Computer gone amuck?????????
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Elder User
Joined: Oct 2003
Posts: 986
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From: Gulf Shores, AL
Computer gone amuck?????????
I will make this simple, I am getting code 998 during a KOER test, " Engine Control Sysyem operating in failure mode and Effects Management (FMEM) programming strategy" Has my puter kicked the bucket? The truck runs but it will idel up and down one time about every 2 min or so and I get an intermitent miss above 3000 rpm occasionally. Also the colder the outside air temp. the harder it is to start. Any ideas?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
Originally Posted by Fully_Loaded
I will make this simple, I am getting code 998 during a KOER test, " Engine Control Sysyem operating in failure mode and Effects Management (FMEM) programming strategy" Has my puter kicked the bucket? The truck runs but it will idel up and down one time about every 2 min or so and I get an intermitent miss above 3000 rpm occasionally. Also the colder the outside air temp. the harder it is to start. Any ideas?
-- Open or short in harnesses (internal/external).
-- Solenoid damaged electrically.
Key off.
Disconnect transmission vehicle harness connector.
Key on, engine off.
Measure the voltage between VPWR, EPC PWR circuit at transmission vehicle harness connector and chassis/battery ground.
Is voltage greater than 10.5 volts?
Thread Starter
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Elder User
Joined: Oct 2003
Posts: 986
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From: Gulf Shores, AL
What is the VPWR and EPC PWR circuit? So the test is at the tranny harness plug. The chassis/battery ground is a seperate test where I disconnect the negative and test from the negative terminal to the negative cable correct? I am not very good with the electrical end of testing. I appreciate the response.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I am sorry that I gave you the wrong information, the information I gave you was for a Code 998 KOEO.
VPWR: Vehicle Power.
EPC: Electronic Pressure Control.
A 998 KOER says:
Key On Engine Running:
Refer to these EEC-IV DTC Charts for direction to diagnose the Continuous DTC received during Key On Engine Off Self-Test.
And I can not seam to find the next step on:
Continuous DTC received during Key On Engine Off Self-Test.
I would check the Fuse or Fuse Link to your Keep Alive Power (Pin 1) of the EEC (PCM).
VPWR: Vehicle Power.
EPC: Electronic Pressure Control.
A 998 KOER says:
Key On Engine Running:
Refer to these EEC-IV DTC Charts for direction to diagnose the Continuous DTC received during Key On Engine Off Self-Test.
And I can not seam to find the next step on:
Continuous DTC received during Key On Engine Off Self-Test.
I would check the Fuse or Fuse Link to your Keep Alive Power (Pin 1) of the EEC (PCM).
