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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Information Center - Instrumentation, Message Center, & Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AW: DTC U0121 >> Pinpoint Test Aw: DTC U0121

Pinpoint Test Aw: DTC U0121

  1. AW1 VERIFY THE CUSTOMER CONCERN 
    • Ignition ON.
    • Verify that there is an observable symptom present.
    • Is an observable symptom present? 
    • Yes:  GO to AW2  .
    • No:  The system is operating normally at this time. The DTC may have been set due to high network traffic or intermittent fault condition.
  2. AW2 CHECK THE COMMUNICATION NETWORK 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Network Test.
    • Carry out the network test.
    • Does the ABS module pass the network test? 
  3. AW3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST 
    • Check for recorded IC DTCs from the self-test.
    • Is DTC B1317 or B1318 recorded? 
  4. AW4 RECHECK THE IC DTCs 
    NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.
    • Clear the DTCs. Repeat the IC self-test.
    • Is DTC U0121 still present? 
    • Yes:  INSTALL a new ABS module. REFER to VEHICLE DYNAMIC SYSTEMS . CLEAR the DTCs. REPEAT the IC self-test.

      If DTC U0121 is still present, INSTALL a new IC. REFER to INSTRUMENT CLUSTER (IC) . TEST the system for normal operation.

    • No:  The system is operating correctly at this time. The DTC may have been set due to high network traffic.
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