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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-17B - Injector #1 Control Circuit

Test TC-17B - Injector #1 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. Turn ignition off. Disconnect 8-pin injector harness connector. Using an external ohmmeter, check resistance between White/Dark Blue wire and Dark Green/Orange wire on 8-pin injector harness connector (injector side). If resistance is 10-15 ohms, go to next step. If resistance is not 10-15 ohms, go to TEST TC-17C.
  2. Move ohmmeter lead from Dark Green/Orange wire to ground. If resistance is less than 5 ohms, repair short to ground in White/Dark Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  3. Turn ignition on. Using scan tool, actuate ASD relay. Using scan tool in voltmeter mode, check voltage on 8-pin injector harness connector (PCM side) Dark Green/Orange wire. If voltage is less than 10 volts, repair open Dark Green/Orange wire. Perform TEST VER-2. If voltage is more than 10 volts, go to next step.
  4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 16 (Light Blue wire). If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Light Blue wire. Perform TEST VER-2.
  5. Using an external ohmmeter, check resistance of Light Blue wire between PCM connector terminal No. 16 and 8-pin injector harness connector (PCM side). If resistance is more than 5 ohms, repair open Light Blue wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
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