Fault Symptoms

No Bus Data From MIU:

Fault symptoms
No bus communication with the MIU.

Conditions
The following conditions are applicable:

Trionic:
- Engine has started
- No communication for 10 seconds.

Diagnostic help
Some of the following symptoms maybe observable:

- Additional diagnostic trouble codes in the TCM (P1923)
- Additional diagnostic trouble codes in Trionic (P1923)
- Engine will not start
- Cruise control not working
- A/C not working
- Radiator fan runs continuously
- MIU instrumentation and lighting not working







Check 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.