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Home >> Infiniti >> 1993 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR) >> EGR System Check
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EGR System Check

  1. Warm engine to normal operating temperature. Disconnect vacuum line at EGR valve and connect vacuum gauge. Increase engine speed to 2000 RPM. Vacuum should be indicated on gauge.
  2. If vacuum is not indicated, check backpressure transducer and EGRC-solenoid valve. If components are okay, use a DVOM to check voltage at ECM terminal No. 102. With engine idling, voltmeter should read zero volts. At 2000 RPM, voltmeter should indicate battery voltage. See EGR SYSTEM INPUT SIGNALS table. Also check EGRC-solenoid power supply and harness between ECM and EGRC-solenoid for opens or shorts.
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