LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 1987 >> Samurai Base >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> System Testing >> EGR System Check >> EGR Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

EGR Valve

  1. Run engine with engine temperature below 131°F (55°C). Ensure that EGR valve diaphragm does not operate. Check by touching diaphragm with finger.
    CAUTION: Wear gloves in case EGR valve is hot.
  2. Warm engine to normal operating temperature. Increase engine speed. Diaphragm should move away from piston side of EGR valve during acceleration. Decelerate engine and check that diaphragm moves toward piston side of EGR valve. See Fig 2 .
    Fig 1: Exhaust Gas Recirculation System
    G67286
    Fig 2: Checking EGR Valve Diaphragm Movement
    G67287
  3. If EGR valve does not function properly, check vacuum hoses for leakage, clogs or deterioration. Test EGR valve using vacuum pump. Connect vacuum pump to 3-Way Solenoid Valve (TWSV) side of EGR valve. Apply 8 in. Hg to EGR valve and check that diaphragm moves smoothly and is held toward side of vacuum pump. See Fig 3 .
  4. If EGR valve tests satisfactorily, check appropriate electronic control module circuits. See ELECTRONIC CONTROLLED EMISSION SYSTEM article.
Fig 3: Testing EGR Valve with Vacuum Pump
G67288
scientia non olet · About LEMON Manuals