Trucks missing BAD Code reader no help
Thread Starter
|
Mountain Pass
Joined: May 2011
Posts: 235
Likes: 1
From: Alamo, TN
Trucks missing BAD Code reader no help
Well the day before yesterday my truck started running like crap. It's like I've lost a cylinder or something. It's a 5.0 with mass air. I've got no check engine lights on. I hooked it up to my code reader and all it gives me is 000 doing a KOEO and the same thing when I do a KOER. But when I did the KOER it didn't do anything. When I ve done it in the past it has revved the motor while its doing its checks. This time nothing.
Do you think it's the ECU or something with the motor?
Do you think it's the ECU or something with the motor?
Thread Starter
|
Mountain Pass
Joined: May 2011
Posts: 235
Likes: 1
From: Alamo, TN
That did the trick. here's what I got
KOEO
121 closed throttle voltage higher or lower than expected
512 keep alive memory (KAM) test failure
111 system pass
KOER
121
172 hego (H02S) sensor fault/lean
536 brake on/off circuit not activated during KOER
538 insufficient rpm change during KOER dynamic response test
632 overdrive trans cancel switch / no action during self engine run test.
Any ideas on what I need to do?
KOEO
121 closed throttle voltage higher or lower than expected
512 keep alive memory (KAM) test failure
111 system pass
KOER
121
172 hego (H02S) sensor fault/lean
536 brake on/off circuit not activated during KOER
538 insufficient rpm change during KOER dynamic response test
632 overdrive trans cancel switch / no action during self engine run test.
Any ideas on what I need to do?
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
KAM Code might be from disconnecting the battery, or a possible electrical problem.
TPS code suggests that the throttle position isn't returning fully to closed, or you may have bumped the pedal a bit while checking the codes.
The O2 sensor code says you're lean. This can be from a dirty/bad MAF sensor, low fuel pressure, or a bad O2 sensor. I'd start by checking the fuel pressure.
The three other codes are because you didn't push the brake, blip the throttle and cycle the OD switch during the test.
TPS code suggests that the throttle position isn't returning fully to closed, or you may have bumped the pedal a bit while checking the codes.
The O2 sensor code says you're lean. This can be from a dirty/bad MAF sensor, low fuel pressure, or a bad O2 sensor. I'd start by checking the fuel pressure.
The three other codes are because you didn't push the brake, blip the throttle and cycle the OD switch during the test.
7th Gear
Joined: Mar 2014
Posts: 7
Likes: 0
throttle position sensor is a common wear item. Can cause all kinds of problems. mine would run fine until it warmed up. then wouldnt shift. thought it was transmission. Replaced throtte position sensor fixed it. I was getting throttle stuck wide open error. hope that helps.
Elder User
Joined: Jul 2011
Posts: 793
Likes: 2
From: Vernon, BC
The only input I have for you is to fix everything in the KOEO tests before trying to fix anything that shows up in the KOER tests. My manual that came with my code reader was very clear about that. Your code 121 sounds like a TPS sensor.
Check your wiring first to ensure you have clean and solid connections as the codes don't necessarily indicate a problem with a part. They are simply indicating the expected voltage for the test was not what it was supposed to be.
Good luck
Check your wiring first to ensure you have clean and solid connections as the codes don't necessarily indicate a problem with a part. They are simply indicating the expected voltage for the test was not what it was supposed to be.
Good luck
Thread Starter
|
Mountain Pass
Joined: May 2011
Posts: 235
Likes: 1
From: Alamo, TN
Is there one particular TPS that is better than the others. Advance has 3 listed for my truck.
BWD
Delphi
Wells
BWD
Delphi
Wells
Trending Topics
Thread Starter
|
Mountain Pass
Joined: May 2011
Posts: 235
Likes: 1
From: Alamo, TN
I've got low voltage reading on my TPS wiring. How do I tell if it's the connection or further down the wiring? do they sell pig tails for the female end?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Check the voltage at the TPS connector, should be around 1.00 volts at idle, and 4.5-5v wide open.
You can also test it down by the ECU, but it can sometimes be difficult to back probe the main eCU connector.
You can also test it down by the ECU, but it can sometimes be difficult to back probe the main eCU connector.
Thread Starter
|
Mountain Pass
Joined: May 2011
Posts: 235
Likes: 1
From: Alamo, TN
OK here's what I got with the key on but not running.
there's 3 pins in the connector. 1 pin gave me 4.98v and the other 2 were 0. do I need to do the check again with the motor running?
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
When you connect the new one you should be getting a voltage of 1.0 (could be lower like 0.8 or higher like 1.1) and when you move your throttle body to open it, the voltage should increase.
Thread Starter
|
Mountain Pass
Joined: May 2011
Posts: 235
Likes: 1
From: Alamo, TN
Like Lead Head said, the voltage should be low if you are not moving the throttle body (meaning it's closed). The way the TPS works is to increase voltage output as the throttle body is opened. If you are getting 4.98v and the throttle body is closed, I'd say replace it. Get one from your local parts store, these can be made cheaply and you will get what you pay for so don't get it off a place like eBay (I speak from experience).
When you connect the new one you should be getting a voltage of 1.0 (could be lower like 0.8 or higher like 1.1) and when you move your throttle body to open it, the voltage should increase.
When you connect the new one you should be getting a voltage of 1.0 (could be lower like 0.8 or higher like 1.1) and when you move your throttle body to open it, the voltage should increase.
The 4.98v come from the female side of the connector once ive disconnected the TPS. I'm a novice at best when it comes to any electronics on a truck.
am I testing it the correct way?
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
Basically the TPS sends a voltage back to the PCM to let the PCM know how far open (or closed) the throttle body is.
Thread
Thread Starter
Forum
Replies
Last Post
fkaster01
1987 - 1996 F150 & Larger F-Series Trucks
8
Apr 1, 2009 10:59 PM
nobodyspecial
1987 - 1996 F150 & Larger F-Series Trucks
18
Feb 3, 2007 10:05 AM
alcooner
1987 - 1996 F150 & Larger F-Series Trucks
5
Jul 15, 2005 08:45 PM
jroehl
1987 - 1996 F150 & Larger F-Series Trucks
7
Jun 17, 2005 07:13 PM