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Home >> Dodge and Ram >> 1992 >> Shadow Base, 2D Hatchback, 2.5 K, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.0L >> Fault Code Tests >> Test FC-17A - Injector #1 Control Circuit (DTC 27)

Test FC-17A - Injector #1 Control Circuit (DTC 27)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase fault messages. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
  2. Using DRB-II, read fault messages. If engine started, allow engine to idle for at least 20 seconds. If DRB-II does not display INJECTOR #1 CONTROL CIRCUIT, go to next step. If DRB-II displays INJECTOR #1 CONTROL CIRCUIT, go to step 6).
  3. At this time, condition required to set fault is not present. INJECTOR #1 CONTROL CIRCUIT fault sets if Powertrain Control Module (PCM) does not detect injector "turn off edge" when expected. Possible causes are: open or shorted injector control circuit, open injector power supply circuit, open injector, or failed driver in Powertrain Control Module (PCM). Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform VERIFICATION PROCEDURE VER-2. If no problems are found with wiring and connectors, go to next step.
  5. Start engine. Wiggle wiring harness from injector No. 1 to Powertrain Control Module (PCM). If engine misfires or stalls, repair wiring harness as necessary. Perform VERIFICATION PROCEDURE VER-2. If engine does not misfire or stall, see INACTIVE FAULT CONDITION. Perform VERIFICATION PROCEDURE VER-2.
  6. If DRB-II displayed INJECTOR #1 CONTROL CIRCUIT in step 2), turn ignition off. Disconnect 8-pin injector harness connector. Using an external ohmmeter, check resistance of injector harness connector (injector side) between injector driver No. 1 circuit (White/Dark Blue wire) and Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If resistance is not 10-15 ohms, go to TEST FC-17B.
  7. If resistance is 10-15 ohms, 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 VERIFICATION PROCEDURE VER-2.
  8. If resistance is more than 5 ohms, turn ignition on. Using DRB-II, actuate ASD relay. Place DRB-II in voltmeter mode. Using DRB-II, check voltage of injector harness connector (PCM side), ASD output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform VERIFICATION PROCEDURE VER-2.
  9. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Place DRB-II in ohmmeter mode. Using DRB-II, check resistance of PCM connector terminal No. 16, injector driver No. 1 circuit (White/Dark Blue wire).
  10. If resistance is less than 5 ohms, repair short in White/Dark Blue wire. Perform VERIFICATION PROCEDURE VER-2. If resistance is more than 5 ohms, go to next step.
  11. Using external ohmmeter, check resistance of injector driver No. 1 circuit (White/Dark Blue wire) between PCM connector terminal No. 16 and PCM side of injector harness connector. If resistance is more than 5 ohms, repair open in White/Dark Blue wire. Perform VERIFICATION PROCEDURE VER-2. If resistance is less than 5 ohms, replace PCM. Perform VERIFICATION PROCEDURE VER-2.
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