Question about 1991 Ford F150

1 Answer

91 for d f-150 error code 998

Recently did an eec-iv test with 2 error code first code 126 which is my map sensor second code 998. I am waiting to get a new map sensor should be here by Saturday. But with code 998 where do I start to fix this

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 679 Answers


Error code 998 means .......Fault in ECT/ACT/MAF/TPR circuit.

follow the below link for more Information>>

please rate this solution.
Thanks for using FixYa.

Posted on Feb 13, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

1994 3.8 tbird No injector pulse, has fire and runs when spraying carb cleaner in intake

You need to run a quick test on the engine control computer. You may also just have a defective electric fuel pump inside the fuel tank.

This will reveal any fault codes that might be present. Follow the instructions at the link EEC IV Self Test Ford Fuel Injection and EEC IV Electronic Engine Control...

Dec 08, 2016 | 1994 Ford Thunderbird

1 Answer

I have a 1986 ford tempo GL 2.3L throttle body injection vin with a X my problem is when I make a right turn my car tries to stall and when I slow down to stop then it only goes 35 up steep hills

You need to check the fuel pressure and run an EEC-IV fault code tests both the running test and the passive key on engine off test. To run the fault code test using the check engine "blink" method go to the link below. The diagnostic connector is under the hood it is a red triangle shaped connector, it may have a cover on it that is black, it just pulls out of the cover.

EEC IV Self Test Ford Fuel Injection and EEC IV Electronic Engine Control...

Nov 17, 2016 | Ford Cars & Trucks

1 Answer

Ive got a 93 ford ranger.after it gets warm & u cut it off for about 5 mins,& start it back its like it floods

Ford Check Engine light Codes - FreeAutoMechanic
Full list of OBD I Diagnostic Trouble Codes for your Ford Vehicle. If your Check engine light is on you may have a serious problem. Scan your codes and follow ...

EEC-IV 2 and 3 digit trouble codes. - Ford Explorer and Ranger ... > ... > EEC IV
Feb 6, 2007 - Serious Explorations Ford Explorer and Ranger Message Board .... 3.8L AXOD - Message center data link circuit fault - See code 70 73 (O) Is FORD DEALER the only place who can read out ABS error ...
Dec 5, 2011
Error codes 186 & 539.
Aug 15, 2009
OBD-II Diagnostic Trouble Codes (DTCs)
Nov 8, 2008
Have a Code? OBD II Trouble Codes Here
Jan 19, 2006
More results from

EEC-IV Diagnostic Trouble Codes - Diagnose problems in

Dec 19, 2015 | 1988 Ford Ranger

1 Answer

89 tbird while driving, tach fails (goes to zero) and the automatic transmission begins bucking like it is going in and out of gear. Trans fluid level is find, suspect electrical issue under the hood. The...

You need to run a fault code test of the EEC4 (AKA OBD1) engine control system, this can be related to the ignition control module or the distributor pickup, both are a problem in this year, I have replaced hundreds of them. Use Ford OEM parts if the problem is the two parts I mentioned. To do a fault code test follow the link below. EEC IV Self Test Ford Fuel Injection and EEC IV Electronic Engine Control...

Jul 10, 2017 | 1989 Ford Thunderbird

1 Answer

Dies driving f150 1994

The engine in this year is controlled by a computer (called the ECM), the system is called the OBD1 electronic engine control system or EEC IV by Ford. Whenever you have a problem like yours the system will store a fault code in the memory of the computer, what you need to do now is have the OBD1 system tested for codes, you can do this using the Check engine light blink out code. Go HERE to learn to run a fault code test on the EEC IV system.

Jan 31, 2012 | Cars & Trucks

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:

Hope helps.

Sep 11, 2011 | 1993 Lincoln Continental

3 Answers

Check engine light comes on after approx. one minute. My code reader gives me a 214 in continuous memory ( cylinder ID circuit failure). I clear the code and it comes back. What is giving me this code?...

look 214 is not a valid code for a 1995 escort, this is an OBD1 system. here is a list of trouble codes for this year of ford no matter the model.

You should find the diagnostic connector under your hood normally by the fender on the battery side. By just using your test light and a jumper wire, it will tell you what kind of problem you got.

Model years 1984-1995 all models of Ford
1. Make sure engine is fully warmed. If in doubt, run engine at 2000 rpm for 2 minutes.
2. Turn ignition off and wait 10 seconds for system to shut off. Make sure A/C is off and transmission is in Park (automatic) or Neutral (manual).
3. Hook up light and jumper (or a tester if you have one). Turn key to ON (do not start engine). Read the codes.

How to do it?

Example code 23: your test light should flash 2 long consecutive flashes followed by 3 short pulses.

Ford's common codes for OBD1 (vehicles made before 1995)

11 system pass
12 idle control fault
13 dc motor did not move
14 engine rpm signal fault or PIP circuit failure
15 eec processor or power to KAM interrupted
16 rpm to low to check oxygen sensor test or fuel control error
17 cfi fuel control system fault or rich/lean condition indicated
18 ignition diagnostic monitor (IDM) circuit failure
19 cylinder identification (CID) sensor input failure
21 engine coolant temperature (ECT) out of self-test range
22 manifold absolute pressure (MAP) sensor circuit out of range
23 throttle positioner sensor out of self-test range
24 air charge temperature (ACT) sensor out of self-test range
25 knock not sensed during dynamic response test
26 transmission fluid temperature out of self-test range
28 loss of primary tach, right side
29 insufficient input from vehicle speed sensor
31 egr positioner sensor below minimum voltage
32 egr positioner sensor below closed limit
33 throttle positioner sensor noisy/harsh on line
34 egr valve circuit out of self-test range
35 egr valve circuit above maximum voltage
38 idle track switch circuit open
39 axod torque converter or bypass clutch not applying properly
41 oxygen sensor circuit indicates system always lean
42 oxygen sensor circuit indicates system always rich
43 oxygen sensor out of self-test range
44 air injection control system failure
45 coil 1 primary circuit failure
46 coil primary circuit failure
47 4X4 switch is closed or oxygen sensor failure
48 coil primary circuit failure
49 electronic transmission shift error
51 engine coolant temperature sensor circuit open
52 power steering pressure switch circuit open
53 throttle position circuit above maximum voltage
54 air charge temperature circuit open
55 key power input to processor open circuit
56 mass air flow circuit above maximum voltage
57 axod circuit failure
58 idle tracking switch circuit fault
59 automatic transmission shift error
61 engine coolant temperature circuit grounded
62 converter clutch error
63 throttle positioner circuit below minimum voltage
64 air charge temperature circuit grounded
65 charging system over voltage
66 mass air flow sensor circuit below minimum voltage
67 neutral/drive switch circuit open
68 transmission fluid temperature over temperature range
69 transmission shift error
70 data circuit communication link circuit failure
71 message center circuit circuit failure
72 insufficient manifold absolute pressure (MAP) change during dynamic response test
73 insufficient throttle positioner (TPS) change during dynamic response test
74 brake on/off (BOO) circuit open
75 brake on/off (BOO) circuit closed
76 insufficient air flow output change during test
77 brief wide open throttle not sensed during test
78 power interrupt detected
79 a/c on/defrost on during self test
81 map has not changed normally
82 super charger bypass circuit failure
83 OIC-low speed fuel pump relay circuit failure
84 egr vacuum regulator (EVR) circuit failure
85 canister purge circuit failure
86 shift solenoid circuit failure
87 fuel pump circuit failure
88 electro drive fan circuit failure
89 transmission solenoid circuit failure
91 no oxygen sensor switching detected
92 shift solenoid circuit failure
93 throttle positioner sensor input low
94 torque converter clutch solenoid circuit failure
95 fuel pump secondary circuit failure
96 fuel pump secondary circuit failure
97 transmission indicator circuit failure
98 electronic pressure control circuit failure
99 eec has not learned to control idle

Jan 14, 2010 | 1995 Ford Escort

Not finding what you are looking for?
1991 Ford F150 Logo

Related Topics:

1,243 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

78010 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

5651 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides