P1901
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Some of the following symptoms may be observed:
DTC P1921 or P1902 in TCM.
Further DTCs in Trionic (P1902, P1923 or P1908).
A/C malfunctioning.
Radiator fan running continuously or not at all (coolant may boil).
Radio not working.
Direction indicators not working.
Interior lighting not working.
Intermittent wiper not working.
No Bus Data From DICE. See Fault Tracing 3:5 Bus and Diagnostic Communication.
Fault symptoms
Some of the following symptoms may be observed:
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DTC P1921 or P1902 in TCM.
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Further DTCs in Trionic (P1902, P1923 or P1908).
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Radiator fan running continuously or not at all (coolant may boil).
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Direction indicators not working.
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Interior lighting not working.
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Intermittent wiper not working.
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Conditions
The following conditions apply for this DTC:
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Engine running and no communication for longer than 10 sec.
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Diagnostic help
Fault diagnosis concerns an intermittent electrical fault in the power supply to the transmitting control module or any of the bus leads.
Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.
