Chrysler PT Cruiser 2001 Service Manual Supplement page 2703

Symptom List:
PCM STATUS FAILURE
SERIAL LINK EXTERNAL FAULT
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be PCM STATUS FAILURE.
When Monitored and Set Condition:
PCM STATUS FAILURE
When Monitored: With the ignition ON.
Set Condition: This condition exists when a PCM STATUS message was not received
from the PCM for at least 20.0 seconds.
SERIAL LINK EXTERNAL FAULT
When Monitored: At ignition ON, after ignition ON during any rolling code handshake
that occurs with the PCM due to a SKIM reset or a PCM reset, or during 'Secret Key'
transfers to the PCM.
Set Condition: This condition is set when the SKIM does not receive an expected bus
message transmission acknowledgment from the PCM after 3 transmit attempts.
INTERMITTENT WIRING HARNESS PROBLEM
WIRING HARNESS INSPECTION
SKIM/PCM
TEST
1 Note: Ensure the PCM has proper powers and grounds before continuing.
Using the DRB III, read and record SKIM DTC's then erase SKIM DTC's.
Turn the ignition off.
Wait 2 minutes.
Turn the ignition on.
Using the DRB, read the codes.
Does the DRB display the code that was previously erased?
Yes → Go To 2
→ Go To 4
No
VEHICLE THEFT/SECURITY
POSSIBLE CAUSES
ACTION
243
APPLICABILITY
All