P1901
Read the instructions below then
start the fault diagnostic procedure.
Symptom: No bus communication with DICE.
No Bus Data From DICE. See Fault Tracing 3:5 Bus and Diagnostic Communication.
Fault symptoms
No bus communication with DICE.
Condition
The following conditions are applicable:
Trionic:
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•
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No communication for 10 seconds
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Diagnostic help
Some of the following symptoms can
perhaps
be observed:
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Diagnostic trouble code P1921 or P1902 in the TCM.
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Additional diagnostic trouble codes in the Trionic (P1902, P1923 or P1908).
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Radiator fan runs continuously or not at all (coolant may boil).
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Direction indicators do not work.
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Interior lighting does not work.
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Intermittent wiper operation does not work.
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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.
