Question about 1988 Ford F 150

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WHAT IS EEC - 1988 Ford F 150

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Electronic Engine Controller

Posted on Mar 21, 2011


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96 windstar eec wiring scematic


Find another relay with an identical part number(maybe the fuel pump relay)& swap it in place of the suspect EEC relay.See if the buzzing quits.If it does,the EEC relay is bad.There might be a ac WOT cutout relay or fan relay with an identical part number that you can use instead of the fuel pump relay.The fuel pump relay & EEC relay will both have to be in place in order for the engine to start.A relay should click when you turn the key on,but it shouldn't make a buzzing noise.BTW-the EEC relay is energized when you turn the key on and then it supplies ignition on power to the computer,injectors,solenoids and fuel pump relay.Therefore, if the EEC relay is defective, these components are Not going to work.If you don't hear the fuel pump prime when the key is first turned on,that's a sign the EEC relay is bad.One of the injector wires should have battery voltage, if the EEC relay is powering up.If your vehicle doesn't have a matching relay to the EEC relay(except for the fuel pump relay)just pull the FP relay out and slide it into place of the suspect EEC relay for testing purposes.If the buzzing noise stops,then replace the relay because there's no way to test if the car will start without having both relays in place.

Oct 11, 2015 | 1996 Ford Windstar

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Is the EEC-IV module the correct control module for my truck?


Yes, I'm pretty sure an '87 model would be EEC-IV. It was an emissions control system, not a module, and Ford went through the previous generations (EEC-I to EEC-III) during the early '80's with all types of barely-working contraptions.

Just look on the VECI label (Vehicle Emissions Control Information) under the hood. It will tell if it is EEC-IV. If your wiring diagram is for a 1987 model, then you are on the right track. It may be difficult to find an illustration of the ground points. Those are usually only in the Factory Service Manual. And neither Chilton nor Haynes will reproduce that portion of the wiring diagrams. Alldata probably would have it, but that is a subscription service.

Jul 06, 2015 | 1987 Ford Ranger

1 Answer

Firing order for 1982 351w in f150 truck


If it's a California truck it's a good chance the ignition is EEC-III (brown grommet on ignition module.)

The EEC-III distributor rotor fires alternately from both sides of the distributor rotor.

The the spark plug wires for an EEC-III distributor will be wired counter clock-wise in a different order.

351w firing order, CCW: 1-3-7-2-6-5-4-8
351w wire order, CCW: 1-5-7-8-6-3-4-2

Sep 01, 2014 | Ford F-150 Cars & Trucks

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Where is the ECU located on a 1992 ford explorer and what does it do?


What your Explorer has is actually called the EEC-IV. It is sort of like an ECU. The EEC stands for "Electronic Engine Controls". Your EEC-IV Does this:
  • Powertrain Control Module (PCM)
  • Throttle Position (TP) sensor
  • Mass Air Flow (MAF) sensor
  • Intake Air Temperature (IAT) sensor
  • Idle Air Control (IAC) valve
  • Engine Coolant Temperature (ECT) sensor
  • Heated Oxygen Sensor (HO2S)
  • Camshaft Position (CMP) sensor
  • Knock Sensor (KS)
  • Vehicle Speed Sensor (VSS)
  • Crankshaft Position (CKP) sensor

The EEC microcomputer circuit processes the input signals and produces output control signals to the fuel injectors to regulate fuel discharged to the injectors. It also adjusts ignition spark timing to provide the best balance between driveability and economy, and controls the IAC valve to maintain the proper idle speed.
The EEC is located in the engine compartment. Post your engine size and I can tell you where it's at.

Jul 22, 2013 | Cars & Trucks

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1999 lincoln the navigator no signal to injector and no have spark


Its possible that the EEC Relay is bad, the EEC diode or the signals are not processing in the EEC unit itself. Sometimes the Crankshaft signal is missing and it is suppose to tell the EEC module where the crankshaft is, so the correct Fuel injector opens and the correct spark plug fires.
Depending on the vehicle, your underhood powerbox may be marked with EEC and Diode. If you have an Owners Manual, look for the Relay box layout. Often the Horn Relay is the same part# as the other relays and can be used to test as a spare relay.
A scanner could diagnose the problem if you own one or could borrow one.

Jun 06, 2013 | 1999 Lincoln Navigator

1 Answer

No fire , spark or fuel


Is it a 4 cyl or V6 - and you are talking about the EEC relay right ?

Both the fuel pump relay and EEC relay are grounded by the computer. The fuel pump relay magnet is powered by the same red wire the injectors are powered by coming from the EEC relay.
The actual power circuits for each relay comes from different fuseable links.
You would need to find out if the relays are being grounded by the computer with the key on, and if they are sending power out.
You might also want to check to see if you get a check engine light when you turn the key on to see if the computer is powered up.

Oct 14, 2012 | 1988 Ford Ranger

1 Answer

Where is the eec relay on a 94 mustang


The EEC/PCM relay is behind the passenger side (RH) kick panel. It is the relay that powers the ECM, injectors, EEC controlled actuators. See picture below.
9_4_2012_4_04_52_pm.jpg

Sep 04, 2012 | 1994 Ford Mustang

1 Answer

What does check dcl mean


DCL is Data Communincations Link... the communication connection between the computers in the instrument cluster and the rest of the car. its usually caused (99% of the time) by a bad connection.

The Data Communications Link (DCL) is a wiring system that allows the sharing of information between the Electronic Engine Control System (EEC-IV) , the Electronic Instrument Cluster (EIC) and external equipment.

The EEC-IV system transmits the following information through the DCL to the EIC:
Engine RPM.
Engine coolant temperature.
EEC-IV malfunction indication.
Fuel used.

The DCL system transmits Malfunction Indicator Lamp (MIL) information to the EIC. The EIC uses MIL information to generate a CHECK ENGINE warning in the event of an engine sensor failure.

The EIC will display the message "CHECK DCL" on its Message Center Display if it is not receiving data from the EEC-IV. This warning is turned off whenever data communication is restored.

The EEC-IV monitors the Data Communication Link for faults. If a fault occurs in data communication a continuous Memory Code is set in the EEC-IV. The DCL Codes (529 for EEC-IV and 533 for EIC) can occur separately or together. These codes are not immediately cleared when data communication is restored.

The existance of a DCL code does NOT mean that a module has failed. also I would check for an oil leak or coolant leak that would be the cause of the smoking under the car.

Check this link for some help on fixing it: http://www.lincolnsonline.com/tech/00086.html

Hope helps.

Sep 11, 2011 | 1993 Lincoln Continental

1 Answer

Ford explorer eec relay


Try a new relay first. This may not be good news if that does not work. If you can find the EEC (computer) and unplug it, then replace the fuse-if it blows you have another cheaper part on the circuit thats bad.
If the fuse does not blow, then the EEC must be shorted.
If you have to replace the EEC you may find a kindly dealer with a cash-for-clunker sitting there to violate. Salvage yards have them, Ebay sells them. I have seen them at swap meets for $20. They are a high price part even rebuilt at Dealers or autoparts stores.

Aug 24, 2009 | 1991 Ford Explorer

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