Missing Engine RPM Input

Test 1 - 3:

SYMPTOM
MISSING ENGINE RPM INPUT

WHEN MONITORED
Continuously with the ignition on.

SET CONDITION
When the Transfer Case Control Module stops receiving a bus message for Engine RPM for the period of 5 seconds.

POSSIBLE CAUSES
- Communication DTC's Present
- Transfer Case Control Module
- Intermittent Wiring And Connectors