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Injector Control Circuits (DTC 27)

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-2  .
  1. Using scan tool, erase trouble codes. Attempt to start engine. If necessary, crank engine for at least 10 seconds. Using scan tool, read trouble codes. Allow engine to idle for at least 20 seconds. If scan tool displays any injector control circuit codes, see INJECTOR CONTROL CIRCUIT CODES table and perform corresponding test. If scan tool does not display any injector control circuit codes, go to next step.
    INJECTOR CONTROL CIRCUIT CODES

    Scan Tool Display 3.5L Engine Test No.
    CONTROL CIRCUIT
    INJECTOR NO. 1 TEST TC-29D 
    INJECTOR NO. 2 TEST TC-30C 
    INJECTOR NO. 3 TEST TC-31C 
    INJECTOR NO. 4 TEST TC-32C 
    INJECTOR NO. 5 TEST TC-33C 
    INJECTOR NO. 6 TEST TC-34C 
  2. At this time, the condition required to set trouble code is not present. INJECTOR CONTROL CIRCUIT trouble code sets when Powertrain Control Module (PCM) does not detect injector turn off edge when expected. Possible causes are: open or shorted injector control circuit, open power supply, open injector, or failed driver in PCM.
  3. Inspect wiring and connectors. Repair as required. If wiring and connectors are okay, start engine. Wiggle wiring harness and connectors from injector to PCM. If engine misses or stalls when wiring harness and connectors are wiggled, repair area where wiggling caused problem to appear. If engine does not miss or stall when wiring harness and connectors are wiggled, see INACTIVE TROUBLE CODE CONDITION  . Test is complete.
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