2007 Commander XK Factory Service Manual 5 - BRAKES

U0101-LOST COMMUNICATION WITH TCM

For a complete wiring diagram Refer to Section 8W.

When Monitored:

With the ignition on
Battery voltage between 10 and 16 volts
IOD fuse installed
FCM is configured correctly

Set Condition:
Bus messages not received from the TCM for approximately 500ms.

Possible Causes

CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED

DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES

FCM NOT CONFIGURED CORRECTLY

TCM POWER AND GROUND

MODULE THAT SET THIS DTC

Diagnostic Test

1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Is this DTC active?

Yes

Go To 2

No

Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
Perform BODY VERIFICATION TEST – VER 1.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read all active DTCs from all modules.

NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms.
Perform BODY VERIFICATION TEST – VER 1.

No

Go To 3

3. VERIFY THAT THE TCM IS ACTIVE ON THE BUS

Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the TCM is active on the bus.

Is the TCM active on the bus?

Yes

Go To 4

No

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No Response diagnostic procedures.
Perform BODY VERIFICATION TEST – VER 1.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs “Logged Against” the TCM?

Yes

Replace/update the TCM in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1.

No

Replace/update the module that set this DTC in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1.