mk7 fault codes

[johnson]

Hi my mk7 transit come up with these codes when i put it on my fault finder and thay are po200_ po100_ and po300 so what do the codes meen and is this why my van will not start.my van did come up befor with the code po300 and that was about 4 months ago and it was running ok just didnt have the power it did have but now these other codes have come up now my van will not start so which one would stop my van from going and what can i do or has it got to be done at a garage? Any help would really help me out.thanks. Darren

[karl]

Po200 Injector Circuit Malfunction What does that mean? In sequential fuel injection the PCM (Powertrain Control Module) controls each injector individually. Battery voltage is supplied to each injector from, usually, the power distribution center (PDC) or other fused source. The PCM supplies the ground circuit to each injector by means of an internal switch called a "driver". The PCM monitors each driver circuit for faults. For example, when a fuel injector is commanded "off" by the PCM, it expects to see a high voltage on the driver ground circuit. Conversely, when a fuel injector is commanded "on" by the PCM, it expects to see the voltage pulled low on the driver circuit If it doesn't see this expected condition on the driver circuit, P0200 or P1222 may set. Other injector circuit fault codes may set as well. Symptoms Symptoms of a P0200 DTC may include: MIL (Malfunction Indicator Lamp) illumination Engine misfire at idle or at highway speed Engine may start and stall or not start at all Cylinder misfire codes may be present Causes Potential causes of an P0200 code include: Open or shorted injector Injector low internal resistance (basically an injector that works, but is out of specs) Grounded driver circuit Open driver circuit Driver circuit shorted to voltage Wiring harness intermittently shorting against underhood components Possible Solutions 1. If you have multiple misfire/injector codes, a good first step is to unplug all the fuel injectors and then turn the ignition on, engine off (KOEO). Check for presence of battery voltage (12 Volts) at one wire of each injector connector. If all are missing, check for continuity to ground on the voltage circuit by using a test light connected to positive battery and probe each voltage feed. If it lights up, then there is a short to ground on the voltage feed causing a short. Get a wiring diagram and repair the short on the voltage feed and reestablish proper battery voltage. (Don't forget to check for a blown fuse and replace as necessary). NOTE: It's possible for one injector to short out the whole battery voltage feed to all the injectors. So if you have lost voltage to all the injectors, replace the blown fuse and plug each injector in, one by one. If the fuse blows, the last injector you plugged in is shorted. Replace it and retest. If only one or two battery feeds are missing, then it's more likely to be a shorted battery voltage feed in the individual injector wiring harness. Inspect and repair as necessary. 2. If you have battery voltage fed to each injector harness, then the next step is to get a noid light to check for injector driver operation. A noid light will insert into the injector harness in place of the fuel injector and flash rapidly when the injector driver operates. Check each fuel injector connector. If the noid light flashes rapidly then suspect the injector. Ohm each fuel injector if you have a resistance specification. If the injector is open or the resistance is higher or lower than the spec, replace the fuel injector. If the injector tests out, the problem is likely an intermittent wiring problem. (Remember that a fuel injector can work properly when cold but go open when hot, or vice versa. So it's best to do these checks when the problem is occurring). Check the wiring harness for any chafing, or the injector connector for loose pins or a broken lock. Repair as necessary and retest. Now, if the noid light doesn't flash, then there's a problem with the driver or the driver circuit. Unplug the PCM connector and ohm the fuel injector driver circuits. Any resistance means there's a problem. Infinite resistance points to an open in the circuit. Find it and repair it, then retest. If you can find no problem with the harness and there is no fuel injector driver operation, then check the PCM powers and grounds. If they are okay, the PCM may be at fault.


Po100
Mass Air Flow (MAF) Circuit Malfunction What does that mean? Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. Other MAF sensor circuit DTC trouble codes are P0101, P0102, P0103, and P0104. Symptoms You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness. Causes A code P0100 may mean that one or more of the following has happened: The MAF may be disconnected, or a wiring connection may be bad The MAF sensor may be faulty Possible Solutions The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. Unplug and reconnect the MAF wiring harness Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) Replace the MAF sensor


po300

Is misfire

[johnson]

Because that code po200 come up on my vault finder do you think thats the reson my van stop going because it was stumdling on the motor ways and just befor it stop going all together.that code never come up befor the po300 did but i didnt mind cause i never went over 70 it was just slow up hills or when i had a load on but i never let me down intill now so is it because of the code po200 and what will it need to get the code off if it is that why the van stop??? Any one know what i need to do

[apples26]

good info karl very helpful, there should be a section full of info like that