EGR Control System Test

NOTE: EGR system must pass CONTROL SYSTEM TEST and GAS FLOW TEST to pass BAR 90 FUNCTIONAL TEST.

VISUAL INSPECTION

1. Check condition and routing of vacuum hoses. Refer to Vehicle Emission Control Information (VECI) label, (underhood).
2. Ensure all vacuum hoses and electrical wires are clear of exhaust manifold to prevent deterioration. Due to temperature, vacuum hoses should always be a minimum of three inches from exhaust manifold.


CONTROL SYSTEM TEST

Electric EGR Transducer (EET):

1. Set parking brake, START engine and allow to reach normal operating temperature at idle.
2. Allow engine to idle in neutral for 70 seconds, then quickly accelerate engine rpm to between 2,000 and 3,000 rpm while observing groove on EGR valve stem for movement, (valve should move approximately 3 mm (1/8"). Repeat test several times to verify valve movement.
^ If movement is visible, See EGR Gas Flow Test.
^ If no movement is visible, SEE EGR System Diagnostic Chart.