ACM No Left SIACM Messages (Stored)

Test 1:

SYMPTOM
ACM, NO LEFT SIACM MESSAGE - STORED

TEST NOTE
This symptom is diagnosed using the test ACM, INTERROGATE LEFT SIACM - STORED.


WHEN MONITORED
With ignition on, the ACM monitors the PCI Bus for the Left SIACM status message. The Left SIACM transmits the status message to the ACM at 1 second intervals.

SET CONDITION
If the ACM fails to see the Left SIACM status message on the PCI Bus for 5 seconds the code will set.

POSSIBLE CAUSES
- Checking for active left SIACM DTCS
- Stored code present