when ignition is on it should be battery volts,when cranking in should pulse..(test with a led test light or osilliscope
when cranking the engine the battery voltage should not fall below 9.6volts if so replace battery
P0200 Injector Circuit Malfunction Check the connections to each injector first. Then check voltage to each injector.
Voltage flow into a starter motor, never out of it. Use the voltmeter to measure the voltage at the starter motor before starting to crank and then whilst it is cranking. (Before cranking, the voltage appears across the starter motor relay only.)
A saturated fuel injector is also known as a High Impedance (or High z) fuel injector. The high z injector has a larger ohm draw through the coil (12v-15v) vs. a peak-hold (Low Impedance, Low z) injector, which is 2v-4v. Another difference is the how the injector uses the voltage to open the injector. A high z injector uses the full voltage to open and hold open the injector, therefore it voltage saturated. A low z injector (peak-hold) has a peak of high voltage to open then injector then uses a lower voltage to keep the injector open for the remainder of it's cycle. What this means to you, the low z injectors typically needs a resistor in line to add the necessary resistance to properly drive the system, otherwise the injectors could overheat to fatigue. A high z injector does not need a resistor.
voltage spike, bad computer, dirt/grit in fuel line plugging injector,
Fuel injector is energize by signal composed of pulsed voltage frequency increases as with rpm set by pcm
Possible failed injector.
Info can be found here http://www.allpar.com/fix/80s-codes.html26 Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors) (SEE NOTE #4 BELOW)NOTE #4.During cranking, the computer will test the current through the injector to see whether there's too much resistance in the injector's path. If there is, code 26 is set.The problem may be cured with tuner cleaner on the connectors.For TBI engines, the injector's cold resistance should be between 0.9 and 1.2 ohms (specs vary with year). This is a peak-and-hold injector. With the engine idling the peak period should be about 1.2 milliseconds whereas the hold period will vary. If it's lower than this at idle, then the injector's shorted or there's a defect in the injector driver circuit. (Bohdan Bodnar)
Check fuel injectors at the harness plug at the injector, with key ON, engine off. There will be 2 wires at the injector plug, 1 while using a ohm and volt meter, and 1 wire should have battery voltage with key on at all times, the other wire use a test light and back probe while someone else is cranking the motor the test light should blink on and off, while cranking. If the test light in not blinking during the cranking you most likely need an ECM Module. Your fuel injectors gets there ground pulse from the ECM so if you have fuel pressure, ignition, and spark and 12 volts at the injector but no ground replace the ECM. Hope this helps!!
Presumably you mean slow cranking. Check for weak battery or bad starter. If not slow cranking so much as long cranking time check for loss of fuel pressure overnight using fuel pressure gauge. If so, suspect leaking injector or possibly leaking regulator.
To check if injectors are getting power, you can use a multimeter to measure voltage at the injector connector while the engine is cranking. Set the multimeter to the DC voltage setting and probe the connector terminals; you should see a voltage reading (typically around 12 volts) if the injectors are receiving power. Additionally, you can listen for a clicking sound from the injectors while an assistant cranks the engine, indicating they are being activated. If there is no voltage or clicking, further investigation into the wiring, fuses, or engine control unit may be necessary.
To test the electrics to the injectors on a Peugeot 406 HDi, you should first check the injector connectors for proper voltage using a multimeter while cranking the engine; you should see around 12V at the connector during cranking. Next, check for continuity in the wiring from the ECU to each injector. Additionally, verify the ECU's operation and ground connections, as a faulty ECU can prevent injector firing. Other likely causes for the engine not firing could include a lack of compression, fuel pressure issues, or a malfunctioning crankshaft position sensor, which can also be tested with appropriate diagnostic equipment.