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Ignition Coil Primary Circuits (DTC 43)

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. Read trouble codes. If scan tool displays any IGNITION COIL PRIMARY CIRCUIT trouble codes, see IGNITION COIL PRIMARY CIRCUIT CODES table and perform corresponding test. If scan tool does not display any injector control circuit codes, go to next step.
    IGNITION COIL PRIMARY CIRCUIT CODES

    Scan Tool Display Test No.
    IGNITION COIL #1 PRIMARY CIRCUIT TEST TC-35B 
    IGNITION COIL #2 PRIMARY CIRCUIT TEST TC-36A 
    IGNITION COIL #3 PRIMARY CIRCUIT TEST TC-37A 
  2. At this time, the condition required to set trouble code is not present. IGNITION COIL PRIMARY CIRCUIT trouble code sets when Powertrain Control Module (PCM) does not see peak current reached. Possible causes are: open or shorted ignition coil driver control circuit, open ignition coil primary circuit, open power supply, or failed PCM. Go to next step.
  3. Inspect wiring and connectors. Repair as required. If wiring and connectors are okay, start engine. Wiggle wiring harness from Direct Ignition System (DIS) coil to PCM. If engine misses or stalls, repair wiring where wiggling caused problem to appear. If engine does not miss or stall, see INACTIVE TROUBLE CODE CONDITION  . Test is complete.
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