LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2000 >> B2500 SX, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls Trouble Shooting (5 Of 5) >> General Test Index >> Test 13: EGR Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test 13: EGR Valve

TEST 13: EGR VALVE

TEST 13 EGR VALVE
STEP  INSPECTION  ACTION 
1 CHECK EGR VALVE FUNCTION BY APPLYING VACUUM WITH HAND PUMP
  • Disconnect Idle Air Control (IAC) valve connector.
  • Remove and plug the vacuum supply hose to EGR valve.
  • Start engine and run at idle with transmission in NEUTRAL.
  • Observe idle speed.
  • Connect a hand vacuum pump to EGR valve and slowly apply vacuum (17-34 kPa {5-20 in-Hg}).
  • Does idle speed drop more than 100 rpm with vacuum applied and return to normal (+/-25 rpm) after vacuum is removed? 
 Yes EGR valve is OK.
No Replace EGR valve.
See ELECTRICAL COMPONENT LOCATOR .
scientia non olet · About LEMON Manuals