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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Engine Controls - Tests W/Codes - 3.3L Gasoline) >> Self-Diagnostic Tests >> Test TC-20B - Injector #4 Control Circuit

Test TC-20B - Injector #4 Control Circuit

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  section at the end of this article.
  1. It may be necessary to remove intake plenum to access injector connectors. Reconnect 10-pin injector connector. Disconnect injector No. 4 connector. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Put scan tool in voltmeter mode.
  2. Using scan tool, check voltage on injector No. 4 connector Dark Green/Orange wire. If voltage is less than 10 volts, repair open Dark Green/Orange wire. If voltage is more than 10 volts, turn ignition off. Disconnect 10-pin injector connector. Using an external ohmmeter, check resistance of injector driver circuit (Light Blue/Brown wire) between injector No. 4 connector and 10-pin injector connector (injector side).
  3. If resistance is more than 5 ohms, repair open Light Blue/Brown wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace injector. Perform TEST VER-2.
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