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no communication with TCM, 2005 XJ-8

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Old 06-20-2023, 10:49 PM
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Default no communication with TCM, 2005 XJ-8
Is there a separate power supply to the TCM? I have no communication to it thru my scanner? Thanks!
Also show p1642.
2005 xj-8l V-8 4.2 l
 
Last edited by mrlakeview; 06-21-2023 at 09:06 AM.
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Old 06-22-2023, 11:17 PM
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Originally Posted by mrlakeview
Is there a separate power supply to the TCM? I have no communication to it thru my scanner? Thanks!
Also show p1642.
2005 xj-8l V-8 4.2 l
What scanner are you using?
 
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Old 06-23-2023, 08:58 AM
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Autel 708 ! It has always worked?
 
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Old 06-26-2023, 07:57 AM
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As always - check that your voltage is around 12.6 or better at the OBD port.
 
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Old 07-31-2023, 01:45 PM
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Got around to retesting everything, (after I brought it to a specialist who told me the TCM was NG) found the ground behind the right front headlight had corroded! Repaired the ground and rechecked, no ign power to terminal #9 in the TCM connector. Traced to the interior fuse panel,#33, Replaced the fuse an presto!
 
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Old 07-31-2023, 03:07 PM
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I like happy endings!
 
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Old 08-01-2023, 05:22 PM
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Originally Posted by mrlakeview
Got around to retesting everything, (after I brought it to a specialist who told me the TCM was NG) found the ground behind the right front headlight had corroded! Repaired the ground and rechecked, no ign power to terminal #9 in the TCM connector. Traced to the interior fuse panel,#33, Replaced the fuse an presto!
Magnificent!!
 
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Old 08-03-2023, 05:41 PM
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Originally Posted by abonano
What scanner are you using?
Remember I had that issue years back. Not sure if it was the problem but a bad wire ended up being revealed leading to my transmission that would blow the fuse dealing with my ECU/TCM. It cause my car to be dead in the water. One lil wire
 
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