However, even a functional injector won't work correctly if it isn't getting the oil it needs to operate. Upstream issues with the HPOP, oil standpipes, oil rails, or FICM can cause problems with the injectors. Additionally, a malfunctioning oil cooler can lead to injector problems by reducing the amount and quality of oil available.
To diagnose issues with your fuel injectors, you can try using a quick spray of starting fluid or ether. If the engine fires up and stays running, it indicates that the issue is specifically related to fuel delivery during cranking. You can then probe the +12V source coming off the automatic self-destruct relay to check the supply voltage.
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The injectors require 12.5 volts to run
The 03 636 fuel injectors are high-impedance 12-ohm injectors and require 12.5 volts to run. If the injectors have close to 12 ohms of resistance, but the ECU output is not 12.5 volts, then the drivers are likely burnt out. This can happen if the ECU wasn't getting proper airflow and cooked.
It is important to note that the voltage requirements for fuel injectors can vary depending on the specific application and the type of fuel injection system being used. For example, some modern diesel engines use common rail systems that require much higher pressures and voltages to operate than a typical gasoline engine.
In general, fuel injectors require a certain voltage to function properly. If the voltage is too low, the injectors may not open, resulting in insufficient fuel delivery to the engine. This can cause the engine to run poorly or not start at all.
To test the voltage of your fuel injectors, you can use a voltmeter to measure the voltage at the injectors while the engine is running. If the voltage is significantly lower than expected, there may be an issue with the electrical system, such as a faulty ECU or a problem with the wiring.
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The ECU may not be outputting 12.5 volts
If your 03 636 fuel injectors are not receiving 12.5 volts, it could be due to a faulty ECU (Engine Control Unit). The ECU may not be outputting the required voltage, leading to issues with the fuel injectors. Here are some possible reasons and solutions:
- Voltage Fluctuations: Most modern ECUs operate within a voltage range of 9 to 16 volts, with an optimal range of 12 to 14 volts. If the ECU's voltage falls below 9 volts or fluctuates erratically, it can cause malfunctions. Check the ECU's voltage using a voltmeter connected to its wiring harness. If the voltage is inconsistent or too low, you may need to replace or repair the ECU.
- Weak Battery or Poor Connections: A weak battery or faulty connections can mimic ECU problems. Use a multimeter to test the battery voltage. If it reads below the specified range, you may need to replace the battery or address connection issues.
- Fuse and Relay Issues: Faulty fuses or relays connected to the ECU can disrupt the power supply. Check for blown fuses and test the relays. Replace any faulty components to restore proper power delivery to the ECU.
- Wiring Damage: Inspect the wiring leading to the ECU for any visible damage or issues with the insulation. Damaged wiring can affect the power supply and ECU performance.
- Low Compression: If your motorcycle's engine is not getting enough compression, it may not start. Check the engine's compression to ensure it is within the specified range.
- Safety Switch Issue: The problem could be related to safety switches, such as the neutral safety switch or kick-down switch. Ensure these switches are functioning correctly and are not preventing the engine from starting.
If you have checked all the above and the issue persists, it may be necessary to consult a professional mechanic or seek further advice from a Kawasaki-specific forum, as there could be other factors at play. Remember to exercise caution and refer to your owner's manual when performing any diagnostics or repairs.
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The drivers may be burnt out
If your 03 636 fuel injectors are not receiving 12 volts, it could be that the drivers are burnt out. This could be due to a few reasons.
Firstly, the injectors may have close to 12 ohms of resistance, but the ECU (engine control unit) is not outputting 12.5 volts. This could be because the ECU wasn't getting proper airflow and cooked. Alternatively, someone may have put in low-impedance injectors or wired the primary and secondary injectors on each channel together in parallel, resulting in a 6-ohm draw.
To test the outputs from the ECU, you can use a scope with a glitch capture or record option to review the waveform voltage. This should tell you exactly what is happening.
If the drivers are burnt out, you will need to replace them. It is important to keep fuel injectors in good condition as they are an essential part of engine function. Dirty or malfunctioning injectors can cause issues such as rough idling, engine stalling, decreased fuel efficiency, and trouble starting the car. In some cases, fuel injector issues can even lead to engine failure.
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The ECU may not be getting proper airflow
If your 03 636 fuel injectors are not 12 volts, it could be due to a problem with the ECU (Engine Control Unit). One possible reason for this issue is that the ECU may not be getting proper airflow, which can lead to overheating and malfunction.
To understand this issue, it is important to know how the ECU works. The ECU is responsible for controlling the injection of fuel and the timing of the spark to ignite it. It relies on various sensors, such as the Mass Air Flow (MAF) sensor, to collect data and make decisions. For example, when you press the accelerator pedal, the throttle flap opens to allow more air into the engine. The MAF sensor measures this increase in airflow, and the ECU uses this information to adjust the amount of fuel injected, maintaining the correct mixture ratio.
If the ECU is not getting proper airflow, it can affect its ability to function optimally. Insufficient airflow can lead to overheating, as the ECU may not be able to compensate for the increased engine demand. This can result in erratic behaviour or even failure of the ECU. Additionally, low compression, which can be caused by insufficient airflow, can lead to issues with the fuel injection system.
To diagnose the issue, you can use a multimeter to test the voltage across the ECU's power and ground connections. If the voltage is consistently below 9 volts or fluctuates erratically, it is likely causing problems with the ECU. You should also check for any faulty sensors, such as the MAF sensor, as they can imitate ECU failure symptoms. In some cases, replacing the sensor might solve the problem without needing to address the ECU itself.
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Frequently asked questions
If your 03 636 fuel injectors are not working, you should first check the voltage. If there is no voltage, you can try using a starting fluid to confirm the no injection. If there is low compression, you may need to replace the ECU.
Your fuel injectors should have a voltage of 12 volts when cranking and running. If the voltage drops below 6-7 volts, there may not be enough power to open the injectors.
There could be several reasons why your fuel injectors are not working, including low oil, issues with the HPOP, oil standpipes, oil rails, or FICM, or a malfunctioning oil cooler.
If your fuel injectors are failing, they may not deliver the right amount of fuel at the right time. This could be due to a problem with the injectors themselves or another issue with the fuel delivery system.
