Pinpoint Test Ad: U0146:00

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
IPMB U0146:00	Lost Communication With Serial Data Gateway "A": No Sub Type Information	Sets in continuous memory in the IPMB if data messages received from the GWM are missing for 5 seconds or longer.

Possible Sources

Communication concern
GWM
IPMB

AD1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to AD2

No	CLEAR the DTC. The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AD2 CHECK THE COMMUNICATION NETWORK
- Using a diagnostic scan tool, perform the network test.
Does the GWM pass the network test?

Yes GO to AD3

No REFER to: Communications Network .

AD3 PERFORM THE IPMB (IMAGE PROCESSING MODULE B) SELF-TEST
- Using a diagnostic scan tool, check the IPMB Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Are any Diagnostic Trouble Codes (DTCs) present?

Yes REFER to Diagnostic Trouble Code (DTC) Chart .

No GO to AD4

AD4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the GWM self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to: Communications Network .

No GO to AD5

AD5 RECHECK THE IPMB (IMAGE PROCESSING MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the IPMB Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, perform the continuous memory self-test.

Check the IPMB Diagnostic Trouble Codes (DTCs).

Is DTC U0146:00 present?

Yes

GO to AD6

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic, or an intermittent fault condition.

AD6 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI, or the PMI may not have been carried out.

CHECK the vehicle service history for recent service actions related to the GWM or IPMB. If recent service history is found:
- verify correct replacement module was installed
  - vehicle parts build may be used to verify correct part fitment
- verify the configuration of replacement module was correct
  - re-configure module using as-built data if prior configuration is suspect
- verify the module was not obtained from a like vehicle and installed into customer vehicle
  - return the swapped module to source vehicle and obtain new replacement module
  - if a new replacement module is installed, PERFORM PMI using as-built data

Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?

Yes

GO to AD7

No	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

AD7 CHECK FOR CORRECT GWM (GATEWAY MODULE A) OPERATION

Ignition OFF.

Disconnect and inspect the GWM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the GWM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new GWM. REFER to: Gateway Module A (GWM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.