Coil and injector testing under Intake manifold
Hello people, I have recently finished my prototype for a special tool to perform testing of injectors and coils without the need to remove the intake manifold, please review the video and details of the tool and give me your input since I'll need that to show the tool companies I'm in contact with. the patent is on “pending” status, but the manufacturers will need your input for further consideration.
Intake Manifold Bypass Injector & Coil Test Unit
Idea, prototype designed and built by:
Enrique …, ASE master technician, Electronics technician, Owner of … mobile diagnostics and flash programming services.
Cell … e-mail …
Chula vista CA 91911 1/8/2022
Purpose of the Tool:
To allow the automotive technician the ability to perform signal testing from the ECM to Injectors and Coils, wiring integrity, injector and coils integrity and testing capabilities of such components on those vehicles that have some or all of the above mentioned components under the intake manifold, WITHOUT the need to remove the intake manifold and while the vehicle is running or in cranking mode.
The tool allows for a quick visual inspection of the component circuit operation via the integration of a bicolor LED for each injector and coil.
This tool is able to work for any number of 4 to 8 cylinder engines.
Test modes include the ability to open the circuit via an “ISOLATION” switch to effectively isolate the signal from the ECM and from the component’s harness allowing to simulate the removal of the connector for a more thorough test of the circuit. This is a very convenient test to isolate possible harness and PCM shorts to ground (or voltage) and open circuits and defective coils and injectors.
The user has the option to slide the switch to “PCM SIDE” or the “INJECTOR” or “COIL SIDE” effectively opening the circuit and giving the ability to “SEE” via the bi-color LED (and also at the test port with a multimeter or scope) either -and exclusively- the signal from the PCM -or- the circuit from the component without affecting each other. This is a very useful feature to find shorted pcm’s, harness or components issues and open circuits.
The test unit includes test probe jacks to permit the use of a scope directly at the tool for waveform analysis.
IMBICTUS includes test jacks for the signal tapping of the Crankshaft position and for Camshaft position sensor signal waveform analysis, this is very useful not only to verify signal integrity, but also for CRK/CAM synchronization waveform analysis and doing so easily without having to tap into the harness or gaining access to the sensors connectors for backprobing.
A built in injector pulser is included within the unit, which via an injector selector switch allows for engine off injector testing with a fixed 50 pulses @10ms output signal and therefore with the help of a fuel pressure gauge perform an injector balance test.
Additionally; the unit has current ramping loops to allow the current ramping test via a scope and low amp probe for both the injectors and coils.
“Single connector between harness & computer". Of the Breakout Boxes I used years ago they were system specific ie EEC IV etc. How is your universal harness bridging the harness & PCM?
Never mentioned a “universal harness”, sorry if it was implied that. It is however, just like a breakout box, system specific, you'll need a connector for each PCM type, SBEC, NGC, GPEC, GLOBAL etc.
WOW , a lot of time and planning went into that! Respectfully, here are my thoughts. If I were working on only one brand, this would be an awesome tool. I guess what I would like to know is, how many different connectors will I need if I am working on everything? That will be the determining factor on weather this is a hit or not. I guess the guys that test and rebuild pcms would be the ones…
Michael, I agree, availability and affordability of custom connectors will determine the target market. Is it possible there are some opportunities outside of the light duty segment?
Pretty cool tool but if I’m going to have to back probe at the pcm or an inlline connector anyway, why do I need it when I can just hook the scope up where I’m back probing? Or on some applications current ramp at the fuse box? Don’t get me wrong, I applaud the concept and the work put in, especially the kill switches, but for me it doesn‘t make diagnosis any faster and it’s another tool that i…
This was an idea that was tried decades ago, in the early nineties. The changing wiring looms doomed it to be very cost-ineffective. I worked on the prototype, from I believe it was Sun, which was being purchased by SnapOn. Very clumsy, and totally unnecessary, as were the BOBs of later years. We were (the shop I worked for way back then) involved in the field testing of the unit. An amp-ramp…
I believe the Snap On unit was called a “SimiTech”. I had an IBOB (intelligent break out box) made by MPSI that worked in conjunction with their scan tool to give pin data to the scan tool. I used it a few couple times on EEC IV Fords. Hooking up the cable, in series, was defiantly a chore especially when they hid ECM’s on older vehicles. Most older vehicles had minimal PID data so ECM / sensor…
That's it! I found it easier to just go to the circuit involved, rather than try to install the Simutech…
Hi Enrique. Clearly, a lot of time and work went into the creation of your tester, but did you do a need survey for market potential before spending the time and money? As Tim Alluded, back in the '90s there was a Sun project, but connection of the interface was so time consuming that it was completely impractical. At that time, ECMs were typically under the dash, so making connection was…
Enrique, That tool looks awesome. Would I buy one? Well that would depend on the cost/benefit calculation. If the upfront cost of the tool is high and then I need to buy an expensive harness for every car I want to test, then I would probably pass. There are ways to make connections and do voltage and current tests without pulling the intake. Granted, once your tool is connected, the ease of…
I feel like if you could get some manufacturers on board with that and they could jam it down dealers throats as an essential tool, you would do great.
Useful tool you made there, nice job. If you do revisions later you may want to consider using lamps instead of leds. I know lamps are not as flexible as leds but I have built quite a few testers for bench testing inj/coil outputs on pcms and I have run into problems before with LEDS showing good even when the drivers are failing. When using lamps on those same circuits, it will show the…
As I responded and several others as well, I don't really see what value the tool has when it's far easier to go to the circuits involved and check them with a scope, then finagle a very expensive set of connectors into place. Heck, by the time you've gotten your tool into place, I'd be almost done with the testing.
All my work is done on the bench out of the car, testing and simulating the circuits. I don't have much experience on your side of things trying to diagnose problems on the car so I cant speak too much on it but I could see where the tool could be useful for isolation. Its not a every job type of thing to me, looks more like a special occasion tool.