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98 mustang 3.8l no power to inertia switch

Changed CCRM and PCM all fuses good no voltage at inertia switch

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Posted on Jan 02, 2017

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SOURCE: 1999 ford taurus with fuel issues checked the

At this point I would get a haynes manual from somewhere like autozone so you can get the wiring schematic. I believe the relay is turned on by the computer. It sounds like there is a wiring issue between the relay and the inertia switch. Have you checked the harness long the frame for damage or plugs in the engine bay.

Posted on Jan 02, 2010

  • 67 Answers

SOURCE: Is the pcm and the ccrm on a 2000 mustang the same

the answer is no they are not the same. the constant control relay module or integrated control module is located on the right inner fender well under the hood. it has a 24 pin connector going to it and it controls various things like the cooling fans and the air conditioning system.

Posted on Jul 08, 2010

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SOURCE: 98 Ford Ranger 2.5 liter

Iwould check the fuel pump next for 12 volts . If you have it there then you need to look at the fuel pressure regulator. The way this works is one side hooks to engine manifold vacuum and the other is pressure from the fuel pump and supplys the injectors no electrical involved but if the diafram goes or leaks you would get less or no fuel to the injectors . Its kind of hard to say for sure with out seeing it but it sounds like a no fuel issue it could be the pump so you need to investigate some more to find out if it is electrical or fuel related good luck with it

Posted on Mar 09, 2011

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SOURCE: 1997 ford thunderbird 4.6l

Hi, have you checked the fuel pump relay? It is turned on by the PCM. You can try swapping it with a similar relay in the box under the hood. If that doesn't work, probe the relay socket with a 12 volt test light to see what's going on. With the key off, there should be one hot terminal in the relay socket. With the key on, there should be 2 hot terminals and one ground terminal. To find the ground terminal, hook the test light clip to battery positive and probe the socket. A grounded terminal will light the light brightly. The pump terminal should light the light dimly. The 2 hot terminals should not light the light at all. Please let me know if you have questions, and thanks for using FixYa.


Posted on Mar 14, 2011

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SOURCE: 2000 ford mustang 3.8 no power at fuel pump fuse is good relay is good it does have a anti theft device, inertia is good

You have a fuel pu,p driver module that gets the power from the inertia switch and the power for the fuel pump comes from that module. I would start by checking for a wiring problem. Below is a picture of where that module is located. At the plug of the module you want to make sure you have good continuity from the pink and black wire at the module to the inertia switch. Then you will want to make sure you have continuity from the fuel pump to the module in the brown and pink wire. That should be the power source to the fuel pump. One other thing to keep in mind and that is the PCM controls ground to the fuel pump so this may be an issue. Try that first to see if you have a wiring problem. If you have power from the inertia to the module but no power coming out of it to the fuel pump this may be your problem. Hope I was able to help...


Posted on Feb 29, 2012

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I have replace CCRM both AC switches fuse is good. I can run a by pass and compressor engages. I went as far as resetting the PCM still no 12 volts

I guess you have a ford? I need year--make--model?
Maybe you blew a fuse?
Click on the link.
Did you use a test light to check voltage at fuse? One is hot all the time, the other goes hot with the key on.

Jun 04, 2017 | AC Cars & Trucks

1 Answer

99 Mustang Fuel Pump Wont Come On After Replacing Fuel Pump, CCRM, Crankshaft Position Sensor

Click on the link for wiring diagram. I can help with testing, but, your going to have to do the testing. With test light check for voltage on the fuse circuits in diagram. It's always a good idea to check voltage and grounds.
Are there any applicable trouble codes? To check codes, at the least, you need an obd 2 code reader that will check manufacturer specific codes as well as p0 codes.
You also have an inertia switch.

Mar 29, 2017 | Ford Mustang Cars & Trucks

3 Answers

New fuel pump, ccrm and fuel filter and still blowing 20 amp fuel pump fuse

If the components are all good, then check wiring connectors and wiring circuits, it appears the problem is after the ccrm. wiring from ccrm to fuel pump. For testing you should be able to use jumper wire with inline 20 amp fuse, from voltage to fuel pump connector, to see if it will run w/o blowing the fuse. As you can see from ccrm to inertia switch there are two connectors. From inertia switch to fuel pump, one connector. There are many ways to test. With connectors unplugged, you could use a test lite connected to battery voltage, touch correct wire terminal, if lite comes on, that circuit is going to ground, somewhere.
See that one wire that goes down, wire circuit from ccrm to inertia switch, that wire goes to pcm, I believe it to a monitor circuit, the pcm monitors the voltage on that circuit.
fuel pump mustang-cnoq2pfwcs5zpwrvfs0kgho1-3-0.jpg

Aug 01, 2017 | Cars & Trucks

1 Answer

Open circuit to fuel pump

There is a 30 amp fuse in the underwood fuse block that is for the PCM/FUEL PUMP. It feeds power to the ccrm (constant control module relay). If there is no power to the inertia switch that is the first thing I would look at. It is the part located under the upper radiator support ne'er the battery.

Jan 20, 2012 | 1994 Ford Taurus

2 Answers

94 taurus, new fuel pump and pcm fan fuel module. car will not start and not getting gas to front. if we put a jumper on wire's at pump car starts and runs great

In the front passenger side corner of the engine compartment is a black box called the CCRM. Your fuel pump relay is inside this box. There is a 30 amp fuse somewhere near the box on a yellow wire that goes to the box. Check the yellow wire at the CCRM connector for power. If no power, find the fuse and replace it. If it burns again, check the wiring at the inertia switch--I had a customer last week that had a short at the inertia switch that was blowing the fuse. If the fuse is good and there is power to the CCRM, try jumping the pump from the battery positive to the CCRM connector pink wire/black stripe. If this turns the pump on, replace the CCRM. If this doesn't turn on the pump, check the inertia switch and wiring to the pump, including the ground wire. Please let me know if you have questions, and thanks for using FixYa.


Aug 14, 2011 | 1993 Ford Taurus

3 Answers

What would cause my 96 gt to crank but not start?? i get no fuel pressure under the hood nor do i get 12 volts to the pump, i have changed the fuel pump and the CCRM (the box inside the right front fender)...

This sounds like a fuel pump relay.Since it cranks,that means everything input to the PCM is good.These are start relay,start solenoid,starter,ignition switch and brake safety switch.The direct output are the fuel pump relay and a relay called an auto shut down relay,which is directly activated by the fuel pump relay to power the coil and injectors.Since the 2 relays are obviously the cheapest,take a reading at both.Some makers do not have a shut down relay but I think those are mainly Chevy.The CCRM,I am not sure what that stands for.As for the battery charger,I would need to know a little more about the situation.If you drained your battery trying to start your car but wouldn't,they are not likely related.As for the fuel pump,I wish you would have researched a little more because I know it is expensive and a pain in the a** to change.Relays go bad more often although 2 years I changed my pump on my 1995 Ford Escort.Wht I'm trying to get t is to try starting with cheaper fixes first,then you won't feel so bad if it doesn't fix. :( Just a suggestion but I have been doing repairs for years and have a system worked out due to experience.Relays are the most common fail items too,as well as switches,bulbs,and many other components but if you notice,most of these items are relatively cheap.If you have any questions or need more help,just comment here and I will get an autolink to your post and reply ASAP.Good luck,Greg

If you have any questions or need more help,just comment here and I will get an autolink to your post and reply ASAP.I really encourage responses so I can follow up properly as I know where you stand as asking someone else restarts all the explaining because we cannot see other 'Expert's' responses.Good luck,Greg

Dec 29, 2010 | 1996 Ford Mustang

1 Answer

My 1998 ford mustang 3.8 had a failure of the ground wire at the battery. I installed a new end and tried to start the engine. The engine cranks but would not start. I parked it in this spot overnight so I...

You sure the ground wires all reconnected? Check for power at the inertia switch. If it has power,the pump may be bad. Power to the Inertia switch comes through the FP relay, from the fuse. The relay is in a box called the CCRM (constant control relay module) Power from the relay to the switch is Dark Green/ Yellow wire.lF that wire has no power in the crank mode, then I think the CCRM is bad. The CCRM is located behind the coolant reservoir on a bracket. The ground for the CCRM is right front of engine compartment G103, dont really have a picture to tell you where exactly to look. Thanks for the detailed story, a lot of people write " it wont run, whats wrong"

Nov 22, 2010 | 1998 Ford Mustang

1 Answer

Fuel pump not firing.

there is a fuel pump relay also

Sep 27, 2009 | 1995 Ford Taurus

2 Answers

Fuel sysytem

there is a reset switch in the trunk on the right side under the carpet or in the trunk on the back wall by the tail lights i had same problem found it and it was the fix i have the same car 89 5.0 trunk style hope this helps

Jan 11, 2009 | 1989 Ford Mustang

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