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Home >> Dodge and Ram >> 1997 >> Caravan Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L >> Trouble Code Tests >> Test TC-20D - Injector No. 2 Control Circuit

Test TC-20D - Injector No. 2 Control Circuit

NOTE: Perform TEST TC-20A before proceeding. Test applies only to 3.3L Compressed Natural Gas (CNG). For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For wiring diagram, see WIRING DIAGRAMS - 3.3L article.
  1. Ensure ignition is off. Disconnect connectors at injector wiring harness. Injector wiring harness is located at end of valve cover, near transaxle oil dipstick tube. Note which side of injector wiring harness connector goes to the injectors and which side goes to the Powertrain Control Module (PCM).
    NOTE: Injector side of injector wiring harness is the male side of injector wiring harness. The PCM side of injector wiring harness side is the female side of the injector wiring harness. Injector side of injector wiring harness slides into the PCM side of injector wiring harness.
  2. Using ohmmeter, check resistance between terminals No. 1 (Dark Green/Orange wire) and No. 4 (Tan wire) on injector side (male side) of injector wiring harness. If resistance is 3-6 ohms, go to next step. If resistance is not 3-6 ohms, perform TEST TC-20E.
  3. Using ohmmeter, check resistance between ground and terminal No. 4 (Tan wire) on injector side (male side) of injector wiring harness. If resistance is less than 5 ohms, repair short to ground on Tan wire to injector No. 2. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  4. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using voltmeter, check voltage at terminal No. 1 (Dark Green/Orange wire) on PCM side (female side) of injector wiring harness.
  5. If voltage cycles from high voltage to low voltage, go to next step. If voltage does not cycle from high voltage to low voltage, repair open circuit in Dark Green/Orange wire between injector No. 2 and Auto Shutdown (ASD) relay. Perform TEST VER-2A. The ASD relay is located in power distribution center at driver's side front corner of engine compartment, near battery.
  6. Turn ignition off. Disconnect connectors from Powertrain Control Module (PCM). The PCM is located between driver's side front fender and power distribution center, near battery.
  7. Using ohmmeter, check resistance between ground and PCM connector terminal No. 17 (Tan wire). If resistance is less than 5 ohms, repair short to ground in Tan wire between PCM and injector No. 2. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  8. Using ohmmeter, check resistance between terminal No. 4 (Tan wire) on PCM side (female side) of injector wiring harness and PCM connector terminal No. 17 (Tan wire). If resistance is 5 ohms or more, repair open circuit in Tan wire between PCM and injector No. 2. Perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A.
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