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Ecm wiring grounds - Cars & Trucks

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See the diagram attached. God bless you
ecm wiring grounds - 65190a59-e277-46dc-8992-5db4d6e8a718.jpg

Posted on Jul 27, 2013

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Injector stays open when it should be shut. We have a 08 Volvo 780 D12 . We have replaced the Egrs, injectors, cups, egr temp sensor. They rebooted the ECM. I'm thinking the Injector Wiring Harness.


The injector ground circuit has to be shorted to ground, only two things cause this, the wire to the injector from the ECM is damaged and grounded or the ECM injector driver circuit is shorted out.

Jul 01, 2016 | Volvo Cars & Trucks

1 Answer

4x4 4.0l V6. What are the probable causes of DTCs P0112, P0117, P0122, P0513, P0556, and P0565?


code p 0112 refers to intake air temp (IAT) sensor --circuit malfunction===cause --wiring short to graound--wiring short to positive --IAT sensor ---ECM
code p 0117 refers to engine coolant temp (ECT) sensor--circuit malfunction=== causes --coolant thermostat---wiring short to ground--wiring short to positive ---ECT sensor
code p 0122 refers to throttle position (TP) sensor A/ accelerator pedal position (APP) sensor A low input === causes wiring short to ground--TP/APP sensor --ECM
There are 3 responses to p 0122 and all refer to TP switch /sensor plus wiring open /short to ground/ short to positive
code p 0513 refers to incorrect immobilizer key=== causes immobilizer system
code p 0556 refers to brake booster pressure sensor---circuit range / performance=== causes --wiring---poor connection---brake booster pressure sensor---ECM
code p 0565 refers to cruise control master switch. off signal --malfunction === causes wiring---cruise control master switch--ECM
by reading all the codes you will see that common causes are wiring problems and ECM so may be a quick check would be to replace the ECM with a known working unit first and work back from there

Feb 23, 2016 | 1994 Ford Ranger Supercab

1 Answer

1992 c1500 5.7 Tbi no injector pulse while cranking


First check that you have power to the injectors with key in on. The injector fuse should be in the fuse/relay box under the hood. The red wire and the white wire are the power wires for each injector. The dark blue and dark green wires are the ground wires, respectively. The grounds both go into the ECM at the longer connector, where the computer grounds the wire internally to cause pulse.

If no power on either the red or white wire, check the fuse, and check it has power to it in run, or on. If both have power, you will probably need to trace the ground wires for a break. Or check continuity of the ground wires with an ohmmeter (a multi-meter), from injector connector to the pins at the ECM. If continuity is good, and no corrosion or problem with wire connectors, it could be a failed ECM.

Jul 08, 2015 | Cars & Trucks

1 Answer

On my 2001 Nissan Quest 3.3L #5 cilynder miss fire replace sparkplugs, wire, distributor, and injector still miss fire so I hook a noid light to it, it won't light up at all can it be the ECM and if you...


I don't know where it is, probably under the passenger side dash. But before condemning the ECM, check the wiring to that injector. First try to determine if it is the power wire or the ground wire for the injector which is lost. With key on, the yellow power wire should have voltage on it at the injector connector. This is independent of the ECM-only the ground wire goes into the ECM, to be internally grounded to pulse the injector. The #5 ground wire is a yellow-green wire.

If you have voltage on the power wire to #5, key on, then we know either the ground wire is bad (broken or open) to the ecm -or the internal ground for that injector is out, inside the ECM.

To determine whether it is the ground wire or the ECM, you will have to locate the ECM, pull the electrical connector off to it (Be sure and take the negative battery post off, first.), then locate the yellow green wire at pin #106 of the ECM electrical connector. Now test the continuity of that wire from the injector connector to the ECM connector-use a voltmeter set to ohms. If the wire has continuity, then the ECM must have a problem- the internal injector driver for #5 may have failed. Also look for a bent pin at #106, or anything amiss in the electrical connector. In most cases, it is not the ECM but a wiring problem.
Good luck. To locate the ECM, register for free at autozone.com, listing make, model, and year. Look under "repair guides", then component locations-it should tell you the location of the ECM.

Oct 04, 2014 | 2001 Nissan Quest

1 Answer

Mass air flow issue


Check for voltage at ecm conector pin #54 it should be a red wire. With the engine warm and idling you should have 0.9 - 1.8 dc volts then rev motor to 2500 rpms and you should have 1.9 - 2.3 dc volts. make sure you ground your multimeter to the bat or engine block. DO NOT ground to ecm or any ground wires that lead to the ecm.

Mar 22, 2012 | Cars & Trucks

1 Answer

My 1986 300zx non turbo injectors on pas side not working have power both wires and can ground signal wire and they will fire not getting ground signal could this be computer related


That wire from injector to ecm is the grounding side of the circuit. The computer grounds the circuit inside when it is time for the injector to open. Not sure but I think all three wires on pass. side splice into a single wire going to the ecm. Check the continuity of the wires from pass, side to ecm. Any corrosion on the ecm pins?
Am I understanding right that you have power to both banks of injectors, but only one side, or bank, is firing? If it's not a wiring problem, it could be the computer.

Nov 10, 2011 | 1986 Nissan 300ZX

1 Answer

I need a diagram for my ecm ground. its a 1992 gmc vandura G3500cargo. i am not getting a pulse to my injectors. also check engine light wont come on.


The ECM acts as the ground for the injectors. Sorry to say but your ECM is shorted out. The ECM is grounded threw the case connected to the body and or has several grounds in the wiring. But these grounds are not the problem, the problem is the quad drivers in the ECM.

Aug 23, 2011 | GMC G3500 Cars & Trucks

1 Answer

ECM not providing pulsed ground to TBI. used noid light to test (no light), tested for power (12 volts found). suspected possible ECM, purchased one at salvage yard and replaced (did not fix). checked...


Yes, correct. There is only the cam sensor in the distributor for the ecm's cam/crank reference signal. Many factors are figured in for pulse width, getting the air/fuel mixture correct.
Have you checked the ground for the ecm? The CEL does work? Too odd that both computers had no injector ground control, you must have missed something. Use an ohmmeter when you checked for continuity on the injector ground wire?

Jun 11, 2017 | 1994 Geo Metro

1 Answer

96 gand cherokee


Sounds like a body control module --in most newer cars there is a ecm for the elctronics for the motor and a bcm for all the interior dudadds --Check EVERY fuse in the truck and out under the hood -- look up the wire color codes for the ecm harness --check the power wire going to the ecm for 12v --or jump a wire off the batt + to that wire to feed it.try to locate all the grounds also--if need be google it --Like my ls1 trans am has a ton of ground wires --but there are 2 on the back of the head--if they are loose it will not run even tho all the other grounds under the hood are tight.I think they do that to isolate the ecm from ground back feeds or cross wireing when jump starting.

Jul 19, 2008 | 1996 Jeep Grand Cherokee

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