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Home >> Hyundai >> 2004 >> Tiburon Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System (2.0L) >> DTC Troubleshooting Procedures >> DTC P1602: Serial Communication Problem With TCM (Time Out) >> Inspection Procedures
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Inspection Procedures

  1. CHECK ECM AND TCM CONNECTORS
    1. Thoroughly check the connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

    Are all connectors good? 

    Yes: Go to next

    No: Repair or replace it.

  2. CHECK FOR OPEN IN HARNESS
    1. Turn ignition switch to OFF position and disconnect the ECM and TCM connectors.
    2. Measure the resistance between terminal 7 of the ECM harness connector and 3 of the TCM harness connector.
    3. Measure the resistance between terminal 6 of the ECM harness connector and 4 of the TCM harness connector.
    Fig 1: Measuring Resistance Between Terminals Of ECM Harness Connector & TCM Harness Connector
    G00883577Courtesy of HYUNDAI MOTOR CO.
    • Specification: below 1ohm 

    Does each resistance indicate continuity? 

    Yes: Go to next

    No: Repair open in harness.

  3. CHECK FOR SHORT TO GROUND IN HARNESS
    1. Keep the ECM and TCM connectors disconnected.
    2. Measure the resistance between terminal 7 of the ECM harness connector and chassis ground.
    3. Measure the resistance between terminal 6 of the ECM harness connector and chassis ground.
    Fig 2: Measuring Resistance Between Terminal Of ECM Harness Connector & Chassis Ground
    G00883578Courtesy of HYUNDAI MOTOR CO.
    • Specification: infinite 

    Does each resistance indicate open? 

    Yes: Go to next

    No: Repair short to chassis ground in harness.

  4. CHECK FOR SHORT IN HARNESS
    1. Keep the ECM and TCM connectors disconnected.
    2. Measure the resistance between terminals 6 and 7 of the ECM harness connector.
    Fig 3: Measuring Resistance Between Terminals 6 & 7 Of ECM Harness Connector
    G00883579Courtesy of HYUNDAI MOTOR CO.
    • Specification: infinite 

    Does resistance indicate open circuit? 

    Yes: Go to next

    No: Repair short in harness.

  5. CHECK FOR SHORT TO POWER IN HARNESS
    1. Keep the ECM and TCM connectors disconnected.
    2. Turn ignition switch to ON position.
    3. Measure the voltage between terminal 7 of the ECM harness connector and chassis ground.
    4. Measure the voltage between terminal 6 of the ECM harness connector and chassis ground.
    Fig 4: Measuring Voltage Between Terminal Of ECM Harness Connector & Chassis Ground
    G00883580Courtesy of HYUNDAI MOTOR CO.
    • Specification: below 0.5V 

    Is voltage within specifications? 

    Yes: Check the fault code related to the TCM and proceed with the ECM PROBLEM PROCEDURE  .

    No: Repair short to power in harness.

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