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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 TC-40A - Injector #4 Control Circuit (DTC 27)

Test TC-40A - Injector #4 Control Circuit (DTC 27)

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 ignition off. Disconnect injector No. 4 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 ohms, turn ignition on.
  2. Using scan tool, actuate injector No. 4. Using scan tool in voltmeter mode, check voltage on injector No. 4 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.
  3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 4 driver circuit (Light Blue/Brown wire) between injector connector (harness side) and PCM connector terminal No. 13. If resistance is more than 5 ohms, repair open White/Light Blue wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 13 (Light Blue/Brown wire). If resistance is less than 5 ohms, repair short to ground in White/Light Blue wire or Light Blue/Brown wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
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