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Home >> Lexus >> 1994 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR) System Operation >> Calif.
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Exhaust Gas RECIRCULATION (EGR) System Operation: Calif.

  1. Ensure coolant temperature is less than 127°F (53°C). On SC400 Calif., go to next step. On SC400 except Calif., remove cap and filter from EGR vacuum modulator. See Figure. Clean filter with compressed air. Install filter with coarse side facing upward.
  2. Start engine. Shift transmission into Neutral. Block wheels. Connect Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. See Figure. Run engine at 3500 RPM. See CONNECTING TACHOMETER  under INTRODUCTION. Ensure coolant temperature is less than 127°F (53°C).
  3. While engine is running at 3500 RPM, disconnect jumper wire and observe engine RPM. If engine speed remains steady, go to next step. If engine speed does not remain steady, check for faulty EGR system components.
  4. Ensure engine coolant temperature is at least 131°F (55°C). Reconnect jumper wire between terminals TE1 and E1. While engine is running at 3500 RPM, disconnect jumper wire and observe engine RPM. If engine speed remains steady, EGR system is okay. If engine speed does not remain steady, check for faulty EGR system components.
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