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Electronic EGR System Test

NOTE: The engine temperature sensors must be working properly before performing this test.
  1. With the engine temperature cold and ignition off, connect a voltmeter between Gray wire on EGR solenoid and ground. Start engine. Voltage should read less than 1 volt. This reading should be maintained until normal operating temperature is reached and specified time has elapsed as shown in EGR & THROTTLE CONTROL SPECIFICATIONS  table.
    EGR & THROTTLE CONTROL SPECIFICATIONS

    Application Computer No. Delay (Seconds)
    3.7L
    Fed. 4289058 65
    Calif. 4289061 65
    5.2L
    Fed. 2-Bbl. 4289063 60
    Fed. 4-Bbl. 4145996 60
    Calif. 4289065 60
  2. After normal operating temperature is reached and specified time has elapsed, voltmeter should register charging system voltage. If readings are not obtained as outlined, replace EGR solenoid and repeat test. If the voltmeter indicates charging system voltage before specified time elapses, replace computer.
NOTE: If an engine is restarted while still at normal operating temperature, the voltmeter reading should register 1 volt for the specified time, then register charging system voltage.
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