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Home >> Hyundai >> 2003 >> Sonata LX, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.7L >> Diagnostic Tests >> DTC P1602: Serial Communication Problem With Transaxle Control Module (Time-Out) >> Test Procedure

Test Procedure

  1. Turn ignition OFF. Connect Hi-Scan Pro tool to DLC. See Figure . Turn ignition ON and monitor for DTCs. Verify DTC P1602 is set and go to next step.
  2. Turn ignition OFF. Disconnect ECM 40-pin harness connector C94-4. See Figure . Measure resistance between ground and ECM connector C94-4 terminal No. 36 (Orange/Black wire). Also measure resistance between ground and ECM connector C94-4 terminal No. 37 (Tan/Black wire). Both resistances should be infinite. If resistances are as specified, go to next step. If any resistance is not as specified, repair short to ground in Orange/Black wire or Tan/Black wire between TCM and ECM. After repair, go to step  5 .
  3. With ECM harness connector disconnected, measure resistance between ECM connector C94-4 terminals No. 36 (Orange/Black wire) and No. 37 (Tan/Black wire). Resistance should be infinite. If resistance are as specified, go to next step. If resistance is not as specified, repair short between Orange/Black wire and Tan/Black wire. After repair, go to step  5 .
  4. Leave ECM harness connector disconnected and disconnect TCM 22-pin harness connector C93-3. See Figure . Measure resistance between ECM connector C94-4 terminal No. 36 and TCM connector C93-3 terminal No. 3 (Orange/Black wire). Also measure resistance between ECM connector C94-4 terminal No. 37 and TCM connector C93-3 terminal No. 4 (Tan/Black wire). Both resistances should be one ohm or less. If resistances are as specified, go to next step. If any resistance is not as specified, proceed as follows:
    • Using Hi-Scan Pro tool, check if any DTC related to TCM is set.
    • If TCM related DTC is set. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
    • If no TCM related DTC is set, repair open or short circuit in Orange/Black wire or Tan/Black wire between TCM and ECM. After repair, go to next step.
  5. Return vehicle to original condition. Clear codes using Hi-Scan Pro tool. Verify repairs by driving vehicle and monitoring for pending codes. If DTC is set during test drive, follow appropriate DTC test procedure.
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