P1908

Read the instructions below then start the fault diagnostic procedure.

Symptom: No bus communication with MIU.

P1908

Fault symptoms

No bus communication with MIU.

Condition

The following conditions are applicable:

Trionic:

•	Engine has started

•	No communication for 3 seconds.

Diagnostic help

Some of the following symptoms can perhaps be observed:

-	Additional diagnostic trouble codes in the TCM (P1902 or P1923).

-	Additional diagnostic trouble codes in the Trionic (P1901, P1902 or P1923).

-	Engine fails to start.

-	Cruise Control does not work.

-	A/C not working.

-	Radiator fan runs continuously.

-	Main instrument unit's instruments and lighting not working.

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.