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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Tests W/Codes - 3.0L) >> Self-Diagnostic Tests >> Test TC-21B - Injector #5 Control Circuit

Test TC-21B - Injector #5 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.
NOTE: It may be necessary to remove intake plenum when performing this procedure.
  1. Reconnect 8-pin injector harness connector. Disconnect injector No. 5 connector. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Place scan tool in voltmeter mode.
  2. Using scan tool, check voltage of injector No. 5 connector Dark Green/Light Blue wire. If voltage is less than 10 volts, repair open Dark Green/Light Blue wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off. Go to next step.
  3. Disconnect 8-pin injector harness connector. Using an external ohmmeter, check resistance of Gray wire between injector No. 5 connector and 8-pin injector harness connector (injector side).
  4. If resistance is more than 5 ohms, repair open Gray wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace injector. Perform TEST VER-2.
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