GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Ignition Coil Not Operating Properly

Tools Required

J 39200 Digital Multimeter

  1. Remove the ignition Coil. Refer to Ignition Coil and Ignition Coil Module Replacement Ignition Coil and Ignition Coil Module Replacement .

    2. Notice: Do not insert the J 39200 digital multimeter probe into the ignition coil connectors. The female terminals could be deformed, resulting in intermittent operation. Only make contact with the front edge of the terminals.


    Object Number: 43746 Size: SH
  2. Connect an ohmmeter as shown.
    3. • Use the high scale.
    • If the reading is not infinite, replace the coil. Refer to Ignition Coil and Ignition Coil Module Replacement Ignition Coil and Ignition Coil Module Replacement .

    Object Number: 43747 Size: SH
  3. Connect an ohmmeter as shown.
    4. • Use the low scale.
    • The reading should be 0.1 ohms. If not, replace the coil. Refer to Ignition Coil and Ignition Coil Module Replacement Ignition Coil and Ignition Coil Module Replacement .

    Object Number: 43749 Size: SH
  4. Connect an ohmmeter as shown.
    5. • Use the high scale.
    • If the reading is not 5-25k ohms, replace the coil. Refer to Ignition Coil and Ignition Coil Module Replacement Ignition Coil and Ignition Coil Module Replacement .