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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Controls - Tests W/Codes - 5.2L Gasoline) >> Self-Diagnostic Tests >> Test TC-26A - Injector #3 Control Circuit

Test TC-26A - Injector #3 Control Circuit

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. 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 diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. Turn ignition off. Disconnect injector No. 3 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
  2. Using scan tool, actuate injector No. 3. Using scan tool in voltmeter mode, check voltage on injector No. 3 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 3 driver circuit (Yellow/White wire) between injector connector (harness side) and PCM connector terminal No. 14. If resistance is more than 5 ohms, repair open Yellow/White wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, check resistance of PCM terminal No. 14 (Yellow/White wire) using scan tool in ohmmeter mode. If resistance is less than 5 ohms, repair short to ground in Yellow/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
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