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Home >> Hyundai >> 1993 >> Scoupe Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 2121 - Turbo Boost - Control Valve Failure >> Harness Inspection

Harness Inspection

  1. Check circuit between ECM and control valve. Ensure ignition is off. Disconnect ECM connector. Connect jumper wire between ECM terminal No. 21 (Blue/Green wire) and vehicle ground. See Figure .
  2. Using ohmmeter, check continuity between control valve terminal No. 2 (Blue/Green wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
  3. If continuity exists, check for power supply voltage at control valve. Turn ignition on. Using DVOM, check for battery voltage at control valve harness connector terminal No. 1 (Green/White wire). If voltage does not exist, inspect and repair power supply circuit. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Turbo Boost (Wastegate) Control Solenoid Valve Inspection -Using ohmmeter, check resistance between control valve terminals. Resistance should be approximately one megohm. Replace control valve if resistance measurement is not within specification. If control valve is okay, substitute ECM with known good unit and retest system.
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