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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-34A - Ignition Coil Primary Circuit (DTC 43)

Test TC-34A - Ignition Coil Primary Circuit (DTC 43)

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. Using scan tool, erase DTCs. Attempt to start engine. If necessary, crank engine for at least 10 seconds. Using scan tool, read DTCs. If scan tool does not display IGNITION COIL PRIMARY CIRCUIT, go to next step. If scan tool displays IGNITION COIL PRIMARY CIRCUIT, go to appropriate test. See IGNITION COIL DTCS table below.
    IGNITION COIL DTCS

    DTC Go To
    IGNITION COIL #1 PRIMARY CIRCUIT TC-34B 
    IGNITION COIL #2 PRIMARY CIRCUIT TC-35A 
    IGNITION COIL #3 PRIMARY CIRCUIT TC-36A 
  2. At this time, condition required to set DTC is not present. IGNITION COIL PRIMARY CIRCUIT DTC sets when Powertrain Control Module (PCM) does not see peak current reached. Possible causes are: open or shorted coil, open or shorted control circuit, open power supply circuit (Dark Green/Orange wire), or failed driver in PCM.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, go to next step.
  4. Start engine. Wiggle wiring harness from Direct Ignition System (DIS) coil pack to PCM. If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see INACTIVE DTC CONDITION  . Perform TEST VER-2.
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