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Home >> Infiniti >> 1998 >> 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 PCM terminal No. 103 (Blue/Black wire) on I30, terminal No. 10 (Blue/Yellow wire) on Q45.
  3. With engine idling, DVOM should read zero volts. At 2000 RPM, DVOM should read battery voltage. See EGR SYSTEM INPUT SIGNALS  table. Also check EGRC solenoid power supply and harness between PCM and EGRC solenoid for open or short circuit.
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