strange sound testing fuses?.......
#41
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The fuel injector feature is great !!...just back probe all 8 injectors with a t pin...takes 2 minutes !!
#43
Ok, removed wheel, removed panel, was shocked at the condition of the ECU and 3 connectors, they were really bad, covered in sand/grit, connectors really difficult to remove with the crude, nearly a whole can of contact cleaner on getting them off and cleaning the pins and plugs.
Ok now down to the serious stuff, i want to start testing with the scope at the ECU end as you have suggested Rob, but iv never back probed an ECU and can't see how i can get to the wires as they are pretty much completely covered by the plastic casing.
I know you do it by wire piercing probe but i dont have one at the moment but do have the normal back probe pins, any idea's how i can get to where i can back probe?
Also would i need to put the connector back on the CRK sensor for testing? and same for the injector tests, does the CRK need to be plugged in?
i'm guessing it does as the ECU needs to see Cam and Crank signals to fire spark and deliver fuel, not sure on that though.
And because getting parts for me takes about 2 weeks from the States, iv just gone ahead and ordered Cam and Crank sensors to cover all bases, even if one doesnt need to be changed at least i have it ready for when its needed.
Ok now down to the serious stuff, i want to start testing with the scope at the ECU end as you have suggested Rob, but iv never back probed an ECU and can't see how i can get to the wires as they are pretty much completely covered by the plastic casing.
I know you do it by wire piercing probe but i dont have one at the moment but do have the normal back probe pins, any idea's how i can get to where i can back probe?
Also would i need to put the connector back on the CRK sensor for testing? and same for the injector tests, does the CRK need to be plugged in?
i'm guessing it does as the ECU needs to see Cam and Crank signals to fire spark and deliver fuel, not sure on that though.
And because getting parts for me takes about 2 weeks from the States, iv just gone ahead and ordered Cam and Crank sensors to cover all bases, even if one doesnt need to be changed at least i have it ready for when its needed.
#44
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Hi !!...yes, it needs to be plugged back in !!...watch this video from the 12 minute mark...Ivan is very sharp I don’t know why he was going after the cam sensor from the back of the engine !!..,well anyway there Is a plastic cover that fits over the end of each row of pins...there are release tabs at each corner...do you see them ??...I pinch each end and remove each cover....see if you can see where the wire goes in and if you can back probe it....i don’t remember if there is space to push a to push a thin pin in.... plug the crank sensor in and check injector pulse !!...I’m off work today so let me know and I’ll get to mine to look !! ...in the video you can see those plastic covers I’m talking about !!!
Last edited by C5 Diag; 09-24-2018 at 07:48 AM.
#45
Ok, will do, i will plug CRK sensor connector back in, and check injectors and watch video's for todays tasks.
Great info.
Many thanks, have a great day. i'll get back to you later on results.
Great info.
Many thanks, have a great day. i'll get back to you later on results.
#46
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...pinch together or small screwdriver to pop them off...let me know about the back probing and I'll get to my PCM !!
#47
Ok today's tests....
Connected crank sensor back in, connected ECU connectors back, (BTW my connectors at the ECU are totally different to yours, i've attached a photo to show you, very difficult to get to pins)
So i've ordered a piercing probe from Amazon, it will be here tomorrow afternoon.
So today, used test light and checked all injectors and they all have ignition 1 voltage, and they light at KOEO and they all pulse (although quite slowly, i expected quite a fast pulse)
So all looks good on injector side of things i think? (I made a video of the pulse so you can tell me if it's normal for cranking) i have put a link to dropbox with the video
https://www.dropbox.com/s/96vn1bla2n...pulse.mp4?dl=0
Fully enclosed, very difficult to get to pins
Connected crank sensor back in, connected ECU connectors back, (BTW my connectors at the ECU are totally different to yours, i've attached a photo to show you, very difficult to get to pins)
So i've ordered a piercing probe from Amazon, it will be here tomorrow afternoon.
So today, used test light and checked all injectors and they all have ignition 1 voltage, and they light at KOEO and they all pulse (although quite slowly, i expected quite a fast pulse)
So all looks good on injector side of things i think? (I made a video of the pulse so you can tell me if it's normal for cranking) i have put a link to dropbox with the video
https://www.dropbox.com/s/96vn1bla2n...pulse.mp4?dl=0
Fully enclosed, very difficult to get to pins
#48
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Ok today's tests....
Connected crank sensor back in, connected ECU connectors back, (BTW my connectors at the ECU are totally different to yours, i've attached a photo to show you, very difficult to get to pins)
So i've ordered a piercing probe from Amazon, it will be here tomorrow afternoon.
So today, used test light and checked all injectors and they all have ignition 1 voltage, and they light at KOEO and they all pulse (although quite slowly, i expected quite a fast pulse)
So all looks good on injector side of things i think? (I made a video of the pulse so you can tell me if it's normal for cranking) i have put a link to dropbox with the video
https://www.dropbox.com/s/96vn1bla2n...pulse.mp4?dl=0
Fully enclosed, very difficult to get to pins
Connected crank sensor back in, connected ECU connectors back, (BTW my connectors at the ECU are totally different to yours, i've attached a photo to show you, very difficult to get to pins)
So i've ordered a piercing probe from Amazon, it will be here tomorrow afternoon.
So today, used test light and checked all injectors and they all have ignition 1 voltage, and they light at KOEO and they all pulse (although quite slowly, i expected quite a fast pulse)
So all looks good on injector side of things i think? (I made a video of the pulse so you can tell me if it's normal for cranking) i have put a link to dropbox with the video
https://www.dropbox.com/s/96vn1bla2n...pulse.mp4?dl=0
Fully enclosed, very difficult to get to pins
Last edited by C5 Diag; 09-24-2018 at 12:54 PM.
#49
Yes your right i think we are looking at ignition side of things rather than fuel.
Yes the injectors and coils run from the same respective fuses, i.e fuse ODD INJ does one bank of injectors and coils and fuse EVEN INJ does the other bank.
Both fuses are tested good.
I also checked for 12v on the main 8 way coil harness which feeds all coils similar to your second photo...that also checks out and the grounds as well.
so tomorrow i need to check the ground at the back of motor.
I checked no spark with a spark tester similar to a test light, but designed just for testing spark.
Yes the injectors and coils run from the same respective fuses, i.e fuse ODD INJ does one bank of injectors and coils and fuse EVEN INJ does the other bank.
Both fuses are tested good.
I also checked for 12v on the main 8 way coil harness which feeds all coils similar to your second photo...that also checks out and the grounds as well.
so tomorrow i need to check the ground at the back of motor.
I checked no spark with a spark tester similar to a test light, but designed just for testing spark.
#50
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Yes your right i think we are looking at ignition side of things rather than fuel.
Yes the injectors and coils run from the same respective fuses, i.e fuse ODD INJ does one bank of injectors and coils and fuse EVEN INJ does the other bank.
Both fuses are tested good.
I also checked for 12v on the main 8 way coil harness which feeds all coils similar to your second photo...that also checks out and the grounds as well.
so tomorrow i need to check the ground at the back of motor.
I checked no spark with a spark tester similar to a test light, but designed just for testing spark.
Yes the injectors and coils run from the same respective fuses, i.e fuse ODD INJ does one bank of injectors and coils and fuse EVEN INJ does the other bank.
Both fuses are tested good.
I also checked for 12v on the main 8 way coil harness which feeds all coils similar to your second photo...that also checks out and the grounds as well.
so tomorrow i need to check the ground at the back of motor.
I checked no spark with a spark tester similar to a test light, but designed just for testing spark.
#51
I just need to find pin 62 dark blue/white at the ECU with a piercing probe and test with the scope for crank signal. as you can see from the pics above its going to be difficult to find the right wire to tap into.
#52
i will double check that ground wire for all coils tomorrow, iv checked it with the probe and it gives me a ground signal but i want to back it up with a DVOM for GOOD ground.
I'll also check that its the black to black/white as well.
Also we dont know that we are getting a GOOD crank signal as yet, i havent got to test that side until i find that wire at ECU to scope
I'll also check that its the black to black/white as well.
Also we dont know that we are getting a GOOD crank signal as yet, i havent got to test that side until i find that wire at ECU to scope
Last edited by mazzerman; 09-24-2018 at 01:38 PM.
#53
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Usually the ECU/PCM pin outs are numbered...mine is C1 and C2 and numbered from like 1-72 or something...the end numbers might be on the side of the PCM !!
#54
I know which connector the CRK wire is in and also the pin number and the numbers are on the ECU but the problem is that the connector would have to come off to count the pins to find pin 62, but then the problem is that because of the big plastic casing its in, you cant actually see the wire exiting on the other side to know which one it is, the only time the wires become visible is when the exit the rear of the connector about 2 inches away from pin and when they exit they are just bundled tightly together with a cable tie.
So what i will have to do is cut the sealing tape back so i can open up the bundle a bit more and then hopefully just find ONE dark blue/White wire, then i know thats the one. if there are more than one dark blue/white wires then i'm gonna struggle.
So what i will have to do is cut the sealing tape back so i can open up the bundle a bit more and then hopefully just find ONE dark blue/White wire, then i know thats the one. if there are more than one dark blue/white wires then i'm gonna struggle.
#55
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I know which connector the CRK wire is in and also the pin number and the numbers are on the ECU but the problem is that the connector would have to come off to count the pins to find pin 62, but then the problem is that because of the big plastic casing its in, you cant actually see the wire exiting on the other side to know which one it is, the only time the wires become visible is when the exit the rear of the connector about 2 inches away from pin and when they exit they are just bundled tightly together with a cable tie.
So what i will have to do is cut the sealing tape back so i can open up the bundle a bit more and then hopefully just find ONE dark blue/White wire, then i know thats the one. if there are more than one dark blue/white wires then i'm gonna struggle.
So what i will have to do is cut the sealing tape back so i can open up the bundle a bit more and then hopefully just find ONE dark blue/White wire, then i know thats the one. if there are more than one dark blue/white wires then i'm gonna struggle.
#56
Yep, just checked the wiring diag for my car and its exactly the same as yours dark blue/white is both crank and #8 injector control.
What OHM setting would you use and what reading should i expect OL?
What OHM setting would you use and what reading should i expect OL?
Last edited by mazzerman; 09-24-2018 at 02:56 PM.
#57
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If I use my DVOM I usually leave it on 20K...no, OL (open loop) is a resistance (infinite) that is more than the DVOM is capable of measuring. At 20K mine will go from "1" to "0" if there is continuity !!...If using my Vantage Pro it is auto ranging and I don't have to change anything !!
#59
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