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post #31 of 46 Old 08-19-2017, 12:27 PM Thread Starter
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Re: Question about Pm











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post #32 of 46 Old 08-19-2017, 12:36 PM Thread Starter
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Re: Question about Pm

Injector control for injectors 1/2 are on the VT/YL wire in Cavity #2 of the Red Connector.
Injector control for injectors 3/4 are on the GY/WT wire in Cavity #3 of the Red Connector.

What voltage or ohm should i get testing this ?
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post #33 of 46 Old 08-19-2017, 01:08 PM
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Re: Question about Pm

You shouldn't get any voltage. The ECU switches the ground side of the circuit.

You can check continuity from the injector harness to the PM, that should be very low.
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post #34 of 46 Old 08-19-2017, 01:17 PM Thread Starter
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Re: Question about Pm

I probed them wires on the red connecter VT/YL wire in Cavity #2 and GY/WT wire in Cavity #1.
I got a voltage reading of 5.02 volt from both when the ignition was on and 0.00 when off.
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post #35 of 46 Old 08-19-2017, 01:32 PM
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Re: Question about Pm

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Originally Posted by mrchuck View Post
I probed them wires on the red connecter VT/YL wire in Cavity #2 and GY/WT Cavity #1.
I got a voltage reading of 5.02 from both when the ignition was on and 0.00 when off.
If you probed the wires, then yeah, you will get some voltage. Because you are going through the injectors to ground. I don't know what the actual voltage should be.

But you should only get that for a split second when you turn on the key. The ASD relay will fire to prime the fuel system, which also powers the injectors and coil for a second, then it shuts off until the ECU senses the engine cranking via the HEP in the distributor. If you are getting 5V all the time, there is another issue.
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post #36 of 46 Old 08-19-2017, 01:51 PM Thread Starter
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Re: Question about Pm

I when out and probed the connecters that connect to the injectors 3/4 and i did not get a reading with or without the key on.I just changed out the Pm i got a referbed one.
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post #37 of 46 Old 08-21-2017, 10:44 AM
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Re: Question about Pm

You need either a logic probe or noid lights to see if the injector is being pulsed.

When the ASD relay is actuated power should be a constant 12 volts at all four injectors, that never changes.
You can manually actuate the ASD relay and see if power is present and constant to all four injectors.
Once you verify that is correct, remove your manual jumper from the ASD relay, then check that power is still present at all four injectors when cranking the engine.

Using a noid light will eliminate having to do all of this.
You can rent them at Autozone.
OEM 8 pcs. noid light set 27161 - Read Reviews on OEM #27161

Unplug the injector connector and insert the noid light, crank the engine, one of three things will happen...
1)Does not light at all
2)Lights but does not flash on/off
3)Lights and flashes on/off

If power is present in all of the above situations then you know that the issue is with ground side control which could be either the LM, PM or any of the wiring/connectors in between.

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post #38 of 46 Old 08-21-2017, 12:49 PM Thread Starter
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Re: Question about Pm

The ASD relay is part of my Pm or is it external ?
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post #39 of 46 Old 08-21-2017, 06:09 PM Thread Starter
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Re: Question about Pm

Ok i rented the OEM 8 pcs. noid light set,tested the first one and second one ( injectors for cylinder 1&2) and got pulses from them.I then tested 3&4 and got nothing,no pulse,light or anything from them.I already replaced the PM.
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post #40 of 46 Old 08-21-2017, 09:26 PM
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Re: Question about Pm

If the Noid Light did not illuminatethen we know you have no power going to injectors 3 and 4.

Since you have power at injectors 1 and 2 we know you do not have an ASD issue, you have a wiring issue to injectors 3 and 4.
That wiring issue could be anywhere from the injector harness to the PM, you are going to have to check the circuit starting at the injector harness.

Start by testing power at the injector harness connector. (Circuit Z1)
1)If you have power at the injector harness connector (both sides) then you know your issue is in the injector harness.
2)If you have power going into the connector but not coming out the issue is with the connector terminals.
3)If you have no power into the injector harness connector then you have to check the circuit from the PM 10 Pin Connector Cavity #6 to the Injector Harness Connector.
4)Be aware...
If you have no continuity as listed above that means the wire is broken somewhere in the harness (probably at a splice) and it will require opening the harness to find it or just tapping into the ASD output wire and running new wires to the injector harness connector.
You have a couple of options to do this...
1)Check each section of the harness with an ohmmeter for continuity.
2)Manually actuate the ASD relay and check for power at the injector harness for injectors 3 and 4.

It does not matter where your ASD is located, either in the PM (85-87) or externally mounted (88 - up), you manually actuate it the same way up to 1990.
1)Locate the Diagnostic Connector
(I think it is on the R/S (passenger) on an 85)
2)Using a jumper wire ground the DB/YL wire in the diagnostic connector.
3)Turn the key to the "on" position.
4)The ASD will be actuated, the fuel pump will run and power will be present at the + coil and the fuel injectors on the DG/BK wires.

Question about Pm-85-87-pm-10-pin.jpg

Question about Pm-electrical-diagnostic-connector.jpg

Question about Pm-6-asd-manual-actuation.jpg

Question about Pm-img_new.jpg

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post #41 of 46 Old 08-23-2017, 11:15 AM Thread Starter
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Re: Question about Pm

Quote:
Originally Posted by NAJ View Post
If the Noid Light did not illuminatethen we know you have no power going to injectors 3 and 4.

Since you have power at injectors 1 and 2 we know you do not have an ASD issue, you have a wiring issue to injectors 3 and 4.
That wiring issue could be anywhere from the injector harness to the PM, you are going to have to check the circuit starting at the injector harness.

Start by testing power at the injector harness connector. (Circuit Z1)
1)If you have power at the injector harness connector (both sides) then you know your issue is in the injector harness.
2)If you have power going into the connector but not coming out the issue is with the connector terminals.
3)If you have no power into the injector harness connector then you have to check the circuit from the PM 10 Pin Connector Cavity #6 to the Injector Harness Connector.
4)Be aware...
If you have no continuity as listed above that means the wire is broken somewhere in the harness (probably at a splice) and it will require opening the harness to find it or just tapping into the ASD output wire and running new wires to the injector harness connector.
You have a couple of options to do this...
1)Check each section of the harness with an ohmmeter for continuity.
2)Manually actuate the ASD relay and check for power at the injector harness for injectors 3 and 4.

It does not matter where your ASD is located, either in the PM (85-87) or externally mounted (88 - up), you manually actuate it the same way up to 1990.
1)Locate the Diagnostic Connector
(I think it is on the R/S (passenger) on an 85)
2)Using a jumper wire ground the DB/YL wire in the diagnostic connector.
3)Turn the key to the "on" position.
4)The ASD will be actuated, the fuel pump will run and power will be present at the + coil and the fuel injectors on the DG/BK wires.

Attachment 234658

Attachment 234666

Attachment 234674

Attachment 234682


I tested power at the injector harness connector.I get power there but there different readings.The white wire gave a a reading of 0.86 and the tan one gave a reading of 0.16,I went ahead and tested the green/Db wire in cavity #6 of the PM and that gave me a reading of 11.97
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post #42 of 46 Old 08-23-2017, 11:57 AM Thread Starter
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Re: Question about Pm

I was taking a closer look at the PM connector and noticed that the wires coming out of the connector were exposed and the tan one that runs to the injectors 3/4 looks broke.I would post a pic but photo bucket is not posting pic`s right anymore.
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post #43 of 46 Old 08-23-2017, 07:07 PM Thread Starter
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Re: Question about Pm

I think i might of figured it out.........I took the connector and where the tan wire went i drilled thru it enough to fit the tan wire thru,stripped the coating off and pushed it around the brass fitting in the Pm connector,hooked everything back up,turned the key and it fired right up,so now i guess im looking for a Pm 10 pin connector.
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post #44 of 46 Old 08-23-2017, 07:10 PM Thread Starter
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Re: Question about Pm

thank you all that replied to give me a idea of where & what to look for.
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post #45 of 46 Old 08-23-2017, 07:24 PM
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Re: Question about Pm

Quote:
Originally Posted by mrchuck View Post
I think i might of figured it out.........I took the connector and where the tan wire went i drilled thru it enough to fit the tan wire thru,stripped the coating off and pushed it around the brass fitting in the Pm connector,hooked everything back up,turned the key and it fired right up,so now i guess im looking for a Pm 10 pin connector.
I feel pretty sure that I have one available with a few inches of wire on it. PM me if interested. I will sell you just the connector Vs the entire front engine harness.
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