P1908
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Some of the following symptoms may perhaps be observed:
Engine fails to start.
Cruise Control does not work.
A/C not working.
Radiator fan runs continuously.
Main instrument unit gauges not working.
Additional trouble codes in Trionic (P1901).
Additional diagnostic trouble codes in the TCM (P1902 or P1923).
CHECK ENGINE
No Bus Data From MIU. See Fault Tracing 3:5 Bus and Diagnostic Communication.
Fault symptoms
Some of the following symptoms may perhaps be observed:
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Cruise Control does not work.
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Radiator fan runs continuously.
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Main instrument unit gauges not working.
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Additional trouble codes in Trionic (P1901).
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Additional diagnostic trouble codes in the TCM (P1902 or P1923).
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On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria:
Fault criteria:
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No communication for more than 3 s.
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Dependents:
System reaction to a fault:
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Cruise control is blocked.
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OK report:
Fault handling:
(See “Fault diagnosis, general” for more information.)
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Enable criteria fulfilled and fault criteria not fulfilled within 60 s.
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Diagnostic help
Fault diagnosis concerns intermittent electrical faults in the power supply for the sending control module or in a bus lead.
Check the wiring
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.
