Monday, July 25, 2011


Here is the fuse location (fuse 13) and also the constant control relay module location.The fuel pump relay is located in this module.

graphic





-------------------------

Here is the fuse location (fuse 13) and also the constant control relay module location.The fuel pump relay is located in this module.

graphic


-----------------


graphic


--------------


The relay is located in the engine compartment in a relay box. It is a long narrow black plastic box with removable lid, and sits next to the radiator overflow/fill reservoir.

------------------------

If your cooling fan is running(this is the default,if you disconnected the PCM and then turn the key to the run position the cooling fan will run) and your OBD2 scan tool is not linking up your PCM is not powering up.

When it is acting up check and see if you have power on the red wires on pin 71 and 97 at the PCM.This gets its power from the PCM relay on the ICRM(intergrated control relay module).

Here is a copy of the wiring schematic to help you.

graphic

Here is the connector at the PCM

graphic

graphic


-----------------


The relay control module is the one located on the radiator support that houses the relays for the PCM,Fuel Pump,AC,Cooling fans.

Here is a pic of the connector at the relay module.

graphic

Now how this works is looking at the wiring schematic I sent you the red/light wire on the right at pin 13 is the power feed for the coil side of the PCM relay,the black wire on pin 15 is the ground for the coil side of the relay. When power and ground are applied to the coil side of the relay,this creates a magnetic field which will pull the switch side of the relay closed.Looking at the left side of the schematic the switch side is the yellow wire on pin 8 and 10 which gets power from fuse 15L. when the switch is pulled closed power then can flow from the yellow wire to the red wire on pin 24 which feeds pins 71/97 of the PCM.

Now when it acts up if you have power at pins 71/97 then the problem is the PCM or one of the grounds to the PCM(look at the connector pic for which wires are ground).

If you do not have power to these 2 pins then your problem is either the wiring from the relay module to the PCM or the relay module itself.Most likely I would suspect the relay is sticking how ever a corroded wire or connection could also cause it.



The PCM is located behind the right kick panel. Here is a pic of the location

graphic



----------------------
OK NOW READ THIS SESSION AS FOLLOWS:----
THIS WILL GIVE YOU BETTER IDEA TO RESOLVE YOUR ISSUE:---

Yes, I've ordered a IRCM Intergated Relay Control Module yesterday, because I've been told by a Ford Mech. (retired) that these fail from the High Heat. It has been 95+ this last week, and I broke down and used my AC. Never use the AC much.

I reseated the gound cable from the Battery to the Radiator Support, removed and reseated the Connector on the IRCM that's mounted on the Rad. Sup. behind the Air Filter Box, reseated the Connectors by the ECM behind Pass. kick panel, Loosened ( didn't completley remove) the ECM Connector and retightened, reseated the Ground Cable that's next to the ECM. Replace the Relay in the Power Dist. Box for the Fuel Pump.

After all that the car started hard, and the Rad. Fan didn't run as it was before. I made it to work fine. At lunch it didn't run the fan, and wouldn't start, finely after several tries it started as normal. Started 4+ times after that during the hour. When I got ready to go home, it started hard, but did start. It was only 90 out that day.

Today went out to start it, 73 outside and cool. I turned on the ignition and heard the Rad. Fan runnning, Fuel Pump run for about 3 seconds. Cranks over never tried to fire.

On/ OFF the Key several times and still nothing.

QUESTION FOR TODAY: About the Grounds for the IRCM and the ECM. I know that the gounding of these items, especially the ECM are very important. Can you tell me how to check these and there LOCATIONS. Also can I use a 12V light probe to check the ECM for 12V? I do have a Fluke, light is easier.

To check the Voltages at the ECM, can I drop it down without causing any problem with ESD? Does it need to be grounded when I let it hang?






max