SPONSORED LINKS

Codes 159, 542 and 543, engine will not stay running?

Tiny
WAYEN1
  • MEMBER
  • 1994 FORD RANGER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 176,000 MILES
My truck will start run great for 30 to 45 seconds then stops, like the key was turned off. I got codes 159, 542 and 543. Nothing seems to help it run like it used to. The codes were KOEO test. I checked fuel pressure it’s within specs
Saturday, August 19th, 2023 AT 11:50 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,632 POSTS
It sounds like the PCM is going out but to be sure here is a guide to help check the wiring and the PCM wiring diagrams below:

https://www.2carpros.com/articles/how-to-check-wiring

Code 159: Continuous Memory Test Failed

Code 542: Fuel Pump Secondary Circuit Failure

Code 543: Fuel Pump Secondary Circuit (Lack Of) Voltage

Here is the location and how to replace the PCM in case you need it. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, August 20th, 2023 AT 11:37 AM

Please login or register to post a reply.

Related Engine Stall While Driving Content

How to Read Codes
VIDEO
How to Read Codes
Instructional repair video
Engine Stalls While Driving
GUIDE
Engine Stalls While Driving
An engine that stalls while driving and then starts back up again, either immediately or after a short time is different from an engine that just wont start or if the...
VIEW MORE

Sponsored links