P1923
Read the instructions below then
start the fault diagnostic procedure.
Symptom: No bus communication with TCM
No Bus Data From TCM. See Fault Tracing 3:5 Bus and Diagnostic Communication.
Fault symptoms
No bus communication with TCM
Condition
The following conditions are applicable:
Trionic:
|
•
|
The TCM has been present on the bus at some time previously
|
|
•
|
No communication for 3 seconds.
|
Diagnostic help
Some of the following symptoms can
perhaps
be observed:
|
-
|
Diagnostic trouble code P1921 or P1902 in TCM (if the TCM can be contacted)
|
|
-
|
Additional diagnostic trouble codes in the Trionic (P1901, P1902 or P1908).
|
|
-
|
Automatic transmission in Limp-Home mode (CHECK ENGINE lamp on).
|
Checking the wiring harness
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.
