Pinpoint Test Ag : U0428: 00

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
IPMB U0428: 00	Invalid Data Received From Steering Angle Sensor Module: No Sub Type Information	Sets in continuous memory in the IPMB if data messages received from the SASM through the GWM are missing for 5 seconds or longer.

Possible Sources

Communication concern
SASM
IPMB

AG1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to AG2

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.

AG2 CHECK THE COMMUNICATION NETWORK
- Using a diagnostic scan tool, perform the network test.
Does the SASM pass the network test?

Yes GO to AG3

No REFER to: Communications Network .

AG3 PERFORM THE IPMB (IMAGE PROCESSING MODULE B) SELF-TEST
- Using a diagnostic scan tool, perform the SASM self-test.
Are any network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to DTC Chart: IPMB in this information. Refer to Diagnostic Trouble Code (DTC) Chart

No GO to AG4

AG4 PERFORM THE SASM (STEERING ANGLE SENSOR MODULE) SELF-TEST
- Using a diagnostic scan tool, perform the SASM self-test.
Are any network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to: Steering Wheel and Column Electrical Components .

No GO to AG5

AG5 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 U0428: 00 present?

Yes

GO to AG6

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.

AG6 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 SASM 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 AG7

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

AG7 CHECK FOR CORRECT SASM (STEERING ANGLE SENSOR MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the SASM 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 SASM 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 SASM. REFER to: Steering Column Control Module (SCCM) - Vehicles With: Adaptive Steering .

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.