Pinpoint Test BC : U023A
- NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.
Normal Operation and Fault Conditions
REFER to: Electric Powertrain Control - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition SOBDMC U023A:00 Lost Communication With Image Processing Module A: No Sub Type Information This DTC sets if data messages from the IPMA are missing. Possible Sources
- Communications network concern
- IPMA
- BC1 VERIFY THE CONCERN
- Ignition ON.
- Verify there is an observable symptom present.
Is an observable symptom present?
Yes GO to BC2 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. Using the scan tool, clear the Inverter System Controller (ISC) DTCs. - BC2 VERIFY THE DIAGNOSTIC SCAN TOOL COMMUNICATES WITH THE IPMA (IMAGE PROCESSING MODULE A)
- Connect the diagnostic scan tool to the vehicle.
- Attempt to establish a vehicle session using the diagnostic scan tool.
Can a vehicle session be established?
Yes GO to BC3 No REFER to: Communications Network . - BC3 CHECK FOR NON-NETWORK DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.
Are any non-network DTCs present?
Yes DIAGNOSE all non-network DTCs first. REFER to Diagnostic Trouble Code (DTC) Chart . No GO to BC4 - BC4 CHECK FOR NON-NETWORK IPMA (IMAGE PROCESSING MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the IPMA self-test.
Are any non-network DTCs present?
Yes REFER to Lane Keeping System . No GO to BC5 - BC5 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) AND IPMA (IMAGE PROCESSING MODULE A) CALIBRATION LEVELS
- Verify the Inverter System Controller (ISC) and the IPMA are at the latest calibration levels.
Are the Inverter System Controller (ISC) and the IPMA at the latest calibration levels?
Yes GO to BC6 No UPDATE the Inverter System Controller (ISC) or IPMA to the latest calibration level. - BC6 RECHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U023A
- Using the scan tool, clear the Inverter System Controller (ISC) DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, carry out the Inverter System Controller (ISC) self-test.
Is DTC U023A present?
Yes GO to BC7 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. - BC7 CHECK FOR OTHER CAUSES OF NETWORK COMMUNICATION CONCERN
- 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 IPMA and the Inverter System Controller (ISC). If recent service history is found:
- Verify correct replacement module was installed, vehicle parts build list 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 vehicle with concern, return the swapped module to source vehicle and obtain new replacement module.
- Operate the system and determine if the observable symptom is still present.
Is the observable symptom still present?
Yes GO to BC8 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. - BC8 CHECK FOR CORRECT IPMA (IMAGE PROCESSING MODULE A) OPERATION
- Ignition OFF.
- Disconnect and inspect all the IPMA 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 IPMA connectors. Make sure they seat and latch correctly.
- Ignition ON.
- 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, REFER to: Communications Network . 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.