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Codes P0339, P1298 and P0141, long start and limp mode?

Tiny
ETON250
  • MEMBER
  • 2004 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 215,000 MILES
Turn the key fuel pump hums, PSI is above 40 crank delays and then runs. Replaced crank and cam sensors checked wires from sensors to ECM for brakes or corrosion nothing. Check and clean ground wires on engine and chase. Do get 3 codes P0339, P1298, P0141.
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Monday, May 22nd, 2023 AT 8:03 AM

14 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Here is what is said about the codes:

P0339 - Crankshaft Position Sensor "A" Circuit Intermittent:

P1298 - Electric Load Detector Circuit High Voltage:

P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2):

I would replace the crankshaft sensor and oxygen sensor and then clear the codes, also have the battery checked. Please let us know what happens.
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Monday, May 22nd, 2023 AT 3:15 PM
Tiny
ETON250
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Thank you.
I had replaced the crank sensor already and was very aware of it may be defective. I will replace it with an OEM and get back to you on it. Also, the 02 sensor as well, like to know how can I check my voltage regulator with removing it from the car? I own a voltage meter. It's crazy that the car still starts with a bad crank sensor.
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Monday, May 22nd, 2023 AT 5:00 PM
Tiny
KEN L
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If you replaced the crankshaft sensor again and it doesn't fix it, you could have a bad PCM. Please clear the codes after the repair and let me know.
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Tuesday, May 23rd, 2023 AT 11:33 AM
Tiny
ETON250
  • MEMBER
  • 8 POSTS
Replace the crank sensor and H2o sensor and now it starts soon but dies out on its own. The fuel pump is good, and PSI is above 40 when cranking. But I have to jump the relay. Checked for ignition power at relay and it's good but not getting the negative that the yellow/black wire needs? I moved relays around with ignition on and still the same. Jump relay = open the relay and push the tab towards the coil. Did send the ECM out and they found nothing wrong with it? If possible, to get the wiring diagram on the four relays behind the glove box?
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Tuesday, May 30th, 2023 AT 7:11 AM
Tiny
KEN L
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Does the engine still have the same codes, did you clear them? Also, here are the engine wiring diagrams so you can see how the system works.

This guide can help test the connections:

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

Check out the images (below). Please let us know what happens.
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Thursday, June 1st, 2023 AT 10:38 AM
Tiny
ETON250
  • MEMBER
  • 8 POSTS
Hello Ken L I would like to know if I can get the image you had share in a printable format. Thank you
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Tuesday, June 6th, 2023 AT 9:39 AM
Tiny
KEN L
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I would just print the images above which is the format we have access to.
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Wednesday, June 7th, 2023 AT 10:24 AM
Tiny
ETON250
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Okay, I will give it a shot on printing the images. Thank you
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Wednesday, June 7th, 2023 AT 10:57 AM
Tiny
KEN L
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Please let us know what you find.
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Friday, June 9th, 2023 AT 10:12 AM
Tiny
ETON250
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  • 8 POSTS
Hello Ken, thank you for the wiring diagram. I replaced the crank sensor and also checked for current at the fuel pump relay, now the fuel pump is not turning on when the ignition is turned on or cranking and came to notice that the wiring diagram you had shared does not match to what's on the car.
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Sunday, June 18th, 2023 AT 6:10 PM
Tiny
KEN L
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If the fuel pump turned on before by just turning the ignition key on. Then you may have a bad PCM. Let's do a CAN scan, you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

This should give us a better idea of the problem. Here is how to change the PCM out in case you get a code for it, you can get a preprogrammed unit by searching Google or Ebay.
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Monday, June 19th, 2023 AT 11:16 AM
Tiny
ETON250
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I had the fuel pump before I replaced the crank sensor. I had jumped the terminal inside the relay itself but then the car did start and ran but in limp mode and long crank cycles.
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Monday, June 19th, 2023 AT 12:12 PM
Tiny
ETON250
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Also, had sent the PCM out to get checked and they found nothing wrong with it. Again, the car started on its own but very long crank cycle and with a jumped fuel pump relay resolution was limp mode.
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Monday, June 19th, 2023 AT 12:17 PM
Tiny
KEN L
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You may have a throttle body that needs to be serviced or you have a vacuum leak. Also did any codes come up when you did the CAN scan?

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Please go over this guide and get back to us.
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Tuesday, June 20th, 2023 AT 3:20 PM

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