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Transmission replaced three times, but vehicle drives slowly on forward and reverse?

Tiny
MALLYBOY
  • MEMBER
  • 2014 NISSAN SENTRA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 45,678 MILES
Fault codes:

P0890-TCM POWER RELAY SENSE CIRCUIT LOW,
P0744-TORQUE CONVERTER CLUTCH INTERMITTENT,
P0603:ECM KEEP ALIVE MEMORY(BACK UP CIRCUIT),
U0100:LOST COMMUNICATION WITH ECM/PCM A,
P0868:FLUID PRESSURE LOW

How do I troubleshoot these and where's TCM relay located?
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Monday, July 31st, 2023 AT 12:42 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Here is the transmission wiring diagrams and there is no TCM control relay. I would think the problem is with the TCM itself, did you check the power ground and fuses?

This guide can help:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Please let us know what happens.
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Tuesday, August 1st, 2023 AT 10:50 AM
Tiny
MALLYBOY
  • MEMBER
  • 309 POSTS
Please send me fuse box diagram complete, so that I can locate the TCM power relay sense circuit.
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Wednesday, August 2nd, 2023 AT 2:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
I don't see a TCM power relay? Here are the fuse panels. Check out the images (below). Please let us know how it goes.
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Thursday, August 3rd, 2023 AT 10:13 AM

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