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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Controls - Tests W/Codes - 3.3L CNG) >> Self-Diagnostic Tests >> Test NTC-4B - Injector #1 Driver Circuit

Test NTC-4B - Injector #1 Driver 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.
  1. Turn engine off. Turn ignition on. Using scan tool, actuate injector No. 1. If injector clicks, release fuel pressure. Replace injector. Perform TEST VER-2. If injector does not click, go to next step.
  2. Disconnect and inspect injector No. 1 connector. Repair as necessary. Perform TEST VER-2. If connector is okay, ensure scan tool is still actuating injector No. 1. Put scan tool in voltmeter mode. Go to next step.
  3. Using scan tool, check voltage on injector connector, Auto Shutdown (ASD) output circuit (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, turn ignition off. Go to next step.
  4. Allow vehicle to reach room temperature. Using an external ohmmeter, check resistance across injector terminals. If resistance is not 3-6 ohms, release fuel pressure. Replace injector. Perform TEST VER-2. If resistance is not 3-6 ohms, go to next step.
  5. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector. Repair connector as necessary. Perform TEST VER-2. If connector is okay, Go to next step.
  6. Using an external ohmmeter, check resistance of injector No. 1 driver circuit between PCM connector terminal No. 16 (Light Blue wire) and FI connector terminal No. 1 (Dark Blue wire).
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