Pinpoint Test AP: U0121:87

AP1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify there is an observable symptom present.
Is an observable symptom present?
- Yes : GO to AP2
- No : The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
AP2 CHECK FOR ANY RECENT PMI (PROGRAMMABLE MODULE INSTALLATION) CHANGES
- Check the vehicle service history for recent service actions related to the IPC or the ABS module.
Have there been any recent service actions with either module?
- Yes : CARRY out a manual PMI on the applicable module using As-Built data.
- No : GO to AP3
AP3 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a diagnostic scan tool, perform a network test.
Does the ABS module pass the network test?
- Yes : GO to AP4
- No : REFER to: COMMUNICATIONS NETWORK .
AP4 PERFORM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST
- Using a diagnostic scan tool, perform the ABS module self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
- Yes : REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .
- No : GO to AP5
AP5 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
- Yes : For DTC U3006: 16, GO to PINPOINT TEST AW
  For DTC U3006:17, GO to PINPOINT TEST AX
  
  For all other Diagnostic Trouble Codes (DTCs), REFER to DTC CHART: IPC .
- No : GO to AP5
AP6 RECHECK THE IPC (INSTRUMENT PANEL CLUSTER) DIAGNOSTIC TROUBLE CODES (DTCS)
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.
- Clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Using a diagnostic scan tool, perform the IPC self-test.
Is DTC U0121:87 still present?
- Yes : GO to AP7
- No : GO to AP8
AP7 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect the ABS module 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 ABS module 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ABS module (part of the HCU ).
  REFER to: HYDRAULIC CONTROL UNIT (HCU) .
- 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.
AP8 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION
- Ignition OFF.
- Disconnect and inspect the IPC 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 IPC 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new IPC .
  REFER to: INSTRUMENT PANEL CLUSTER (IPC) .
- 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.