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How To Test a Subaru Forester Ignition Coil
Legacy Accessories. Built to perform and last with custom-fit and function. Wherever adventure in your Subaru Legacy leads, stay plugged in. Comfort and Convenience. Less difficulty. More enjoyment.Quick Links. See also: Service ManualOwner's Manual. Table of Contents. Repair the trouble parts.
NOTE: Use copies of this page for interviewing customers. Date of sale Fuel brand Date of repair Odometer reading Page 8 Calling the self-diagnosis result is performed by the performing diagnostics. Subaru Select Monitor. Unit Data — Integrated unit data update Body Int. EN H4SO 2.
Page 34 Data reception signal Body Int. When counter update signal is Counter update signal Body Int. When performing trouble diagnosis which is not shown in the DTC table, refer to the next item Drive cycle. Page 38 2. Driving in the specified pattern allows to diagnose malfunctioning items listed below.
After the malfunctioning items listed below are repaired, always check whether they correctly resume their functions by driving in the required drive pattern.
Activation of malfunction indicator light.
Check that the malfunction indicator light does not come on. Check for fuel amount. Inspection of starter motor circuit. Is the resistance less than 5 Go to step 9.2009 Subaru Forester 2.5L: Replacing the spark plugs and spark plug wires
Is the voltage more than 10 V?P is a generic OBD2 code, which means that it means the same thing for the Subaru Legacy as it would any other vehicle. It is typically caused by a bad coil pack or wiring harness issue, although there can be other causes as well.
A short, open, or poorly ground wiring harness is almost always what causes P when it is the primary wiring side that has thrown the code. The secondary side of the equation is the spark side. Which means that plugs, plug wires if so equipped or the spark plug itself is causing your Legacy to throw P Ignition Coil B indicates the problem is in cylinder two. Different manufacturers use different methods. There is a really easy test to determine if it is the primary or secondary wiring that has thrown this code in your Legacy.
Move the ignition components coil pack, plug wire, plug from cylinder B to another, and clear the codes.
We go into this in greater detail below go straight there. The first place that you would want to start looking for what could be causing P in your Legacy would be the wiring harness. You can use a digital voltmeter to check if the coil pack is getting the proper signal. Although, it could also be a bad plug or plug wire as well. A great way to determine if it is an ignition related component, and not a wiring issue, is to reset the trouble code and swap the coil, plug, and plug wire if equipped with another cylinder.
If the misfire did move cylinders, you can go ahead and replace the plug, plug wire, and coil pack.
Subaru Legacy P0352 Ignition Coil “B” Primary/Secondary Circuit → Malfunction
If you are on a tight budget, you can keep resetting the code and swap the ignition parts back one at a time until the misfire returns to cylinder two. Start with the coil pack. Take a look at where the harness plugs into the coil pack. If so it may need to be replaced. If the misfire is intermittent, go ahead and jiggle the wiring harness and see if it has an impact on the way the engine is running.
Look anywhere that the harness bends or touches anything sharp. Look to see if it looks burnt anywhere.Variety of subaru wiring diagram. A wiring diagram is a streamlined standard photographic representation of an electric circuit. It shows the parts of the circuit as simplified forms, and also the power and signal links in between the gadgets. A wiring diagram typically gives info about the family member position and also arrangement of tools and also terminals on the tools, to assist in structure or servicing the tool.
A pictorial diagram would reveal extra information of the physical appearance, whereas a wiring diagram uses a more symbolic notation to emphasize interconnections over physical look. A wiring diagram is often utilized to repair problems as well as to earn certain that all the links have been made as well as that whatever exists. Collection of subaru wiring diagram.
Click on the image to enlarge, and then save it to your computer by right clicking on the image. Architectural circuitry diagrams reveal the approximate areas and interconnections of receptacles, lights, and also permanent electric solutions in a structure.
Adjoining cable paths might be revealed about, where certain receptacles or fixtures must be on a typical circuit. Wiring representations utilize standard signs for electrical wiring gadgets, generally different from those made use of on schematic diagrams. The electric signs not just reveal where something is to be mounted, however additionally what sort of device is being mounted. A surface area ceiling light is revealed by one sign, a recessed ceiling light has a various icon, as well as a surface area fluorescent light has one more sign.
Each type of button has a various sign therefore do the numerous electrical outlets. There are signs that reveal the area of smoke detectors, the buzzer chime, as well as thermostat. On large tasks icons may be phoned number to show, for instance, the panel board as well as circuit to which the device connects, as well as to determine which of numerous types of fixture are to be set up at that place. A collection of electrical wiring layouts might be required by the electric examination authority to accept connection of the house to the public electric supply system.
Electrical wiring diagrams will likewise include panel routines for breaker panelboards, and also riser diagrams for special solutions such as emergency alarm or closed circuit television or various other unique solutions.By jrettenmayerSeptember 15, in Subaru Retrofitting. Anyone have copies of the EJ22 wiring schematics for a Legacy? I'm working on pulling the wiring harness, and the schematics in the EJ writeup are quite helpful, but still missing a lot - I'm trying to label and figure out what's what so I don't miss anything.
Also - if you need any parts off a 90 Legacy, let me know. You rock! Not trying to sound like an idiot here - I read through the conversion write-up - but where does the EJ22 harness get spliced into the EA82 harness?
I'm starting to feel like I bit off more than I can chew Strip the EJ harness down to just engine-control stuff, and then splice those wires in wherever you can grab them. Thanks for all your help so far! I need to get the harness pulled out completely I think before I can really make any sense of this!
I need the ignition and fuel pump relays, and the VSS, temp, and oil pressure wires. Its probably easier than I'm making it out to be, but whoa! I'm so confused Is it necessary to get the freshly machined flywheel, or can I make due with the old flywheel just grinding out the holes to match the EJ flywheel? Will putting a new clutch on the old flywheel surface be problematic in the long run? Looks good Chux, you are great at these write-ups! Can't wait to get mine going.
Is there a list of the "engine control stuff" anywhere? And also a handful of wires coming in from the middle of the firewall it looks like the cam angle sensor enters there - and some other stuff I've not dissected out yet - anyone know what a "dropping resistor" is and do I need to keep it? Basically, what needs to be kept beyond the wiring that obviously goes to the engine? Wires to splice into the gauges? Part of my troubles here are that I don't yet have real good diagrams to go off of I have a Haynes manual.
Numchux's digrams have been real helpful, but I can't tell if they are incomplete or I'm just dumb You need to be a member in order to leave a comment. Sign up for a new account in our community.
It's easy! Already have an account? Sign in here. Subaru Retrofitting Search In. Recommended Posts. Posted September 15, Maybe a write-up exists that details the wiring a little more in-depth? Share this post Link to post Share on other sites. Posted September 16, This is the page I send out with the harnesses that I do. Posted September 17, Subaru Legacy owners have reported 7 problems related to ignition under the electrical system category. The most recently reported issues are listed below.
Also please check out the statistics and reliability analysis of Subaru Legacy based on all problems reported for the Legacy. When starting the vehicle on cool morning and occasional afternoons, it doesn't start. The radio, gauges function but the engine doesn't engage. There is a clicking sound and a partial turning of the engine. After attempts, vehicle starts and functions normally. The vehicle was examined by the local service center when problem first occurred, but was unable to repeat it.
Contacted manufacturer who contacted local service center and center offered to repeat exam. Currently, vehicle in service center's possession but problem has not reoccurred for them. Unable to diagnose vehicle problem. This is an annoying situation when one has to rely on private auto for transportation to school and work. See all problems of the Subaru Legacy. Request for reimbursement regarding the repair of the Subaru Legacy driver's side front spring.
During a routine inspection, it was discovered that the spring on the left front of the consumers vehicle had failed for the second time.
Subaru Legacy: Key Stuck in Ignition → Diagnosis
When the original spring failed the first time, it caused damaged to the tire and the spare tire. The ignition wire were worn, the headlight bulb was replaced.
Electrical short, when driving vehicle completely lost of power, had to pull off highway and restart. The vehicle will shut off at speeds of 30 to 35 mph for no apparent reason. Since everything is powered the brakes and steering no longer operate and the car cannot get off the road. Car Problems. Ignition problem of the Subaru Legacy 1. Ignition problem of the Subaru Legacy 2.
Ignition problem of the Subaru Legacy 3. Ignition problem of the Subaru Legacy 4. Ignition problem of the Subaru Legacy 5. Ignition problem of the Subaru Legacy 6.
Ignition problem of the Subaru Legacy 7. Electrical System problems. Wiring problems. Ignition Module problems. Car Will Not Start problems. Battery problems. Fuses And Circuit Breaker problems. Battery Dead problems. O2 Sensor problems.Problems with your Forester Ignition Coil can cause serious issues with your 2. Some of these Subaru Forester problems can range from intermittent engine misfire issues or your Forester not starting.
This coil pack is mounted to the top of your engine, and failure of these coils are relatively common. If you have misfire make sure that you check your crank and cam angle sensors before continuing onto your Subaru coil pack.
When your Forester has an issue with the coilpack, chances are the check engine light will lit up. While you are testing your Forester ignition coil you should also inspect your spark plugs and spark plug wires.
If you see any issues with these components, replace them right away. Because this ignition coil pack is mounted to the top of your boxer engine failure is fairly common. Exposed to the heat and vibration in your engine bay, this procedure can help you test the coil packs.
First open your hood and locate the coil pack. Unplug your Forester ignition coil pack. You do this at the four wire connector at the face of your coil packs. You should have 0. The next step of this DIY guide is to measure resistance at the spark plug wire terminals. Crank your multimeter down a notch and probe at the pairs shown to measure secondary resistance. The resistance at these spark plug coil pairs should read Remove the four bolts that hold this coil pack in place, and install your replacement coil pack.
Leave us a message below and let us know! My Subaru misfire condition wont go away even after Ive completed thus How to guide. What else can it be? Please help! If you have a misfire in your Subaru, have your tried load balancing your EJ engine by unplugging your spark plugs one at a time? So I was excited when I first read this article, as I thought I had diagnosed my forester sudden no start and no spark on coil side 1 and 2.
I am no electrical expert, but when I tested pins c and d my meter did something funny, vs the readings on pin a and b. So i purchased a new coil. I think C pin is power in?
I have not installed the new coil as I might loose return option.