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Home >> Hyundai >> 2007 >> Elantra SE, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System (G4GC-GSL 2.0) >> DTC Troubleshooting Procedures >> DTC U0101 Serial Communication Problem With TCU (Timeout) >> Component Inspection
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Component Inspection

  1. Ignition "OFF"
  2. Measure resistance between terminals 77 and 78 of the ECM connector (ECM side)

    Specification : Approx. 110~130Ω

    Fig 1: Measuring Resistance Between Terminals 77 And 78 Of ECM Harness Connector
    G05363920
  3. Is resistance within the specification?

    YES 

    • Go to next step as below.

    NO 

    • Check ECM for contamination, deterioration, or damage. Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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